262 



smaller size and differs moreover conspicuously in the general shape of 

 the shell. The form recorded by G. W. Miiller fiom the Gulf of Naples 

 under the name of P. rotundatum I am unable to distinguish from the 

 present species. 



Occurrence. Some few specimens of this form, all of the female sex, were 

 found in my material of Paradoxostoma, the exact locality not being noted. 



Distribution. British Isles, Mediterranean. 



148. Paradoxostoma pulchellum, G. O. Sars. 



(PI. CXVIII, fig. 3). 

 Paradoxostoma pulchellum, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 95. 



Specific Characters. Female. Shell much compressed, seen laterally, 

 oval or more properly semilunar in shape, greatest height in the middle and 

 about equal to half the length, dorsal margin forming a bold and quite even 

 curve throughout sloping somewhat more steeply behind than in front, ventral 

 margin almost straight, both extremities somewhat deflexed and in quite the 

 same manner obliquely rounded off at the end; seen dorsally, very narrow 

 lancet-shaped, with the greatest width a little in front of the middle and not 

 even attaining 1 U of the length, extremities narrowly contracted and pointed, 

 in particular the anterior one. Valves rather thin, with the surface perfectly 

 smooth and shining; inner duplicatures comparatively broad. Anterior antennae 

 moderately slender, with the 1st joint of the terminal part somewhat longer 

 than the 2nd. Posterior antennae with the distal part very narrow and pro- 

 longed, dividing suture of penultimate joint located somewhat below the middle, 

 apical claw of moderate length. Mandibular palp exceedingly slender and 

 distinctly 3-articulate. Maxillae, as in the type species, without any trace of a 

 palp. Legs thin, resembling in structure those in P. variabile. 



Colour of shell rather characteristic, a broad transverse band of a dark 

 violaceous hue occupying the greater part of its extent, extremities pellucid 

 and tinged with golden yellow. 



Length of adult female scarcely exceeding half a millimeter. 



Male unknown. 



Remarks. The present form is easily recognisable from any of the other 

 species here .described, being well distinguished both by the general shape of 

 the shell and by its beautiful colour. It is one of the smallest species known. 



Occurrence. \ first found this form at Valla, lower part of the Oslo Fjord, 

 among algae near the beach, and have more recently also met with it at 



