44 G. O. Sars. 



16. Leydigiopsis curvirostris, n. sp. 



(Pl. VIII, figs. 1—11). 

 Specific Characters. — Female. Carapace, 

 seen laterally, rounded quadrangular, greatest height about 

 in the middle and almost equalling the length, dorsal mar- 

 gin evenly arched, and terminating behind in an obtuse cor- 

 ner, ventral slightly protuberant in front of the middle, and 

 passing in an even curve into the posterior one, which 

 ascends someAvhat obliquely forwards. Head slightly pro- 

 cumbent, its dorsal margin forming together with that of the 

 carapace an uninterrupted curve, rostral projection prolonged 

 in quite an extraordinary manner, forming a narrow, string- 

 like process curved abruptly behind, and extending almost 

 to the anterior corner of the carapace, edges of fornix 

 slightly curved. Surface of valves exhibiting near the 

 margin some concentric rows of very faint punctures, lower 

 edges very setous throughout. Eye with distinct crystal- 

 line cones; ocellus about the size of the eye, rounded 

 quadrangular in form. Antenn ulæ rather short, scarcely ex- 

 tending beyond the base of the rostral projection. Antennæ 

 with a dense bunch of hairs on the lower side of the stem, 

 upper ramus shorter than the lower, apical setæ of the latter 

 very unequal, the lowest being extraordinarily prolonged, 

 so as to reach the posterior edge of the carapace. Lip-plate 

 with the lower edge entire. Caudal part very broad and 

 expanded, dorsal edge below the anal orifice well arched, 

 with from 16 to 20 marginal spines on each side, succes- 

 sively increasing in size distally, lower corner broadly rounded 

 and scarcely projecting, supra-anal prominence well marked, 

 caudal claws rather strong, and finely denticulate in their 

 proximal part, basal denticle larger than the others. Male, 



