520 BET. T. B. H. STEBBOG OS CKCSTACEANS [May 22, 



1847. Peltarion spinosidum, AVhite, List of Crustacea in British 

 Museum, pp. 52, 139. 



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

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



1853. Peltarion magellanicu3,~Lucas, Voy. au Pole Sud, Zoologie, 

 vol. iii. Crustaces, p. 83. 



1871. Peltarion spnmdosum, 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. 421j 



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 lg inch (34 mm.) in length and just 

 the same in breadth, was " found during low-water in sandy bay, 

 Port William," by Mr. Tallentin. Cunningham speaks of it as 

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

 dredging. 



Catometopa. 

 Earn. Hy31enosomid.e. 



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 Hymenieinae by Dana, Targioni-Tozzetti, and 

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

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

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

 the third maxillipeds is not diminutive as in the Pinnotheridae. 



Professor Haswell considers the genera Rymenosoma, Hymenicus, 

 and ffalicarcinus to be synonyms, and inferentially unites with 

 them Elamena Milne-Edwards. Eor in a note upon " Hymeno- 

 soma planatum " he says : " The Elamena Mathaei of Milne-Ed tv ards 

 (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 Eiippell's 

 Hijmenosoma Mathaei, I am unable to form an opinion — the 

 ' Krabbeu des Eotbeu 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 in his generic description uses 

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



