BRACHTUEA FEOM TORRES STRAITS. 37 



line immediately Leliind it, while a rectangular plate projectiag from the outer edge of 

 the joint forms the floor of the orbit. Faii-ly wide gaps are left between the postocular 

 process and the supra-ocular hood and basal antennal plate in the upper and lower walls 

 of the orbit respectively. Dana's genus is generally regarded as a synoaym of Hj/astcuus, 

 and I have accordingly followed Milue-Edwards in adopting that name for the present 

 form, though it differs considerably in the structure of the orbit from those species of 

 Hifcistemis which I have examined. Prom Acanthuplirijs it appears to differ in the fact 

 that the inner distal corner of the merus of the third maxillipeds is notched, and the 

 structure of the orbital region is very different from that shown in Milne-Edwards's 

 figure of A. cristimanus (Ann. Soc. Ent. France, (Jj) iv. 18(55, \)\. v. fig. 3 a). 



Localiti/. " Murray Island, channel l)etween reefs, 15-20 fath." 



Distribution. " Eastern seas " {Adams 8f JF/iite). 



Naxia SERPiTLiFEKA (Guerin). 



Nuxia serpulifera, Milne-Edwards, Hist. Nat. Crust, i. p. 313; Haswell, Cat. Austr. Crust, p. 21 

 (1882) ; Miers, Hep. Voy. 'Alert/ Crust, p. 19G (1881) ; Pocuck, Aun. Mag. Nat. Hist. (G) v. 

 p. 79 (1890) ; Ortmann, in Semon's Zcol. Forsch. Austral, v., Crust, p. 43 (189-1). 



A large female specimen (83 mm. in length) of this characteristic Australian species 

 is in the collection. 



Localiti/. " Torres Straits." 



Naxia taurtjs, Pocock. 



Naxia tavrus, Pocock, Ann. Mag. Nat. Hist. (G) v. p. 70 (1890); Alcock, Journ. Asiatic Soc. Bengal, 



Ixiv. (2) p. 219 (1895) ; Alcock & Audersou, Illustr. Zool. ' Investigator/ Crust, pi. xxxiii. 



figs. 5-5 a (1898). 

 N. cerastes, Ortmann, Semou's Zool. Forsch. Austral., v. Crust, p. 43, pi. iii. fig. 4 (1894) ; Alcock, 



Journ. Asiatic Soc. Bengal, Ixiv. (2) p. 220 (1895) ; Alcock & Auderson, Illustr. Zool. 



'Investigator,' Crust, pi. xxxiii. figs. 2-2 « (1898). 



Two male specimens, differing from Pocock's type in the much shorter rostral spines 

 —about G-5 mm. in a total length of 17 mm., — with the accessory spinules well in front 

 of the middle of their length. The meral spines, large and conspicuous on the first pair 

 of walking-legs, are all but obsolete on the succeeding pairs. In other respects these 

 individuals do not differ materially from the type specimen. Of the two figures given 

 by Alcock and Anderson our specimens resemble most that named N. cerastes, Avithout 

 agreeing precisely with either. It can hardly be doubted, however, that, as Alcock lias 

 suggested, N'. cerastes is merely a variety of N. tauriis. 



Locality. "Channels between reefs, Mer, 15-20 fath." 



Tylocaecinus STYX (Herbst). 



Pha siyx, ]\Iilne-Ed\vards, Hist. Nat. Crust, i. p. 308. 



Microphrys stijx, A. Milue-Edwards, N. Arch. Mus. Paris, viii. p. 247, pi. xi. fig. 4 (1872). 

 Tylocarcirms styx, Miers, Ann. Mag. Nat. Hist. (5) iv. p. 14(1879); Alcock, Journ. Asiatic Soc. 

 Bengal, Ixiv. (2) p. 235 (1895). 



