816 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



Family VEBTICOBDID^B. 



VERTICORDIA GRANULIFERA (Verrill) Dall. 

 (Plates LXXXVII, fig. 2; XCV, figs. 2, 3, 4.) 



Pecchiolia granulifera VERRILL, Trans. Conn. Acad., VI, pp. 434, 448, 450, 1885. 

 Verticorilia grani/era DALL, Bull. Mus. Coinp. Zool., XII, p. 286, ]886. 

 Terticordia granulifera DALL, Bull. U. S. Nat. Mus., No. 37, p. 66, 18S9. 



In addition to the published description, it should be stated that in 

 the type-specimen (No. 44838), the luuular area is small, deeply sunken, 

 with the corresponding internal margin very much thickened, forming 

 a strong", curved, tooth-like projection having" a rounded summit, reach- 

 ing strongly above the margin of the shell when seen in a profile view; 

 behind this, directly under the beak and beneath the overhanging 

 margin, there is a triangular space or notch for the reception of the 

 prominent tooth of the opposite valve; this is followed posteriorly by 

 a short, triangular, shelf-like projection, a little beneath the margin, 

 which has a depression on its upper surface for the reception of its 

 ligament but shows, in this specimen, no notch or scar corresponding 

 to the ossicle. Directly under the strongly incurved beak there is a 

 slight, thin groove in which the front part of the ligament was attached. 

 The postero-dorsal edge is a little thickened and projects inward beyond 

 the general line of the margin ; its outer surface has a smooth, slightly 

 excavated groove, extending parallel with the edge, for some distance; 

 this portion was overlapped by the projecting edge of the opposite 

 valve. 



A very large specimen (No. 78679) from station 2713, which measures 

 21 mm. in length, 22 mm. in height, and 10 mm. in thickness, has, in 

 the right valve, directly beneath the beak, a very strong, high, curved, 

 pointed, angular tooth attached by a very broad, thick base, a con- 

 siderable distance within the margin. Behind the ossicle, well within 

 and nearly parallel with the margin for its entire length, is a conspicu- 

 ous shelf-like ridge against which the projecting edge of the opposite 

 valve rests. The ossicle is strong, somewhat rectilinear in outline, 

 with the posterior end deeply forked, the inner surface strongly con- 

 vex, the outer strongly concave, with thick, somewhat beveled edges, 

 to which the ligament is attached. Interior surface somewhat pearly. 

 Scars and pallial line not very clearly defined. 



But four specimens, beside the type, have been found at four stations 

 between N. lat. 40 9' 30", W. long. 67 9', and N. lat. 36 47', W. long. 

 73 9' 30", in 1,350 to 1,859 fathoms, 1884-1880. 



