ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 629 



1899. Cirolanidae, Hairiet Richardson, Proc. U. S. Mus., vol. 21, p. 822. 



1900. Cirolanidae, Harriet Richardson, The Ameiican Naturalist, vol. 34, p. 215. 



Hansen in 1890 included in this family Leach's three genera Cirolana, Gonilera 

 and Eurydice, together with Batltynomus A. Milne-Edwards, and Anuropus Beddard, 

 for the latter of which in 1893 I suggested a separate family Anuropidae. To the 

 Cirolanidae has since been added the genus Cirolanides, Benedict, from ft-esh water, 

 and I am now proposing a new genus Hansenolana. 



Gen. Cirolana, Leach. 



1818. Cirolana, Leach, Diet. Sci Nat., vol. 12, p. 347. 



1840. Cirolana, Milne -Ed wards, Hist. Nat. Crust., vol. 3, p. 235. 



1867. Cirolana, Bate and Westwood, Brit. Sess. Crust., vol. 2, p. 294. 



1890. Cirolana, Hansen, Vid. Selsk. Skr., Ser. 6, v. 3, pp. 318, etc. 



1893. Cirolana, Stebbing, History of Crustacea, Internat. Sci. Sen, vol. 74, p. 342. 



1897. Cirolana, Sars, Crustacea of Norway, vol. 2, p. 69. 



1899. Cirolana, H. Richardson, Proc. U. S. Mus., vol. 21, p. 822. 



1900. Cirolana, H. Richardson, The American Naturalist, vol. 34, p. 215. 



Many additional references will be found in the works above cited. 



Cirolana pleonastica, n. sp. 

 Plate LXVII A. 



This species is most nearly allied to Hansen's Cirolana sulcata from the Cape 

 of Good Hope, but well distinguished from that species by the different sculpturing 

 of the pleon, and by the setose surface of the outer ramus of the uropods. 



First segment of the peraeon considerably the longest ; all the peraeon segments 



marbled with brown spots, which above the hind margin form a transverse row, 



but with a clear central space running lengthwise ; last four pairs of side-plates 



strongly sulcate, last two a little produced, subacute. First segment of pleon concealed; 



sides of fourth with obtuse corners completely overlapping but not concealing those 



of the fifth. Terminal caudal plate triangular, from the middle fringed with plumose 



setae, eight spines encircling the rounded or almost truncate apex ; down the centre, 



producing a sulcate appearance, are four to five pairs of processes successively smaller; 



a dark centre gives the process the look of a tooth, but on nearer inspection it is 



found to be ovate, projected backward. Similar processes are found, twelve in number 



but minute, above the hind margin of the last peraeon segment, and in a similar 



position but not quite so small, to the number of nine on the fourth, and of seven 



on the fifth pemeon segment. In profile the hinder portion of the animal has a 



somewhat serrate outline. 



83—2 



