1908-1902. No. 18.] CRUSTACEA. 29 



formed spine originating with a broad lamellar base. Last pair of legs, 

 as usual, much smaller than in female, distal joint oval in form and 

 somewhat narrowed towards the end; inner expansion of proximal joint 

 rounded off at the end, and provided with only 2 unequal setaa. 



Length of adult female 0.92 mm. 



Remarks. This species belongs to the section of the genus in 

 which both rami of the 1st pair of legs are distinctly prehensile and 

 built upon a type somewhat similar to that in the genus Dadylopusia. 

 It is, however, quite distinct from any of the known species. In only 

 one of these, A. nasutus, BOECK, are the anterior antennae composed, 

 as in the present species, of 9 articulations; but from this species 

 it differs conspicuously both in the greater length of the outer ramus 

 of the 1st pair of legs, and in the shape of the distal joint of the last 

 pair of legs in the female. 



Occurrence. This well-marked species was found not unfre- 

 quently in 3 of the bottles examined. 



106. Amphiascus minutus (GLAUS). 



Some few specimens of a small Amphiascus, apparently belonging 

 to this species, were found together with the preceding one. 



107. Amphiascus congener, G. 0. SARS, n. sp. 



(PI. VIII, figs. 1-4). 



Specific Characters. Female. Body rather slender, almost 

 cylindrical in form, or only very slightly attenuated behind. Rostrum of 

 moderate size and somewhat obtusely pointed at the tip. Urosome 

 nearly attaining the length of the anterior division, last segment a little 

 shorter than the preceding one. Caudal rami of a similar form to that 

 in A. latifolius, inner medial seta somewhat obliquely dilated at the 

 base and scarcely longer than the urosome. Anterior antennae of mode- 

 rate length and, as usual, composed of 8 articulations, 4th joint longer 

 than 3rd, terminal part not attaining half the length of the proximal 

 one. 1st pair of legs with the rami less pronouncedly prehensile than 

 in A. latifolius and very unequal, the outer one being scarcely more 

 than half as long as the inner, last joint nearly as long as the middle 

 one and armed with 3 claw-like spines, and inside these with 2 genicu- 

 lated setae; inner ramus with the 1st joint long and slender, carrying 

 inside near the end a short seta, the 2 outer joints somewhat unequal 

 in size, the last one being about twice as long as the preceding one and 



