62 



antennae with the outer ramus very narrow, bisetose. Oral parts normal. 1st 

 pair of legs with the inner ramus scarcely longer than the outer, its terminal 

 joint somewhat exceeding the middle one in length. The 3 succeeding pairs 

 of legs comparatively strongly built, and resembling somewhat in structure 

 those in P. furcata, the inner ramus being rather produced and extending 

 beyond the outer, its 1st joint rather dilated and, as in P. furcata, armed inside 

 near the base with a strong spine, replacing the usual seta, inner edge of the 

 joint beyond the spine densely spinulose; middle joint produced at the end 

 inside to a well developed spiniform process. 2nd basal joint of these legs 

 armed inside with 45 coarse denticles. Last pair of legs of comparatively 

 small size; distal joint oval quadrangular in form and remarkably constricted 

 at the base, inner edge bulging and fringed with long cilia; marginal setae 5 

 in number, the 2 innermost ones rather slender; inner expansion of proximal 

 joint short and broad, with 5 marginal setae. 



Male, as usual, smaller than female and easily recognisable by the 

 distinctly hinged anterior antennae; none of the legs transformed. 



Colour whitish. 



Length of adult female 0.75 mm. 



Remarks. The present form is nearly allied to P. furcata, but of 

 considerably larger size, and moreover at once distinguished by the much more 

 slender and elongated form of the body. It also exhibits some well-marked 

 differences in the structural details, as indicated in the above diagnosis. 



Occurrence. I have found this form not unfrequently at Ris0r in depths 

 ranging from 30 to 60 fathoms, muddy sand. 



51. Pseudameira mixta, G. O. Sars, n. sp. 



(PI. XL). 



Specific Characters. Female. Body of a similar slender form to that 

 of the preceding species, with the anterior division only slightly broader than 

 the posterior. Rostral prominence well marked, but very small, acute. Urosome 

 nearly as long as the anterior division, its last segment of about same size as 

 the preceding one. Caudal rami less produced than in the preceding species, 

 being scarcely longer than the anal segment; apical setae rather slender. Ante- 

 rior antennae still shorter than in the said species and only composed of 6 

 joints, 2nd joint with the outer edge perfectly smooth. Posterior antennae with 

 the outer ramus slightly widening distally and carrying 3 setae, 2 apical and 

 one lateral. 1st pair of legs with the inner ramus distinctly longer than the 



