184 



100. Pseudomolgus dilatatus, G. O. Sars, n. sp. 



(PI. CIV). 



Specific Characters. Female. Body far less slender than in the pre- 

 ceding species, with the anterior division considerably expanded and rounded 

 oval in outline, greatest width equalling half the length of the body (without 

 the caudal rami). Cephalic segment much broader than it is long, and having 

 the edges quite evenly arcuate throughout. Last trunkal segment comparatively 

 broader than in the preceding species. Tail only slightly exceeding half the 

 length of the anterior division; genital segment of moderate size and slightly 

 dilated in front; anal segment but little longer than the preceding one. Caudal 

 rami rather narrow and produced, though not nearly attaining half the length 

 of the remaining part of the tail; seta of outer edge attached about in the 

 middle and somewhat dorsally; apical setae about as in the preceding species. 

 Anterior antennae rather slender, exceeding somewhat the length of the cephalon 

 and, as in the preceding species, composed of 7 well defined joints. Posterior 

 antennae of a still more compact structure than in the preceding species, being 

 scarcely more than half as long as the anterior ones, but very thick; apical claws 

 3 in number, the hindmost one rather thin, almost setiform, the other 2 very 

 large with the distal part strongly hooked. Oral parts nearly agreeing in 

 structure with those in the preceding species. Legs also very similar; those 

 of last pair however comparatively smaller, with the marginal spines less slender. 



Colour not yet ascertained. 



Length of the specimen examined 1.40 mm. 



Male unknown. 



Remafks.The above-described species is evidently congeneric with 

 the preceding one, though easily distinguishable by the much more robust 

 form of the body, as also by the structure of the posterior antennae. It is 

 moreover rather inferior in size. 



Occurrence. A single female specimen of this form was taken, many 

 years ago, in the Romsdal Fjord, near Molde, from a depth of about 100 

 fathoms. 



Gen. 44. Rhinomolgus, G. O. Sars, n. 



Generic Characters. Body cyclopoid in shape, with the anterior division 

 moderately expanded. Cephalon only faintly separated from the 1st trunkal 

 segment, and provided beneath the front with a peculiar mobile rostral lamella. 



