REPORT ON THE SCAPHOPODA. 19 



Toward the apex the bend increases, and the end of the shell is a very little contracted. 

 The shell is pretty strong, brilliant, opaquish white. Sculpture : Very rninute, but sharp, 

 microscopic scratches on the lines of growth. Mouth small, round, obliquely truncated 

 backward toward the convex curve. Edge thin and sharp. Posterior opening round ; 

 the edge thick, flat, slightly gnawed and broken, projecting a little on the convex curved 

 side. L. 0-35 in. B. at mouth 0-039; at swelling 0-069 ; at apex 003. 



This is smaller and less symmetrical than Cadulus colubridens, and the mouth is much smaller. 

 Than Dentalium clavatum, Gould, which it much resembles, this is more contracted in front and less 

 so behind, and has more of angulation in its tumidity; Than Cadulus gadus, Mont., this is a 

 much less stumpy shell, being less swollen in the middle, and more drawn out before and behind ; it 

 is also straighter. Cadulus ventricosus, Bronn, has the swelling nearer the mouth. 



3. Cadulus rastridens, Watson (PL III. fig. 3). 



Cadulus rastridens, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. LonJ, vol. xiv. p. 525. 



Station 24. March 25, 1873. Lat. 18° 38' 30' N., long. 65° 5' 30" W. Culebra 

 Island, AVest Indies. 390 fathoms. Pteropod ooze. 



Shell. — Like the tooth of a rake, small, narrow, bent, swollen, and on the convex curve 

 very faintly angulated at about five-eighths of its length, from which point both the bend 

 and the narrowing of the shell is greater (proportionately) toward the mouth than it is 

 toward the apex. Between the back and the belly there is a very slight compression of 

 the shell. It is pretty strong, brilliant, more or less obscurely banded transversely, with 

 alternate equal threads of opaque and transparent white. Sculpture ; Very faint, super- 

 ficial, transverse scratches. Mouth pretty large, not at all oblique, thin, sharp, and 

 chipped ; posterior opening round, straight ; edge thickened, and less chipped than the 

 mouth. L. 0-119 in. B. at mouth 0-015; at swelling 0-023 ; at apex O'Ol. 



4. Cadulus sauridens, Watson (PL III. fig. 4). 



Cadulus sauridens, "Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. LonJ., vol. xiv. p. 525. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30' W. Culebra 

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Long, narrow, scarcely bent, swollen very slightly near the middle of the 

 convex curve, just perceptibly and a little more anteriorly on the concave ; both the bend 

 and the contraction are greater towards the apex than towards the mouth. There is a 



