48 



claws long and slender, 4 in number, the foremost one being somewhat shorter 

 than the others. Mandibular palp with the branchial appendage well defined, 

 though not of very large size. Palps of maxillipeds in female rather slender, 

 with the middle joint narrow linear, last joint small and tipped with a slender 

 claw-like spine accompanied by 2 small bristles; those in male of moderate 

 size and nearly equal. Anterior legs with a single slender claw on the tip. 

 Posterior legs with the penultimate joint very movably articulated to the 

 preceding joint, both distinctly serrate on the outer edge, last joint very small, 

 with the apical setse rather unequal, one of them being much more slender 

 than the others and exceeding considerably in length the pectinate seta. 

 Caudal rami well developed and somewhat exerted at the end, dorsal 

 edge of each ramus provided wit 3 slender setae, 2 of them placed close 

 together in about the middle, the 3rd in close approximation to the apical 

 claws. Ovarial tubes forming in the posterior part of the valves a sigmoid 

 curve. Spermatic vessels extending more or less forwards along the ventral 

 side of the valves, in some cases (according to G. W. Muller) forming a dense 

 spiral coil in their anterior part. 



Remarks. This genus was established in the year 1865 by the present 

 anthor, to include 3 species found off the Norwegian coast. 2 of these species 

 have however subsequently been removed by G. W. Muller and placed within a 

 new nearly-allied genus, Erythrocypris, the species recorded by me as P. trigonella 

 being considered by him as the type of the present genus. No less than 12 

 Mediterranean species referable to this genus have been recorded by G. W. 

 Muller, all of them closely related to the northern form described below. 



1. Pontocypris trigonella, G. O. Sars. 



(PI. XX). 

 Pontocypris trigonella, G. O. Sars, Oversigt av Norges marine Ostracoder, p. 16. 



Specific Characters. Female. Shell, seen laterally, pronouncedly trigom 

 in shape and somewhat narrowed behind, greatest height a little in front of 

 the middle and nearly attaining half the length, dorsal margin gibbously arched 

 in front of the middle and sloping rather steeply behind, ventral margin scarcely 

 at all sinuated, anterior extremity evenly rounded, posterior gradually tapered 

 and obtuse at the tip; seen dorsally, oblong oval in outline, with the greatest 

 width in front of the middle and about equal to 2 /5 of the length. Surface of 

 shell smooth and polished and rather densely covered with fine, mostly recurvec 



