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Show 520 REV. T. R. R. STEBBING ON CRUSTACEANS [May 22, 1847. Peltarion spinosulum, White, List of Crustacea in British Museum, pp. 52, 139. 1852. Peltarion spiinulosum, Dana, U.S. Expl. Exp. vol. xiii., Crustacea, p. 304, pi. 18. figs. 6 a b. 1853. Peltarion magellanicus^ JJUCSLS, Voy. au Pole Sud, Zoologie, vol. iii. Crustace's, p. 83. 1871. Peltarion spnnulosum, Cunningham, Tr. Linn. Soc. Lond. vol. xxvii. p. 494. 1881. Peltarion spinulosum, Miers, Pr. Zool. Soc. Lond. p. 68. 1886. Hypopeltarium spinosulum, Miers,' Challenger' Brachyura, Eeports, vol. xvii. p. 211. 1893. Hypopeltarion spinulosum, Ortmann, Zool. Jahrb. vol. vii. p. 421. The carapace, except on the hind margin, is entirely begirt with little unequal teeth. W h y they have been called spinules is not easy to explain. They are not movable, but continuous with the carapace which they fringe. A single specimen, about 1^ inch (34 mm.) in length and just the same in breadth, was " found during low-water in sandy bay, Port William," by Mr. Vallentin. Cunningham speaks of it as burrowing in sandy beaches, as well as of its being taken by dredging. C A T O M E T O P A. Fam. HYMENOSOMID^E. 1858. Hymenosomidce, Stimpson, Pr. Acad. Philad. p. 108 (Pro-dromus, p. 54). This family is more commonly regarded as a subfamily of the Pinnotheridae, called Hymenicinae by Dana, Targioni-Tozzetti, and Haswell, but Hymenosominas by Milne-Edwards and Miers. Of the genera assigned to this group, Hymenosoma Leach is much older than Dana's Hymenicus. In the Hymenosoniidfe the third joint of the third maxillipeds is not diminutive as in the Pinnotherida?. Professor Haswell considers the genera Hymenosoma, Hymenicus, and Halicarcinus to be synonyms, and inferentially unites with them Elamena Milne-Edwards. For in a note upon " Hymenosoma planatum " he says : " The Elamena Mathaei of Milne-Edwards (Ann. Sci. Nat. (3 ser.) xx. p. 223, pi. xi. fig. 4, and Hist. Nat. Crust, ii. p. 35) is probably the young male of this species. It is quite distinct from the Hymenosoma 31athaei of Desmarest (Consid. p. 103), which is described as having the form of an equilateral triangle, with the anterior angle (rostrum) a little rounded. As to which of these two species may be Eiippell's Hymenosoma 31athaei, I am unable to form an opinion the ' Krabben des Eothen Meeres ' not being here [Sydney] obtainable." On this it must be remarked that practically there is no disagreement between the original account given by Milne-Edwards and that of Desmarest, since the former in his generic description uses the expression " il a la carapace a peu pres triangulaire." Like |