132 



B. Rdberlsonii, but in this case the calceolse are always wholly absent, and 

 replaced by simple bristles (see fig. 1. a 2 <$ -7-). The present species is, more- 

 over, at once distinguished from the former by the dark pigment of the eyes, 

 and by the absolute want of spines on the 1st segment of the urosome. 



Occurrence. - - Of this form only 3 specimens have come under my 

 notice, all of which were adult males. They were found at Sorvser, west 

 coast of Finmark, in a depth of 3 6 fathoms, sandy bottom. 



Distribution. British Isles (Cumbrse), Shetland Isles (Jeffreys), coast 

 of France (Chevreux). 



7. Bathyporeia gracilis, G. 0. Sars, n. sp.. 



(PL 45, fig. 1). 



Body rather slender in form, though not very much compressed. Cepha- 

 lon about the length of the first 2 segments of mesosome combined, truncated 

 in front, the lateral corners obtusely rounded. First pair of coxal plates 

 rather narrow, obtusely pointed at the tip; the 3 succeeding pairs scarcely 

 deeper than the body. Last pair of epimeral plates of metasome regularly 

 rounded at the lateral corners. First segment of urosome very slightly im- 

 pressed dorsally, and having 2 pairs of very small spines, besides 2 anteriorly 

 curved bristles. Eyes imperfectly developed, and not at all visible in alcoholic 

 specimens. Superior antennse with the 1st joint of the peduncle about as 

 long as the other 2 combined; flagellum in female composed of 6, in male of 

 8 articulations; accessory appendage with the terminal joint very small, scarcely 

 exceeding in length l /5 of the basal one, the latter with the inner edge 

 smooth. Inferior antennse in female fully twice as long as the superior, 

 flagellum very slender, about the length of the 2 outer peduncular joints 

 combined, and composed of 8 articulations coarsely spinous at the end anteriorly ; 

 those of male scarcely longer than in female, flagellum composed of 13 arti- 

 culations, the first 5 of which are provided with distinct calceolse. Anterior 

 gnathopoda with the propodos much shorter than the carpus and regularly 

 oval in form. The 3 posterior pairs of pereiopoda much more slender than 

 in any of the other species known; antepenultimate pair with the meral joint 

 but little expanded and scarcely as long as the 2 outer joints combined; the 

 2 last pairs with the carpal and propodal joints very elongate and narrow. 

 Last pair of uropoda with the terminal joint of the outer ramus about equal- 

 ling in length 1 /3 of the basal one and having both edges smooth. Lobes of 

 the telson rather narrow, each with only 4 apical spines and 2 lateral. Co- 

 lour not stated. Length of adult female 6 mm; of male about the same. 



