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Show 1884.] CRUSTACEANS F R O M MAURITIUS. 15 Callianassa mauritiana, described in my last notice of the Crustacea received from M . Robillard, differs altogether from C. mar-tensi in the form of the front and larger chelipede (see fig. 2). Callianassa madayassa, Lenz and Richters1, from Madagascar, is at once distinguished by the absence of lateral spinules from the front and the remarkable spinulation of the fingers of the right chelipede from C. martensii, and the form of the terminal segment and uropoda is very different from that of C. mauritiana 2. PEN^EUS MONODON. Penceus monodon, Fabricius, Entom. Syst. Supplementing, p. 408 (1798); M.-Edwards, Hist. Nat. des Crust, ii. p. 416 (1837); S. Bate, Ann. & Mag. Nat. Hist. (ser. 5), viii. p. 178, pi. xii. fig. 5 v.p. (1881). An adult female of very large size was received from M. Robillard at the beginning of the year. If Mr. Spence Bate is right in his synonymical citations as regards this species, it ranges throughout the Oriental Region. SOLENOCERA LUCASII? 1 Solenocera lucasii, S. Bate, Annals & Mag. of Nat. Hist. (ser. 5), viii. p. 185 (1881). I refer to this species with much doubt a small female, which differs from Mr. Spence Bate's diagnosis in the somewhat more numerous and differently disposed teeth of the rostrum ; and to facilitate its future identification (since the original diagnosis is in few words) I subjoin the following description. Mr. S. Bate's type was dredged in 130 fathoms south of New Guinea, and is of much larger size. Carapace nearly smooth, with the cervical and hepatic sutures distinct, and armed with a distinct antennal and a small hepatic spine, and with a small spine (the supraorbital ?) on either side of the rostrum, placed a short distance behind the anterior margin of the carapace. There is no pterygostomian spine. The rostrum is shorter than the eyes (but broken at the tip), ascends very slightly from the base, and is armed above with eight or nine blunt serratures or teeth, whereof the three posterior are placed on the dorsal surface of the carapace and the last is separated by a much wider interval from the rest than these are from one another; there is no median dorsal carina on the carapace behind the last tooth. The eyes are moderately large; ophthalmopod setose at base on its upper surface. The segments of the postabdomen are nearly smooth, the fourth to sixth distinctly longitudinally carinated on the dorsal surface, and the third less distinctly so ; the carina on the sixth segment ends posteriorly in a 1 Abhandl. d. Senckenb. Naturforsch. Gesellschaft. xii. p. 427, figs. 20-23 (1881). 2 The larger chelipede of C. martensi bears a very close resemblance to the mutilated fossil claw from the Trocadero, described and figured by A. Milne- Edwards as C. parisiensis (t. c. p. 99, pi. ii. f. 3 ) ; but C.parisiensis is too imperfectly known to be certainly identified with any recent species of the genus. |