520 BET. T. E. E. SXEBBING 0> T CRUSTACEANS [May 22, 



1847. Peltarion spinosulum, White, List of Crustacea in British 

 Museum, pp. 52, 139. 



1852. Peltarion spinulopum, Dana, U.S. Expl. Exp. vol. xiii., 

 Crustacea, p. 304, pi. 18. figs. 6 a b. 



1853. Peltarion mayellanicus,Jjucas, Vov. au Pole Sud, Zoologie, 

 vol. iii. Crustaces, p. 83. 



1871. Peltarion spinulosum, Cunningham, Tr. Linn. Soc. Lond. 

 vol. xxvii. p. 494. 



1881. Peltarion spinulosum, Miers, Pr. Zool. Soc. Loud. p. 68. 



1886. Hypopeltarium spinosulum, Miers, ' Challenger ' Brachyura, 

 Eeports, vol. xvii. p. 211. 



1893. Hypopeltarion spinulosum, Ortniann, Zool. Jahrb. vol. vii. 

 p. 4^1. 



The carapace, except on the hind margin, is entirely begirt 

 with little unequal teeth. Why 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. Yallentin. Cunningham speaks of it as 

 burrowing in sandy beaches, as well as of its being taken by 

 dredging. 



Catometopa. 

 Fain. HymenosomidyE. 



1858. Hymenosomidce, Stimpson, Pr. Acad. Philad. p. 108 (Pro- 

 dromus, p. 54). 



This family is more commonly regarded as a subfamily of the 

 Pinnotherida3, called Hymenicinse by Dana, Targioni-Tozzetti, and 

 Haswell, but Hymenosomina? by Milne-Edwards and Miers. Of 

 the genera assigned to this group, Hymenosoma Leach is much older 

 than Dana's Hymenicus. In the Hymenoso'midffl the third joint of 

 the third maxillipeda is not diminutive as in the Pinnotheridsc. 



Professor Haswell considers the genera Hymenosoma, Hymenicus, 

 an,l ffalicarcinus to be synonyms, and inferentially unites with 

 them Mamma Milne-Edwards. For in a note upon " I/ymeno- 

 simui planatum " he says : " The Elamena Mathaei of Milne-Edwards 

 (Ann. Sci. Xat. (3 ser.) xx. p. 223, pi. xi. fig. 4, and Hist. Xat. 

 Crust, ii. p. 35) is probably the young male of this species. It is 

 quite distinct from the Hymenosoma Mathaei 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 Riippell's 

 Hymenosoma Mathaei, 1 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 disagree- 

 ment between the original account given by Milne-Edwards and 

 that of Desmarest, since the former iu his generic description uses 

 the expression " il a la carapace a peu pres triangulaire." Like 



