14 



take place, but afterwards become useless or even inconvenient and therefore 

 are biten off by the aid of the strongly developed endopodal lobes of the 

 anterior maxillipeds, which indeed seem to be pretty well adapted for such 

 a purpose. 



Distribution. Kattegat, Skagerak, British Isles, Arctic Ocean: Newfoundland, 

 Greenland, Jan Mayen, Spitsbergen, Franz Joseph Land, Kara Sea, Murman coast. 



4. Philomedes Lilljeborgi, G. O. Sars. 



(PI. VIII) 



Bradycinetus Lilljeborgi, G. O. Sars. Oversigt af Norges marine Osttacoder. Clir. Vid. Selsk. 



Forh. 1865, p. 112. 



Specific Characters. Female. Shell, seen laterally, obtusely subquadrang- 

 ular in outline, greatest height in the middle and about equalling 2 3 of the 

 length, dorsal margin straight in the middle, but abruptly declining both in front and 

 behind, ventral margin only slightly curved, posterior extremity scarcely broader 

 than the anterior, and exerted below to a rather prominent triangular corner; 

 seen dorsally or ventrally, oblong ovate in shape, about twice as long as broad, 

 and having the posterior extremity more pointed than the anterior. Frontal 

 incisure of valves occurring rather far below the longitudinal axis of the shell, 

 and exhibiting a similar shape to that in the preceding species; rostral part 

 however comparatively more prominent and strongly procumbent, being more- 

 over almost transversely truncated at the end, with the upper angle very 

 distinctly marked and the lower produced to a small procurved point; selvage 

 of this part rather broad. Surface of shell smooth and almost quite devoid oi 

 hairs. Eyes, as in the female of the preceding species, imperfectly developed, 

 and scarcely visible in the living animal. Structure of the several limbs very 

 like that in P. globosus. Inner ramus of posterior antennae, however, provided 

 with 2 or 3 additional setae on the anterior edge of the distal joint, and last 

 pair of limbs having a much smaller number of cleaning spines, scarcely ex- 

 ceding 11 on each limb. 



Male of somewhat smaller size than female, and differing from it in a 

 much similar manner to that in the preceding species, the shell being much 

 narrower, oblong in shape, and more abruptly truncated behind, with the 

 lower corner rather prominent. Frontal incisure of valves, as in the male of 

 P. globosus, very shallow, and the rostral part bluntly rounded at the end. 

 Eye large and conspicuous. Limbs transformed in the same manner as in the 

 male of the preceding species. 



Colour of female whitish grey, with a pale yellow tinge. 



