1909.] FROM THE BAY OF BISCAY. 865 



Biscay, trawled by the ' Hirondelle ' at two closely adjoining 

 stations about 110 miles to the S.E. of the 'Huxley' Station. 

 (Chevreux (10), pp. 65, 171, 172.) 



Distribution. Coast of Norway, 30-300 fms. Boeck (3), p. 504 ; 

 Sars (29), p. 420. 

 Shetland Isles, 40-50 fms. ; bottom deposit, sand. Norman 



as E. helvetice, (21) p. 281. 

 Scotland, W. coast, 10-12 fms. ; bottom — mud, gravel, broken 



shell. Robertson (25), p. 42 ; Scott (31), p. 173. 

 Channel Islands, off G uernsey , 25 fms. Walker & Hornell (41), 



p. 53. 

 Bay of Biscay, 166 & 180 m. ; bottom deposit, muddy sand. 

 Chevreux (10), pp. 65, 171, 172. 

 Bay of Naples. Delia Valle as E. ciispidatus (13), p. 669. 

 Adriatic. Heller as U. bidens, (18) p. 32. 



EusiRUS BiscAYEXSis Bonnier, 1896. (Plate LXXXI. figs. 33-45.) 



1896. Eusirus biscayensis Bonnier (4), pp. 651-653, pi. xxxix. 

 fig. 1. 



7 specimens, one male measuring barely 13 mm., and six females 

 12-13"5 mm. in length. 



The original description was made by Bonnier from one spe- 

 cimen, a mutilated female, to which were lacking the superior 

 antennae (except the 1st joint), the terminal joints of the 5th 

 perteopods, and the 3rd uropods. The description of a species 

 from a single specimen is always a difficult matter, and with the 

 arrival of fresh material, a modifying of the original account 

 becomes necessary. Seven specimens were taken by the ' Huxley' : 

 one male, the first hitherto recorded, and six ovigerous females, 

 all mutilated, as was to be expected from the method of capture, 

 the Agassiz trawl. Two of the specimens, however, retained the 

 antennje and uropods in good condition, but in all, the hinder 

 perseopoda were missing. A curious point is that two of the 

 females have the 2nd gnathopod on the right side abnormal, 

 much smaller than the corresponding gnathopod on the other side. 

 In one the side-plate and 2nd joint are normal, the 5th, 6th and 

 7th joints very small ; but in the other, though the branchial 

 vesicles and incubatory lamellfe are the normal size, both the 2nd 

 and 3rd side-plates are small and malformed, the 2nd gnathopod 

 is much smaller (text-fig. 278, p. 866) and the 1st perseopod is 

 only half the size of the one on the left side. It would almost 

 appear to be due to some injury received while immature, 

 before the development of the incubatory lamellfe. The male is 

 easily distinguished from the female by its more slender form ; 

 by the antennae with their dense fascicles of sensory bristles; the 

 much shorter perseon ; and by the 4th pleon segment (fig. 37), 

 the anterior dorsal depression of which is more marked and the 

 dorsal carina moi-e developed. 



The whole animal (fig. 33) is covered with microscopic spines 

 and fine hairs, these last especially numerous on the pleon. 



