520 REV. T. R. R. STEBBIXG ON CRDSTACEAKS [May 22, 



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

 Museum, pp. 52, lc59. 



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

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

 uj^y^'l 19S3- Peltarion magellanicus, Jjucas, Voy. 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. Lond. p. 68. 



1 886. Hypopeltarium spinosulurn, Miers, ' Challenger ' Brachy ura, 

 Eeports, vol. xvii. p. 211. 



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

 p. 4vl. 



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 I5 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. 



Catometopa. 

 Fam, Hymekosomii)^. 



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

 dromus, p. 54). 



This family is more commonly regarded as a subfamily of the 

 Pinnotheridse, called Hynienicinse by Dana, Targioni-Tozzetti, and 

 Haswell, but Hymenosominse by Milne-Edwards and Miers. Of 

 the genera assigned to this group, H ymenosoma Leach is much older 

 than Dana's Hymenicus. In the Hymenosomidse the third joint of 

 the third maxillipeds is not diminutive as in the Pinnotheridse, 



Professor Haswell considers the genera Hymenosoma, J/ymenicus, 

 and Halicarcinus to be synonyms, and inferentially unites with 

 them Elamena Milne-Ed v\ards. For in a note upon " Hymeno- 

 soma 'flanatum" he says: " The Elamena Mathaeioi 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 Mathaei of Desmarest 

 (Consid. p. 163), 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 Mathaei, I am unable to form an opinion — the 

 ' Xrabben des Rotheu Meeres ' not being here [Sydney] obtainable." 



On this it must be remarked that practically there is no disagree- 

 ment between the origiiial account given by Milne-Edwards and 

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

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

 [4i 



