206 



with the terminal joint very small, not even attaining half the length of the 

 preceding joint. Posterior antennae with the dividing suture of penultimate 

 joint occurring nearly in the middle. 



Male unknown. 



Colour uniformly dark blackish extending over the whole of the shell. 



Length of adult female 0.59 mm. 



Remarks. In its general appearance this form bears some resemblance 

 to the above-described species C. similis. It is however of rather larger size, 

 and has the shell comparatively more elongate, with the infero-posteal corner 

 distinctly angular. When observed in the living state, it is moreover at once 

 distinguished by the uniform blackish colour of the shell, which character has 

 indeed given rise to the specific name proposed. 



Occurrence. The only place where I have hitherto met with this species 

 is at Skraaven, one of the Lofoten islands, where a few female specimens 

 were taken in a depth of about 3 fathoms, sandy bottom. 



Distribution. Shetland. 



Fossil. Norway, Scotland. 



103. Cytherura intumescens, G. O. Sars, n. sp. 



(PI. XCVI, fig. 1). 



Specific Characters. Female. Shell much inflated, seen laterally, oval 

 subquadrangular in shape, equally high in front and behind, greatest height 

 slightly exceeding half the length, dorsal margin nearly straight in the middle, 

 and sloping behind with an even curve to the posterior protuberance, ventral 

 margin slightly sinuated in the middle and rather strongly bowed behind, but 

 without any trace of a projection or distinct angle, anterior extremity broadly 

 and somewhat obtusely rounded, posterior produced to a well defined protu- 

 berance located distinctly above the longitudinal axis of the shell; seen dor- 

 sally, very broad and somewhat lozenge-shaped, with the greatest width in 

 front of the middle and considerably exceeding half the length, anterior 

 extremity tapered to an obtuse point, posterior abruptly contracted to a conical 

 prominence. Surface of valves evenly convex throughout and exhibiting a 

 well-marked reticulate pattern. Anterior antennae with the terminal part rather 

 slender, 2nd joint the largest, last joint only slightly shorter than the preceding- 

 one. Posterior antennae with the dividing suture of the penultimate joint 

 occurring considerably above the middle. 





