PUNCTURELLA. 239 



straight or but slightly convex outline. The side slopes are steep, 

 regularly and slightly convex. 



Length 5, breadth 3, height 2 mill. ( Verrill.) 



Off Rhode Island, 1451 fins. 



Puncturella (Fissurisepta) eritmeta V., Trans. Conn. Acad. vi, p. 

 204, t. 32, f. 19, 19a. P. eritmeta DALL, Catal. Mar. Moll. S.-E. TJ. 

 S., p. 170. 



P. ABYSSICOLA Verrill. 



Shell moderately large, elliptical or ovate in outline, a little nar- 

 rowed anteriorly, evenly convex along the sides, and rounded pos- 

 teriorly, moderately elevated, with the apex small, not very promi- 

 nent, acute and curved backward and inward, situated a little 

 behind the middle. The posterior slope is at first a little concave, 

 owing to the position of the beak ; the anterior slope is gently con- 

 vex. The foramen is elongated fusiform, broadest in the middle, 

 tapering both ways to acute points, but most acute anteriorly ; its 

 posterior end does not reach the vertex and terminates some distance 

 from the apex ; it is thickened and partly filled up within. A 

 .slightly elevated ridge runs from the anterior end of the opening to 

 the front end of the shell, but is scarcely larger than the other ribs. 

 The sculpture consists of about forty rounded, moderately elevated, 

 nodulous, radiating ribs, with an alternating series of similar but 

 smaller ribs on the lower half. The surface is covered with concen- 

 tric, raised lines, which are nearly as prominent as the radii, pro- 

 ducing a cancellated structure and forming the small rounded nod- 

 ules where they cross. The internal septum is highly developed, 

 large, strong and tubular, extending down in front farther than the 

 foramen, with narrow lateral ridges extending nearly to the front 

 edge of the shell. The edge of the shell is thin and slightly crenu- 

 lated by the ribs. Length 10, greatest breadth 7, height 5, anterior 

 edge to apex 8, posterior edge to apex 4'5, length of foramen 1*6 

 mill ( Verrttl.) 



N. lat. 39 03' 15", W. long. 70 50' 45", in 1537 fms. 



P. abyssicola VERRILL, Trans. Conn. Acad. vi, p. 425. 



This species differs from P. noachina in being much less elevated, 

 with the sides not flattened ; in having the apex less prominent and 

 farther back ; in the distinctly and rather coarsely cancellated 

 structure ; and in having a broader and more fusiform foramen, 

 situated more anteriorly and not extending so far toward the apex ; 



