ISOPODA. 33 



The fifth joint is uniformly shorter than the sixth, which in the fifth pair is con- 

 siderably elongated, being as long, though not as bi'oad, as the third joint. 



The fixed inner branch of the uropods has two or three tubercles on its upper 

 surface ; the outer branch is fringed with setse along the inner margin and has the 

 outer divided into six or seven teeth. 



The colouring (as preserved) is a symmetrical dark-grey mottling on a pale ground. 



The specimen figured was 9 millims. long and 5 millims. broad. The second 

 pleopods showed no trace of a male appendix. 



Numerous examples were obtained at Jokkenpiddi Paar, one in tow-net gathering 

 at Marichcbukaddi, two at Cheval Paar, one in Galle Harbour, and one elsewhere. 



The tuberculation of the dorsal surface is not incapable of being regarded as 

 forming a series of transverse lines, but the general effect produced is that of a 

 striking contrast between longitudinal lines on the telsonic segment and transverse 

 lines on the rest of the body. I name this prettily sculptured species in honour of 

 A. O. Walker, Esq., F.L.S., a carcinological colleague whose cheering friendship I 

 have for many years enjoyed. 



Cilicaea, Leach. 



1818, Cilicaea, Leach, ' Dictionnaire des Sciences Naturelles,' vol. 12, p. 312 (" Ciliate," p. 311). 



1818, Nassa (part), Say, ' Journ. Acad. Sci. Philad.,' vol. 1, p. 182. 



1825, Cilicaea, Desmarest, 'Consid. gen. Crust.,' p. 295 (" Cicilcea," p. 442). 



1829, Cilicaea, Latreii.le, 'Le Regne Animal,' vol. 4, p. 138. 



1836, Cilicaea, Guerix, 'Iconogr. Regne Animal, Crust.,' pi. 30. 



1840, Ncesea (part), Milne-Edwards, 'Hist. Nat. Crust.,' vol. 3, p. 216 ("Nesea," p. 628). 



1853, Nesaea (part), Dana, 'U.S. Expl. Exp.,' vol. 13, p. 749. 



1879, Nesea, G-. M. Thomson, ' Trans. New Zealand Inst.,' vol. 11, p. 234. 



1881, Cilicaea, Haswell, 'Proc. Linn. Soc. N.S. Wales,' vol. 5, p. 475. 



1882, Cilicaea, Haswell, 'Proc. Linn. Soc. N.S. Wales,' vol. 6, p. 1. 

 1882, Ciliccea, Haswell, 'Catal. Australian Crust.,' p. 295. 



1884, Cilicaea, Miers, ' Zool. of the " Alert," ' p. 308. 



1886, Cymodocea, Beddard, '"Challenger" (Isopoda) Reports,' vol. 17, p. 145. 



1891, Cymodocea, Ives, 'Proc. Acad. Sci. Philad.,' pp. 188, 194. 



1899, Cilicaea, H. Richardson, 'Proc. U.S. Nat, Mus.,' vol. 21, pp. 831, 838. 



1900, Cilicaea, II. Richardson, 'The American Naturalist,' vol. 34, No. 399, p. 222. 



1900, Cilicaea, Steering, Willey's 'Zoological Results,' pt. 5, p. 643. 



1901, Cilicaea, H. Richardson, 'Proc. U.S. Nat. Mus.,' vol. 23, pp. 532, 535. 



1902, Cilicea, H. F. Moore, ' Bull. U.S. Fish Comm.,' vol. 20 (for 1900), p. 172. 

 1902, Cilicaea, H. Richardshn, 'Trans. Connect. Acad.,' vol. 11, p. 291. 



1902, Ciliccea, Whitelegge, 'Mem. Australian Mus.,' Mem. 4, p. 265. 



To include the numerous species now assigned to this genus, the following definition 

 is offered : 



Sexual dimorphism conspicuous. Segments of perason devoid of dorsal processes. 

 Telsonic segment with an apical sinus. Maxillipeds with fourth, fifth, and sixth joints 



F 



