34 ISOPODA. 



1899, p. 332. It is Tanais tomentosus of Kroyer and Sars ; 

 T. vittatus, Rathke and auct. ; but not T. Cavolinii o G. O. 

 Sars's Mediterranean monograph. 



Ilfracombe (A. M. N.} ; piles on shore at Torbay Abbey 

 and at Salcombe (Stebbing); Folperro (Laughrin, fide Bate). 



TANAIS DULONGII (Audouin). 



1866. Tanais Dulongii, Bate & Westwood, vol. ii. p. 129. 



" The only individuals which we have seen were sent to us 

 from Polperro by Mr. Laughrin" (Bate &f Westwood). 



LEPTOCHELIA DUBIA (Kroyer). 



1886. Leptochelin algicola, G. O. Sars, " Middelliavets Saxipoder 

 (Isopoda Chelifera)," Arch, for Math, og Naturvid. Christiania, 

 1886, p. 317, pis. x., xi. 



For full synonymy see Norman's paper previously referred 

 to. It is Paratanais algicola of Harger, and Tanais Savignii 

 of Dohrn (but not of Kroyer). 



Falmouth Harbour, 1884, and Plymouth Sound, 1903 

 (A. M. N.). 



Genus TANAISSUS, gen. nov. 



General form much elongated, especially the cephalosome, 

 which is also constricted anteriorly in $ , and much more so 

 in c? . Antennules in ? four-jointed ; the first joint very long, 

 the terminal joint microscopic. Antennae very short, shorter 

 than the basal joint of the antennules. No eyes. Maxilla? 

 strongly curved distally. Maxillipeds having the penultimate 

 joint without spines or setse, twice as long as terminal joint. 

 Gnathopods in ? of ordinary character, but in <$ the 

 propodos widens greatly at the extremity, forming a broad 

 transverse palm. Uropods with the inner, as well as the 

 outer, ramus few-jointed. 



TANAISSUS LILLJEBORGII (Stebbing). (PI. I. figs. 1-7.) 



1891. Leptoc/nathia Lilljeboryii, Stebbing, " Sessile-Eyed Crustacea," 

 Ann. & Mag. Nat. Hist. ser. 6, vol. viii. p. 328, pi. xvi. 



Female. Cephalosome narrowed in front, but much more 

 so throughout the greater part of its length in the male. The 

 first segment of mesosome is the shortest, the following four- 

 are subequal in length. The antennules are four-jointed ; 

 the first joint longer than the combined length of the rest, the 

 last joint quite microscopic. The antennae are remarkable 

 on account of their not even reaching the end of the 



