644 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



1840. Nesea (part), Milne-Edwards, Hist. Nat. Crust., vol. 3, p. 218. 



1881. Cilicaea, Haswell, Proc. Linn. Soc. N. S. Wales, vol. 5, p. 475, vol. 6, p. 2. 



1882. Cilicoea, Haswell, Catal. Australian Crust., p. 29.5. 



1886. Cymodocea, Beddard, Challenger Reports, vol. 17, Isopoda, p. 145. 



189.3. Cilicaea, Stebbing, History of Crustacea, p. 364. 



1900. Cilicaea, Harriet Richardson, The American Naturalist, vol. 34, pp. 222, 

 224. 



In a s}Tioptic table of the Sphaeromidae Miss Richardson distinguishes Cilicaea 

 as having 'outer branch of the uropoda not rudimentary,' 'only the external branch 

 of the uropoda projecting and exposed ; outer branch incapable of folding under 

 inner' ; ' all the thoracic segments of equal length. Penultimate abdominal segment 

 in male generally produced in spine. Terminal segment excavated with or without 

 median lobe.' 



If, however, the figures given by Desmarest and Guerin of the t}-pe species 

 can be trusted, that has the first peraeon segment decidedly longer than the others, 

 nor will equality of the peraeon segments apply to any one of the six species 

 described by Professor Haswell. Mr Beddard considers that both Cilicaea and Nesea 

 are synonyms of Cymodoce, but while so little is known as at present about the 

 mouth-organs of the numerous species, speculation as to their generic position seems 

 useless. 



Cilicaea tenuicaudata, Haswell. 



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

 pi. 17, fig. 2. 



1882. Cilicaea tenuicaudata, Haswell, Catal. Australian Crust., p. 295. 



Having had no opportunity of examining any other specimen of this genus it 

 is only provisionally that I assign the solitary one in Dr Willey's collection to 

 Professor Haswell's species. It agrees in almost all respects remarkably well with his 

 description and figures, but under the microscope the tuberculation, especially of the 

 pleon, is scarcely to be called obscure; the first antennae have 10 — 11, and the 

 second 14 — 15, joints in the flagella (whereas Haswell says, flagella of antennae each 

 with about ten articuli) ; and the long ramus of the uropods has the apex oblique, 

 more as in figure of C. crassicaudata, Haswell, not bifurcate as in both figure and 

 description of C. tenuicaudata. The eyes are large and deeply let into the front of 

 the large first segment of the peraeon. The long, apically bifurcate process of the 

 pleon is ventrally clothed with hair or stiff but fine setae. The length, 7'5 mm., 

 agrees nearly with the five-sixteenths of an inch given by Haswell. 



At the tip of one uropod is a little foraminifer. The apices of both uropods 

 and of the pleon process were grouped about this object, as if engaged either in 

 securing it or attempting to dislodge it. In this position the uropods seemed as if 

 they were bifurcate, but not so when separated. 



Habitat. Blanche Bay, New Britain, 40 — 50 fathoms. Taken by trawl. 



