uAMJiAiuu.i!;. 83 



preceding paii-s. and as long as the remaining joints of the 

 appendage. 



lA-ngtli ? 



llah. S. Greenland Sea (Kroyer). 



This description is taken from Kroyer's figure. 



2. Pontoporeia affinis. (Plate XIV. fig. 2.) 



Pontdjxirtna nniiiis, Lituktrom, Ofvers. af Konql. Vetensk. Akad. 

 ForhnmU. p. G^i. 1855. 



Eyes oval. Superior antenna) having the first joint of the peduncle 

 as long as the other two, furnished underneath with plumose 

 haii-s ; flagellum rather longer than the peduncle ; secondary 

 appendage triarticulate. Inferior antennae having the flagellum 

 rather longer than the peduncle ; the fir.st joint much longer 

 than broad, the succeeding six or seven broader than long. Pos- 

 terior pail- of pereiopoda resembling those of P. femorata. Telson 

 cleft, each di^^sion having a rounded apex. 



Length ? 



Hah. Landskrona (?) (Lindstrdm). 



Lindstrom in his description lays mucli stress on the cellular 

 structure of the intenial tissues of the bases and coxa of the posterior 

 pair of pereiopoda ; but this, according to hLs figure, appears only to 

 be the fatty or cellular sti-ucture common to all in the living stat(^, 

 paiticularly when the animal hae but recently moulted. 



9. OPIS. 



Opis, Kroyer, Nat. Tidskr, ser. 1. vol. iv. 



This genus differs from Anonyx in having the first pair of gna- 

 thopoda more perfectly chelate. 



1. Opis typica. (Plate XIV. fig. 3.) 



Opis t^^iica, Kroyer, Nat. Tidskr. sor. 1. vol. iv. ; Voyage en Scand. 

 pi. i7. f. 1. 



I only know the animal from Kroyer's figure and description. In 

 general outline it nearly resembles Anonyx Edwardsii, from which it 

 appears to difi'er only in the generic distinction. 



Kroyer obtained his specimen from HolbiiU, who found it on tlic 

 coast of Greenland. The specimen named Opis typica in the liritisli 

 Museum and in the Catalogue of 1850, as also in Wliito's ' History 

 of the British Crustacea,' is Lysianassa Costce of M. Edwards. 



2. Opis Eschrichtii. (Plate XIV. fig. 4.) 

 Opis Eschrichtii, Kroyer, Nat. Tidskr. vol. iv. p. 149. 



This species appears to diH"er from 0. typica, according to Kroyer's 



o2 



