MARINE CRUSTACEANS. 



XII. ISOPODA, WITH DESCRIPTION OF A NEW GENUS. 

 By the Rev. T. R. R. Stebbing, M.A., F.R.S., Sec. L.S. 

 (With Plates XLIX.— LIII.) 



This small collection of Isopoda was entrusted to me for identification and description 

 by my friend Mr L. A. Borradaile, M.A., F.Z.S., of Selwyn College, Cambridge. Of the 

 fourteen species contained in it eight appear to be new, and for some of those which are 

 not new the collection has supplied information likely to be of service. Especially attention 

 may be called to the opinion expressed about Dana's genus CoraUana, that opinion, if correct, 

 involving the transfer of several species from Dana's genus to a new one named Excorallana. 



FLABELLIFERA. 



Flahellifera, 1882, Sars, Fork. Selsk. Christian., No. 18, p. 15 ; 1893, Stebbing, History of 

 Crustacea, p. 330; 1897, Sars, Crustacea of Norway, Vol. ii. Ft. 3, p. 43; 1901, Harriet Richardson, 

 Proa. U.S. Mus. Vol. xxiii. p. 50.5. 



Sars observes that ' the tribe includes six very distinct families, viz. Anthuridae, 

 Gnathiidae, Cymothoidae, Serolidae, Sphaeromidae, and Limnoriidae ', but of these the third 

 has generally been again subdivided into six families, viz. Aegidae, Cirolanidae, Corallanidae, 

 Alcironidae, Baryhrotidae, and Cymothoidae, thereby increasing the number of families to no 

 less than eleven in all' That the existing classification requires to be slightly modified will 

 be argued in the following pages. The number of the families, however, will not be altered, 

 and species representing six of them will have to be considered. 



Fam. Anthuridae. 



In Willey's Zoological Results, Fart 5, pp. (Jl8 — 620, 1900, I have rather fully discussed 

 the history of this family from its institution by Leach in 1814 to the end of the nineteenth 

 century, and am unwilling therefore to repeat what has been so recently published. 



The resemblance that often exists between some at least of the limbs in species of 

 this family and those in the Cryptoniscus-stage of the Epicaridea is perhaps not unworthy 

 of remark. 



A single specimen, about 6 mm. long, of a species apparently belonging to Anthura or 

 Cyathura, was ' found on the back of a teat-fish at Minikoi.' As the specimen had gone 

 dry, it seemed expedient to wait for further material before attempting to give this form 

 its place in classification. 



G. II. 90 



