40 



comparatively small, scarcely longer than the 1st joint of the inner, and 

 biarticulate. Oral parts and natatory legs of normal structure. Last pair of 

 legs with the distal joint oval in form and quite smooth, terminal lobes some- 

 what unequal, the outermost one being placed a little in front of the other 2, 

 which are closely juxtaposed, marginal setas rather slender and exhibiting the 

 usual relation in length; appendicular bristle attached close to the base of the 

 joint and not accompanied by any spinules; inner expansion of proximal joint 

 extending a little beyond the middle of the distal joint and quite smooth inside, 

 apical setae of the usual appearance. Ovisac comparatively small. 



Colour of the living animal not yet ascertained. 



Length of adult female 0.42 mm. 



Remarks. This is the smallest of the known species of the present 

 genus and perhaps also of the whole family Ectinosomidce, and may thereby 

 easily be recognized, though not exhibiting any more prominent peculiarity in 

 its structure. 



Occurrence. Of this dwarfed species also only a solitary female specimen 

 has hitherto come under my notice. It was found in a sample taken at Far- 

 sund, south coast of Norway, from a depth of about 30 fathoms. 



31. Pseudobradya ambigua, G. O. Sars, n. sp. 



(PI. XXV). 



Specific Characters. Female. Body of a rather robust appearance, 

 with the anterior division not at all broader than the posterior and gradually 

 attenuated anteriorly. Cephalic segment exceeding somewhat in length the 

 exposed part of the trunk and greatly contracted in front, terminating in a 

 strongly prominent rostral projection acuminate at the tip. Trunkal segments 

 of about equal size, with the epimeral plates well developed and acutangular 

 behind, each segment exhibiting a transverse row of small spinules in the 

 middle of the back. Urosome unusually massive, equalling in- length about 

 ;i /4 of the anterior division and, seen from above, only slightly narrowed behind, 

 its segments successively diminishing in size and fringed behind with slender 

 and delicate spinules; anal segment rather short and somewhat flattened, pro- 

 jecting behind in the middle into 2 juxtaposed acuminate lappets. Caudal 

 rami very short, being considerably broader than they are long; apical setae 

 not much elongated, but rather strong. Anterior antennae very small, 5-articu- 

 late. Posterior antennae with the inner ramus normally developed; outer ramus 

 comparatively small, 3-articulate, and, as in most other species, very narrow 



