239 



antennae with the middle joint of the terminal part very narrow and prolonged, 

 without any setiferous ledge anteriorly, but distinctly subdivided above the 

 middle. Mandibles with the cutting teeth narrow unguiform, palp of moderate 

 size, with the vibratory plate well developed. Maxillae with the masticatory 

 lobes narrowly produced and the 2 joints of the palp nearly equal in length, 

 vibratory plate with only 3 deflexed setae at the base. Legs slender and of a 

 similar structure to that in Bythocythere. Caudal lamellae extremely small, 

 bisetose. Copulative appendages of male comparatively poorly developed. 



Remarks. This genus is evidently somewhat related to Bythocythere, so 

 as properly to be associated with it in the same subfamily, differing however 

 very conspicuously in the general appearance of the shell, as also in the 

 structure of some of the appendages, especially that of the antennae. In ad- 

 dition to the form described below, 3 other species referable to the present 

 genus have been recorded from more southern latitudes. 



132. Pseudocythere caudata, G. O. Sars. 



(PI. CIX, f g. 2). 

 Pseudocythere caudata, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 88. 



Specific Characters. Female. Shell, seen laterally, oval subquadrangular 

 in shape, greatest height quite in front and about equal to half the length, 

 dorsal margin nearly straight and continuous with the anterior edge, sloping 

 gently behind, ventral margin slightly sinuated in the middle and terminating 

 behind in a well-defined corner tipped with a small dentiform projection, 

 anterior extremity broadly rounded off, posterior somewhat obliquely truncated 

 and produced above to a rather prominent protuberance continuous with the 

 dorsal margin, but well defined below; seen dorsally, narrow lancet-shaped, 

 with the greatest width somewhath in front of the middle and not even 

 attaining Va of the length, both extremities narrowly produced and acuminate. 

 Valves of rather firm consistency, but highly pellucid, with the surface smooth 

 and polished and almost bare of hears. Anterior antennae with the distal 

 segment of the basal part scarcely thickened proximally and provided with 2 

 slender setae, one in the middle of the anterior edge, the other at the end 

 behind, the 4 proximal joints of the terminal part successively diminishing in 

 size, last joint almost as long as these joints combined, and extremely narrow, 

 linear in shape. Posterior antennae with the dividing suture of the penultimate 

 joint located at about the end of the upper l /s of the joint, distal part extremely 

 narrow, apical claws of moderate length and nearly equal. Legs very narrow 



