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Show 76 CRUSTACEA. . p ASIPH.JEA, sa: v ., Although closely approximated to several of the preceding by the supel'ior antennre which are terminated by two threads; by the form of the four anterio1· feet, terminating in a didactyle forceps, and pre. ceded by a joint, without annular divisions, and by the shortness of the rostrum, differs from them in sever~} respects. A testaceous ap. pendage i~ very evident at the external base of their feet; these latter, with the exception of the claws, which are larger and nearly equal, are very slender and filiform; the body is greatly elongated, strongly compressed, and extremely soft. Pas. sivado; .!llp!teus sivado, Risso, Crust., III, 2; Desmar. Consid., p. 240, is two inches and a half long, and four lines and a half in breadth. The body is transparent, of a nacre white edged with reel, the caudal fin marked with small dots of the same colour. The rostrum is sharp and slightly curved at the point. Claws reddish. · It is very abundant on the shores of Nice and according to Risso spawns in June and July. No other s~ecies has yet been observed. Our fifth and last section of the Macroura, that of the SoHIZOPODA, appears to connect the Macroura with the following order. The feet, none of which terminates in a forceps, are very slender, resem· ~le thongs, a_re furnished with an appendage more or less long, aris· 1~g from their exfernal side near their base, and serving for nata· t10n only. The ova are situated between them and not under the tail. The ocular pedicles are very short. As ln most of the Ma· croura the front projects into a point or rostrum. The shell is thin and the tail terminates, as usual, in a sort of fin. They are small 1 and inhabit salt water. ' ~ere the eyes are very apparent; the lateral antennre are accom· pamed by a scale, and the intermediaries terminated by two threads and composed of several small segments, as in the preceding genera. MYSrs, Latr. .-:nte~nre and feet exposed; the shell elongated; nearly square or ~yhndrical; the eyes closely approximated, and the feet capillary, as 1f formed of two threads( 1 ). (l) My!ia Fabricii, Leach; Encyc. Method., Atl. d'Hist. Nat CCCXXXVI 8 9, Cancer ocu/at u.s, Otl1 .; F a b. , Groenl., fig. 1. See' Desmar., ~on.,s id., p. 241,24' 2.• DECAPODA. 7'1 , CRYPTOPus, Latr . A subovoid inflated shell, curving downwards on the sides, enveloping the body as well as the antenn.-e and feet, exhibiting b~nea~h a mere longitudinal fissure. The eyes are separated, and the .1eet m the form of thongs, with a lateral appendage( 1 ). There the eyes are concealed; the intermediate antennre are coni-cal, inarticulated, and very short; the laterals are compoTsed of .a eduncle, and a thread without any distinct articulations. · here IS . !o-at least'salient-scale at theit· base. Such is tbe MuLcioN, Latr. The body is soft and thorax ovoid. The feet are in the form of a. · thong, and most of them have an appendage at their base; the fo~rtq pair is the longest. • I know but one species, the Mulcion Lesueurii, which was captured by that zealous naturalist in t?e seas of North America. · The late Olivier, in the Pinna marina, found a crustaceous animal very similar at the first coup d'ceil to the Lesueurii but the specimens were so much injured that it is impossible ' I for me to study their characters. The Nebalire, which we at first placed in this section, hav.ing no natatory appendages ·under the last segments of their body, and their feet being tolerably similar to those of a Cyclops, will pass with the Condylura into the order of the Branchiopoda, at the head of which they will stand. The N ebalire, by their very prominent eyes, which seem to be on pedicles, and by some . other characters, appear to connect the Schizopoda with the Branchiopoda. ORDER II. STOMAPODA . The branchire of the Stomapoda are exposed and attached to the five pairs of sub-abdominal appendages, exhibited to us by that part of the body, ca1led tail, in the Decapoda, and which here, as in most of the Macroura, are fitted (1) Cryptoptts Defrancii, Latr., from the Mediterranean. |
