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Show 104 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Mar. 6, Bistribution. Josephine Bank (' Josephine' Exp.); 340-430 fms. Fossil. Pliocene : Coralline Crag, Sutton. 25. TROCHUS DITROPIS, Searles Wood. T. ditropis, S. Wood, Crag Moll. p. 133, t. xiv. f. 9, a-b. 'Porcupine' Exp. 1870: Med. St. Algesiras B., 50. A single sppcimen from each station. Umbilicus small. Bistribution. Palermo (Monterosato) ; about 22 fms. Fossil. Pliocene : Coralline Crag, Sutton. The specimen from Algesiras Bay is sculptured spirally and coarsely, like the Crag specimens ; that from Station 50 is very finely and closely striated lengthwise on the upper part of the body-whorl, besides having the same spiral striae on the rest of the shell. Both these specimens have purplish-brown blotches. Umbilicus very small. Not the very young of T. guttadauri, as might be hastily supposed. I am not disposed to refer the present species to T. bian-gulatus of D'Eichwald ('Lethaea Rossica,' iii., derniere periode, p.226, esp. 199, pi. ix. f. 15, a, b ; 1853), which is very much larger than T. ditropis, and is described as very finely striated in an oblique direction as well as spirally or transversely, and as having a larger umbilicus. E. ZIZIPHINUS, Leach. 26. T R O C H U S M O N T A C U T I , (montagui) W . Wood. T. montagui, W . Wood, Ind. Test. Suppl. pi. 6. f. 43. T. montacuti, B. C. iii. p. 320 ; v. p. 203, pi. lxiii. f. I. ' Lightning' Exp. St. 5. ' Porcupine ' Exp. 1869 : St. 6. 1870 : Atl. Vigo B. Bistribution. British and Belgian coasts to Malta, var. nana, roast of Tunis (' Shearwater' Exp.), Canaries (McAndrew) ; 7- 95 fms. Fossil. Pliocene: Coralline and Red Crag, Antwerp Crag?, S. France, Italy 1, and Rhodes ? T. cyrnaus, Requien, T. tumidulus, Aradas, and T. parvulus, Philippi. T. turyidulus of Broechi is more conical, the whorls are less convex, and the sculpture is finer ; but the present species may be its slightly altered descendant. The umbilicus has occasionally a small perforation. 27. TROCHUS STRIATUS, Linne. T. striatus, L. S.N. p. 1230: B. C. iii. p. 322; v. p. 203, pi. lxiii. f. 2. 'Porcupine' Exp. 1870: Atl. St. Vigo B.; Med. Algesiras B., Adventure Bank. Bistribution. S. England, Ireland, coasts of France, Spain, Portugal, Italy, ^Egean and Archipelago, Adriatic, N. Africa, Madeira, and Canaries ; 0-108 fms. |