30 G. 0. SARS. [SEC. ARC. EXP. FRAM 



armed at the ti|> with a slender claw and a still longer seta accom- 

 panied liy a small bristle. Natatory legs normal. Last pair of legs of 

 moderate size, distal joint obovate in form, with (> not very long mar- 

 ginal setae; inner expansion of proximal joint triangular, and scarcely 

 extending to the middle of the distal joint, marginal seta? 5 in number. 



Length of adult female 0.87 mm. 



Hem arks. In its general form this species somewhat resembles 

 .1. xi in Hi* (GLAUS). It is. however, of smaller size and moreover differs 

 o'li.-picuously in the structure of the first and last pairs of legs. 



Occurrence. Some few specimens of this form occurred in a 

 buttle of specimens taken on July 30, 1900 (the exact locality not indicated). 



108. Amphiascus polaris, G. 0. SARS, n. sp. 

 (PI. VIII. figs. 5-10). 



Specific Characters. Female. Body less slender than 



in the preceding species and of nearly uniform width throughout. 

 Rostrum considerably prominent and exserted to a very acute point. 

 Urosome not attaining the length of the anterior division, last segment 

 scarcely shorter than the preceding one, and deeply incised behind. 

 Caudal rami short and rather distant, inner medial seta slightly dilated 

 at the base and nearly twice as long as the urosome. Anterior an- 

 tennas rather slender, 8-articulate, with the 4th joint much longer than 

 !nl. terminal part about equalling in length those joints combined. 

 1st pair of legs with the rami very unequal, the outer one scarcely 

 exceeding half the length of the inner, and having all 3 joints of about 

 e<|iial size, the last one, as in A. congener, armed with 3 spines and 

 2 geniculated setas; inner ramns with the 1st joint very slender and 

 ^lightly curved, seta attached inside its end unusually long, outer 2 

 joints very unequal, the last one being almost 3 times as long as the 

 other and linear in form, carrying on the tip a slender, evenly curved 

 claw and a still longer seta accompanied by a small bristle. Natatory 

 legs with tin' rami more slender than in the preceding species, other- 

 wise of normal structure. Last pair of legs somewhat resembling tho-e 

 in A. congener, distal joint, however, less dilated, and oblong m form; 

 inner expansion of proximal joint extending to about the middle of the 

 distal joint, and having the 2 innermost setae comparatively short and 

 spiniform. <)vi-ars oblong oval in form, and containing only a limited 

 number of ova. 



Male with the inner ram us of 2nd pair of legs transformed in the 

 n.-ual manner, the 2 outer joints, being wholly coalesced, outer edge 



