66_ 



the distal one large and conically produced at the end. Posterior antennae 

 with the basal part not subdivided, outer ramus provided with 4 setae, 2 apical 

 and 2 lateral. Mandibular palp comparatively small, with the proximal joint 

 not expanded and without any trace of an outer ramus. 1st pair of legs with 

 the inner ramus only slightly longer than the outer, and having all 3 joints of 

 about equal length; terminal joint of outer ramus with only 2 spines and 2 

 geniculated setae. The 3 succeeding pairs of legs agreeing in structure with 

 those in the type species. Last pair of legs with the distal joint of com- 

 paratively smaller size, oblong oval in form, and having the edges nearly 

 smooth, marginal setae 5 in number; inner expansion of proximal joint rather 

 broad and obtusely truncated at the end, extending beyond the middle of the 

 distal joint; marginal setae rather strong and successively increasing in length 

 outwards. 



Colour whitish grey. 



Length of adult female 0.57 mm. 



Remarks. The present species is unquestionably congeneric with C. 

 exigua, but of considerably larger size and somewhat more slender form of 

 the body, differing moreover somewhat in the structure of the 1st and last 

 pairs of legs, as also in the less perfectly developed mandibular palp. 



Occurrence. A solitary female specimen of this form was obtained 

 last summer (1918) at Hvaler, outside the Christiania Fjord, from a depth of 

 about 6 fathoms. 



54. Cletomesochra nana. G. O. Sars, n. sp. 



(PI. XLIII). 



Specific Characters. Female. Body short and stout, resembling in 

 shape that in the type species. Rostral plate somewhat less prominent than 

 in C. major, but of a very similar form. Urosome much shorter than the 

 anterior division, and of about equal width throughout. Caudal rami small, 

 quadrangular in form, with the inner corner somewhat prominent. Anterior 

 antennae almost exactly of same appearance as in the preceding species. 

 Posterior antennae with the outer ramus slightly widening distally and carrying 

 5 setae, 3 apical and 2 lateral. Mandibular palp with the basal part rather 

 narrow, but having outside a well-marked small joint tipped with a ciliated 

 seta and representing the rudimentary outer ramus. 1st pair of legs with the 

 inner ramus distinctly longer than the outer, its middle joint shorter than either 

 of the other 2, which are of about equal length. The 3 succeeding pairs of 



