COCCULINA. 133 



. ADUNCA Jeffreys. PL 25, fig. 21. 



Shell oblong, raised but contracted near the beak so as to make 

 the latter more prominent, rather thin, opaque and lustreless : sculpt- 

 ure, several fine striae which radiate towards the margin ; most of 

 them are alternately larger and smaller ; they do not extend to the 

 upper part of the shell ; color whitish ; beak placed in front, about 

 one-third of the whole length ; it is strongly incurved or hooked, 

 and has a subspiral and deciduous apex ; mouth oblong ; margin 

 thin, entire ; inside smooth and glossy ; head scar semicircular. 



Length 0'2, breadth 0'125 inch. 



A single and imperfect specimen but characteristic. Mr. Dall 

 has seen it, and says it is probably his Cocculina beanii. I will, 

 however, retain provisionally the specific name which I have given. 

 (Jeffreys.} 



Northeast Atlantic. 



Tectura adunca JEFFREYS, Proc. Zool. Soc. Lond. 1882, p. 672, t. 

 50, f. 4. 



C. LEPTALEA Verrill. PI. 25, figs. 7, 8. 



Shell small, oblong ovate, rather high, with a prominent, small 

 compressed, strongly recurved apex, with the tip small, strongly in- 

 curved ; in eroded specimens becoming free and overarching, situated 

 at about the posterior third of this shell. 



The anterior slope of the shell is decidedly convex and consider- 

 ably longer than the posterior slope, which is nearly straight, but a 

 little concave beneath the apex ; the side slopes are moderately con- 

 vex. The sculpture consists of strongly marked, raised, very thin, 

 and pretty regular concentric cinguli, which usually become finer 

 and much closer towards the apex, but continue nearly to the 

 extreme tip in perfect specimens ; the intervals on the lower part of 

 the shell are four times as wide as the cinguli, and are crossed by 

 numerous, fine, wavy, radiating lines, much finer and closer than the 

 cinguli, but easily visible with a lens ; in crossing the cinguli they 

 become a little thickened and give the margin of the latter a slightly 

 crenulated appearance when viewed from above. In some cases 

 these slight thickenings have the appearance of minute beads strung 

 along the upper margin of the cinguli. The aperture is oblong- 

 ovate, a little narrower anteriorly, with the sides a little compressed, 

 but still somewhat convex, and with the anterior and posterior mar- 



