A. JEJ. Verrill — 3follusca of the JVew England Coast. 439 



The anterior margin is nearly straight, the posterior dorsal margin 

 is slightly convex ; the two form an acute angle, while the ventral 

 margin is broadly rounded, or sometimes subtrnncate in the middle, 

 so that the anterior and posterior angles are obtusely rounded, the 

 posterior end being a little more prominent. The shell is somewhat 

 swollen in the larger specimen. The beaks are small and curve 

 directly inward. The hinge-margin is stout, with a rather large 

 cartilage-pit. The anterior row includes about eight elevated, acute 

 teeth, nearly in a straight row ; the posterior row is a little curved, 

 and includes about ten similar teeth. The interior is pearly, with 

 strongly marked muscular scars. The margin is plain. The epi- 

 dermis is firm, smooth, closely adherent, and light greenish yellow 

 in color. 



Length of the largest specimens, 1*5"""; height, o'""' ; breadth, 

 3mm Younger specimens are not quite so high in proportion to 

 their length. 



Station 2,194, in 1,140 fathoms, one valve; station 2,228, in 1,582 

 fathoms, one live specimen; and station 2,229, in 1,423 fathoms, 

 N. lat. 37° 38' 40", W. long. 73° 16' 30", six live specimens. 



This species is remarkable for its triangular form and the acute 

 angle formed by its dorsal margins, as well as for its smooth and 

 lustrous exterior. In all these characters it differs widely from all 

 our other species. 



Area profundicola Verrill and Smith, sp. nov. 



Plate XLIV, figures 23, 23a. 



Shell rather small, elongated, angular and oblique, very inequi- 

 lateral, with the posterior end elongated and expanded ; the anterior 

 end short and oblique, angulated above ; the ventral margin oblique 

 and incurved in front of the middle. 



The shell is covered with a rather coarse, dark brown epidermis, 

 rising into elongated and conspicuous scales and lamellie, which 

 become longer and more conspicuous posteriorly, where they form a 

 fringe beyond the margin. Beneath the epidermis the sculpture 

 consists of small, wavy, concentric ridges, parallel with the lines of 

 growth, and of rather fine, regular, radiating grooves, separated by 

 rather wider, rounded interspaces, which are often a little nodulous 

 in crossing the concentric ridges. The beaks are prominent, angu- 

 lar, curved inward and a little forward, and somewhat flattened in 

 the middle. A flattened or somewhat indented area extends from the 

 beaks to the margin. The dorsal margin is straight and is about 



Trans. Conn. Acad , Vol. VI. 55 May, 1885. 



