__ 77 



coarsely built, the former terminating in a stout conical process turned obliquely 

 inwards, and having outside a scale-like palp edged with coarse spines; the 

 latter imperfectly prehensile, with the distal joint produced at the end into 2 

 coarse spines. The 4 anterior pairs of legs more perfectly developed than in 

 Cryptopodus, the basal part being well defined and biarticnlate; rami compar- 

 atively small, uniarticulate, the outer one simple mucroniform, the inner lamel- 

 liform and provided at the end with 2 seta;; between each pair of these legs a 

 thin connecting plate present, of different form in the different species. Last pair 

 of legs transformed to 2 rather large curved lamellae projecting on each side 

 from the hind end of the trunk, and separated dorsally by a narrow cleft. 

 Ovisacs less produced than in the preceding genus. 



Remarks. This genus was established as early as the year 1860 by v. 

 Beneden, and ought of course to be considered as the type of the present 

 family. It differs conspicuously from the preceding genus, especially as regards 

 the structure of the posterior antennae and the oral parts. Moreover the legs 

 are built on a somewhat different type, and the transformed last pair bear an 

 evident ressemblance to those in some of the Botryllophilidce (Pteropygus, 

 Schizoproctus). A quite peculiar character of this genus is also found in the 

 presence of a well-marked connecting plate between each pair of the 4 anterior 

 pairs of legs. Two species of the present genus have been formerly recorded, 

 viz., E. fiilgens v. Beneden and E. Betencoiirtl Canu. The Norwegian form 

 described below cannot be referred to any of these 2 species. 



27. Enterocola bilamellata, G. O. Sars, n. sp. 



(PI. XXXVI, 1) 



Specific Characters. Female. Body comparatively slender, with the an- 

 terior division almost perfectly cylindrical in shape, being scarcely at all narrowed 

 in front. Cephalic segment nearly as large as the succeeding segment, and 

 terminating in a blunt rostral prominence. Tail nearly attaining in length Vs 

 of the anterior division and rather swollen at the base, being composed of 4 

 well defined segments gradually narrowed behind. Caudal rami about the 

 length of the last 2 segments combined and rather narrow, without any arm- 

 ature whatever. Anterior antennae comparatively small, conical in form, and 

 apparently composed of 4 joints, the 1st much the largest, the last very small, 

 tuberculiform, without any bristles. Posterior antennae with the distal joint 

 remarkably large, forming a recurved oblong or linguiform plate divided at the 

 end into 7 thin setiform appendages of unequal length. Maxilles with a 



11 Crustacea. 



