330 On new Sessile-eyed Crnstaceans. 



equal, too;etlier lon.o'er than the first ; the finger is about two 

 thirds as long as the fifth joint, the slender nail being longer 

 than the base. 



The first and second perseopods have the joints shorter and 

 less slender, the first not curved. The hand has a serrate 

 spine on the inner margin near the finger, the preceding joint 

 having a similar spine on the outer apex and a longer spine 

 on the inner. In the last three pairs of pera:!opods the first 

 joint is a little more dilated, the hand has serrate margins, 

 and there is a group of serrate spines at the apex both of this 

 and of the preceding joint ; the finger has a minute instead of 

 an elongate nail. 



The marsupium is composed of eio-ht plates. 



All five pairs of pleopods are well developed in the female, 

 each of the oval rami carrying about thirteen setae, which did 

 not appear to be plumose. 



The uropods have the peduncle about twice as long as 

 broad. The inner ramus consists of two long joints, the first 

 a little longer than the peduncle and the second a little longer 

 than the first ; the first carries three seta3 at the apex, the 

 second five or six, and one on the inner margin a little way 

 above the apex. The outer ramus is narrow, equal in length 

 to the peduncle, the first joint having an apical seta on the 

 outer margin, the second, which is slightly shorter, having 

 two setffi on the apex. 



The length of the animal is about one tenth of an inch. 



Three or four specimens were obtained in August 1890 in 

 the sands at Lee and Woolacombe, North Devon. The 

 species is named in compliment to Professor Lilljeborg, who 

 publislied an important work on the Tanaidfe in L864. 



The species Leptognathia laticaudata, G. 0. Sars, was 

 taken in June this year in the Clyde at Kames Bay, while I 

 was dredging in company with Mr. David Robertson, F.L.S. 

 Tliis species is, it seems, new to the fauna of Great Britain. 



EXPLANATION OF THE PLATES. 



Plate XV. 



Tahrchestia brito, sp. n. gn. \, S, first gnathopod of male; gn. 2, J, 

 second gnathopod of male ; yn. 1, 5 > fii'st guathopod ot female ; 

 gn. 2, $ , second gnathopod of female ; j)rps. 1, 2, 3, 4, last two 

 joints of the first, second, third, and foui-th peraeopods respec- 

 tively ; ur. 3, third uropod ; x, telsou. 



Plate XVI. 



Leptognathia Lilljehorgi, sp. n. Dorsal view of the animal, the natural 

 size indicated by the line above, a. s., upper antenna, three ter- 

 minal joints; «.?'., lower antenna ; /. s., upper lip; wi. «i., parts 



