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Show MOLLUSCA. 422 \ t th 0 f t 11 e 11 'ln ge is better marked than in the of its edges; but t 1 e 00 f 1. t spines are frequently observed Ranges o sa ten z preceding genus. 11 They are found in sand, among oo. on the hind part of the she • phytes, &c. . duces a small species( 1 ). The North sea pt o SoLEN, Lin. b' lve oblong or e longated ' but the hinge always The shell only 1 v.a ' ll marked teeth, and the ligament ex-furnished with sahent and we ternal. In the SoLEN, Cuv., s 1 roperly so ca1 1 e d , the shell is cylindrically cla.n - Or the o ens P h . each valve near the antenor g 0 or three teet m . . b ated and has tw . The latter 1s comc.al, and ena les ' . 1 . the foot tssues. . extremtty, w 1et e . d hich it excavates wtth con· . l to bury itself m the san ' w the amma . . on the approach of danger. siderable raptdlty . f d . long the coast of France(2). 1 ectes are oun a . Severa sp . ·n which the teeth approxt· d. . · sh those spec1es l We might tstmgUl , .11 have a long and narrow :mate to t h e m iddle·' some of them ::,tl shell(3). . 'd d shortet" their foot is extremely thick. I thers it lS Wl er an ' I n ° Two of the 1a t t er l' nhabit the Mediterranean( 4). n SANGUINOLARIA, Lam.' . · arly the same as m. the wide Soleus, and has two The hmge IS ne 1 • b t the two latter, which at'e ova1l . · ddlc of each va ve, u l'k teeth m the nu · · , here they merely gape, It are muc h c loser at the two extrenuucs, w certain Mactrre( 5). PsAMMOBIA, Lam. The Psammobire (l .tffer from the Sanguinolarire, in having but a rr • 51 52 or Mya arctica, Fabr., Gran!., · t L Chemn. ' , " 1 (1) Solen mtnu us, ., ' .' ' ' jiente Bose, Coq. l If 'XXI·, 1'· - wh1. ch appeat.s t o be the same as the Htat. a une ' the Hiat. ci deux fentes, Id., lb., 2.. 26 <JS·-S siliqua, lb., 29;-S. emiJ, Jb., (2) Solen vagina, Chemn., Vl, lV, -N ' ". . lb " 35·-S. cultellu.~, lb., ,)7. 30;-S. maxtmus, . ' ' ' "2 34 (3) Solen leu·umen, Chemn., VI, v, " ' · S d' t 8 Id v 38-40;-& o- · 41 4"·- ,.a tau, ., ' (4) Solen strigilatus, Chemn., VI, Vl, ' j' •• Id vii 60. These two . . b "1·-S coarctatus, vi, 45 ;-S. vesperttnus, ·•. ' mtn.t m. us, I ., b" • me· the genus 8 ofM de Blainv11le. OLJ.:CURTE • diVlsLOns have eco .. 56·-S. roseus, lb., 55. (5) Solen sanguinolentus, Chemn.' VI, vu, ' ACEPHALA TESTACEA. 423 single tooth in the middle or one valve, which penetrates between two on the opposite one( 1 ). PsAMMOTHEA, Lam. But a single tooth to each valve; otherwise resembling the Psammobire( 2). The Pbolades have two broad valves, convex towards the mouth, nal'l'OW and elongated on the opposite side, and leaving a large oblique opening at each extremity; their hinge, like that of a true Mya, is furnished with a plate projecting from one valve into the other, and with an internal ligament running from that plate into a corresponding cavity. Their mantle is reflected externally upon the hinge, where it sometimes contains two or three supernumerary calcareous bodies. The foot issues through the aperture on the side next to the mouth, where it is widest, and from the opposite one project the two tubes, which are united and susceptible of inflation in every direction. The Pholades inhabit canals which they excavate, some in ooze and others in stone, like the Lithodomi, Petricolre, &c. They are much sought for on account of their agreeable flavour. Several species are found on the coast of Ft·ance: such is the Dail commun; Pholas dactylus, L.; Chemn., VIII, ci, 859(3). TEREDo, Lin. The mantle extended in a tube much longer than the two small, rhomboidal Yalves, and terminated by two short tubes, the base of which is furnished on each side with a stony and movable kind of operculum or palette. These Acephala, while quite young, pene- (1) Tellina gari, L., Poli, 15, 23;-Solen vespertinus, Chemn., VI, 7, 59;Psammobia maculosa, Lam.? Egyp., Coq. pl. 8, f. 1; Paamm. elongata, Lam., Egyp., pl. 8, f. 2. (2) Psammotheaviolacea, Lam., &c. N.B. These two genera are united in one by M. de Blain ville~ called PsAM:Mo· cou. On the whole, they differ but very slightly from the Sanguinolaria:. Great care is requisite in studying the shell, as the teeth are generally broken. (3) Add Pholas orienta/is, lb., 860, which is, perhaps, a mere variety of dactyltM, ·-Phol. costata, lb., 863;-Phol. crispata, Id., cii, 872, 874;-Phol.pUBilla,lb., 867, 871;-Phol. striata, lb., 864, 866. |