1898-1902. No. 18.1 CRUSTACEA. 27 



some of which are rather coarse and spinulose at the edges, terminal 

 part 3-articulate and scarcely longer than the 2 preceding joints com- 

 bined. Posterior antennae of a similar structure to that in the type species. 

 Mandibular palp, however, less fully developed, with the rami shorter, 

 none of the seise of the outer ramus spiniform. Posterior maxillipeds 

 rather strong, with an oblique series of small spinules crossing the base 

 of the hand. 1st pair of legs built on the same type as in /. forficata 

 PHILIPPI, though having the 1st joint of the inner ramus less dilated 

 and the outer 2 joints more produced, exceeding, when combined, half 

 the length of the 1st. Natatory legs scarcely different in structure from 

 those in the type species. Last pair of legs, however, rather unlike, 

 distal joint confluent at the base with the proximal one and broadly 

 rounded at the end, marginal seise 5 in number, the 2 outermost re- 

 markably strong and curved, spiniform, and edged outside with coarse 

 cilia, the other 3 setae long and slender; inner expansion of proximal 

 joint extending as far as the distal joint and obtusely truncated at the 

 end, carrying 5 rather unequal setae, the outermost but one very long 

 and slender, the innermost but one quite short. Ovisac comparatively 

 large, extending far beyond the tip of the caudal rami, and oval in form. 



Length of adult female 0.66 mm. 



Remarks. - This is certainly not a Dactylopusia, as believed by 

 TH. SCOTT, but seems to me more properly to be referable to the genus 

 Idomene of PHILIPPI, though differing from the type species, /. forficata 

 rather conspicuously in some points, especially as regards the structure 

 of the mandibular palp, the last pair of legs and the caudal setae. 



Occurrence. A solitary female specimen of this form was 



found in a bottle of specimens taken on July 18, 1901, at the mouth 

 of Gaase Fjord from a depth of about 60 m. 



Distribution. -- Scottish coast (SCOTT). 



102. Amenophia peltata, BOECK. 



Some few specimens of this easily recognizable form occurred in 3 

 of the bottles examined. 



103. Westwoodia assimilis, G. 0. SARS. 



A solitary specimen of a moderately large Westwoodia, which 

 according to the distinctly bi-articulate outer ramus of the 1st pair of 

 legs, must be referred to the above species described by the present 

 author from the Norwegian coast, was found in a bottle of specimens 

 taken on July 12, 1900, in the bay at Land's End. 



