with the outer ramus more than twice as long as the inner, and having a well- 

 developed seta inside the middle joint, inner ramus without any seta inside the 

 1st joint, that of 4th pair distinctly 3-articulate. Last pair of legs with the distal 

 joint well defined and broadly oval in form, with 5 thin setae issuing from the 

 somewhat obliquely truncated apex; inner expansion of proximal joint only slightly 

 produced, and carrying 4 slender setae. Ovisac oval, flattened, and containing only 

 a limited number of ova. 



Male differing only slightly from female, though having the anterior an- 

 tennae transformed in the usual manner. 



Colour not yet ascertained. 



Length of adult female 0.86 mm. 



Remarks. This form was first described by A. Scott in the above-quoted 

 paper, and was erroneously referred by him to the genus Normanella of Brady, 

 to which genus it in reality has only a very remote affinity. On the other hand, 

 it is evidently closely allied to Mesochra Macintoshi of Th. Scott, though apparently 

 specifically distinct. 



Occurrence. Several specimens of this form were found in samples taken last 

 summer at Korshavn from a depth of from 30 to 50 fathoms, coarse sandy bottom. 



Distribution. Liverpool Bay (A. Scott), Scottish coast (T. Scott). 



Leptomesochra tenuieornis, G. 0. Sars, n. sp. 



(Suppl. PI. 42). 



Specific Characters. Female. Body somewhat less slender than in the 

 preceding species, though of a similar narrow cylindrical form. Cephalic segment 

 slightly exceeding in length the 2 succeeding segments combined; rostral pro- 

 jection almost obsolete. Urosome not attaining the length of the anterior 

 division and slightly tapered behind, with the segments minutely spinulose at the 

 hind edges ventrally, last segment much smaller than the preceding one. Caudal 

 rami short, being scarcely longer than they are broad, apical setae rather elongated, 

 the inner medial one exceeding 2 /s of the length of the body and somewhat 

 thickened in its proximal part, outer medial seta very distinctly spinulose outside. 

 Anterior antennae exceedingly slender, being about twice as long as the cephalic 

 segment, and composed of only 7 joints, 3rd joint longer than either of the 2 

 preceding joints and more than twice the length of the 4th, terminal part not 

 attaining half the length of the proximal. Posterior antennae with the outer 

 ramus comparatively larger than in the preceding species, biarticulate, with 3 

 thickish setae, 2 of them issuing from the small distal joint. Mandibular palp 

 1 ss fully developed than in the preceding species and without any trace of an 



