259 



recorded by G. W. Mtiller from the Gulf of Naples under the name of P. 

 angustum is unquestionably the same species. 



Occurrence. Some few specimens of this form were found in the material 

 of P. variabile collected in various places of the Norwegian coast. Norman 

 has recorded it from Lervik, in the outer part of the Hardanger Fjord. 



Distribution. British Isles. 



145. Paradoxostoma obliqvum, G. O. Sars. 



(PI. CXV1I, fig. 2). 

 Paradoxostoma obliqvum, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 97. 



Specific Characters. Female. Shell, seen laterally, irregularly oval or 

 somewhat rhomboid in shape, greatest height in the middle and about equaling 

 half the length, dorsal margin forming a rather bold and quite even arch, 

 ventral very slightly sinuated in front of the middle and gently bowed behind, 

 joining the hind edge without any intervening angle, anterior extremity narrowly 

 rounded, posterior obliquely blunted, with the upper corner considerably pro- 

 duced in the form of an obtuse protuberance well defined above by a distinct 

 sinus of the dorsal margin; seen dorsally oblong oval in outline, with the 

 greatest width somewhat in front of the middle and about equal to Vs of the 

 length, both extremities gradually contracted and nearly equal. Valves rather 

 thin and fragile, with the surface smooth, but clothed everywhere with scattered 

 rather long hairs; marginal zone comparatively broader than in the other known 

 species and crossed by well-marked distant pore-channels. Anterior antennae 

 rather slender, with the 1st joint of the terminal part nearly as long as the 

 distal segment of the basal one, but somewhat shorter than the next joint, 

 last 2 joints combined exceeding half the length of the preceding one. Posterior 

 antennae with the dividing suture of penultimate joint located about in the 

 middle, apical claws very short. Legs of a similar structure to that in the 

 preceding species. 



Male rather smaller than female and having the shell less vaulted above^ 

 Copulative appendages resembling in structure those in P. ensiforme, but with 

 the basal part comparatively broader, and the terminal part exerted to a very 

 thin and sharp point. 



Colour of shell not yet ascertained. 



Length of adult female amounting to 0.90 mm. 



Remarks. Of this form at first only 2 empty shells were known to me; 

 but subsequently I have had the opportunity of examining some perfect speci- 



