TSOPODA. 23 



distinguished by their pectinate character. The genital papilla* on the ventral side 

 of the last perseon segment are short and broad. 



In the tirst pleopods the sinuous inner margin of the peduncle carries seven coupling 

 .spines and as many plumose seta-. The outer branch, as in the following pairs, is 

 fringed round most of its margin with plumose setae. The inner branch in tins and 

 the next pair has a fringe of seta' on the lower half of the inner margin and on tin' 

 apical holder. The second pair are distinguished by the extraordinary length of the 

 slender male appendix, which is twice as long as the trunk of the supporting branch. 



The uropods have the inner apex of the peduncle greatly produced into an acute 

 process, of which the inner margin is setose. The broad inner ramus is mostly fringed 

 with plumose setae and carries eleven spines in the serrate part of its margin. The 

 shorter and much narrower outer ramus is fringed also with plumose seta? and carries 

 nine spines. 



Length 14 millims.. breadth about G millims. 



Locality : The single specimen, a male, was taken in " deep water off Galle." 



A specimen Avhich I deem to be the female or a younger form of the foregoing was 

 " dredged off Mutwal Island,'' and measured 12 millims. in length, with a width of 

 about 4 - 5 millims. It is devoid of the frontal process of the head, and the first 

 perseon segment is without the two submedian dorsal processes. The last three 

 segments of the peraeon more decidedly surpass in length the preceding three 

 segments than in the form already described; the first antenna? have twelve and the 

 second antenna? have twenty-six joints to the fiagellum. The peculiar process of the 

 w rist in the second gnathopod and first perseopod is wanting. No male appendix 

 could be discerned in the (undissected) pleon. Otherwise the agreement of the two 

 specimens is extremely close. The remarkable eyes are alike in both, and though 

 they agree with those of Rociuela vigilans, Haswell, that much larger species, if the 

 figure of the maxillipeds can lie trusted, must lie generically distinct. The tenacitv 

 with which some of the mouth parts in this and kindred species cling together makes 

 satisfactory dissection difficult. But there is little reason to doubt that the frontal 

 lamina, epistome, and rounded membranaceous upper lip figured from the second 

 specimen would equally well represent those parts in the first, had they there been in 

 a condition for figuring. Mga cyclops. Haswkll, is described as Inning the eyes 

 confluent, the telsonic segment sub-triangular. 



Rociuela, Leach. 



1616, Rocinela, Leach, 'Diet. Sci. Nat.,' vol. 12, p. 349 ("BocinMe," p. 348). 



1625, Rocinela, Desmarest, 'Consid. gen. Crust.,' p. 301. 



1S40, Acherusia, Li van, Explor. Algerie, Crust.,' p. 78. 



1867, Rocinela, Bate and WESTWOOD, ' Brit. Sessile-eyed Crust.,' part 18, vol. 2, p. 289. 



1879, Rocinela, ScmODTE ami Meinert, ' Naturhist. Tidsskr.,' ser. 3, vol. 12, p. 380. 



1860, Rocinela, Haswell, 'Proc. Linn. Soc. N. S. Wales,' vol. 5, p. 472. 



1663. Rocinela, Hargek, 'Bull. Mus. Conip. Zool.,' vol. 9, art. 23, p. 97. 



