REPORT ON THE SCAPHOPODA. 23 



Dr Gwyn Jeffreys verified my determination of this species. I have failed to see the callus-rib 

 in the mouth to which he refers ; but there is within the posterior opening a circular rib or narrow 

 sharp ledge, which from the outside is seen as an opaque band, but with some difficulty may be 

 seen within as a narrow projecting shelf. The edge of the apex seems to me rather chipped than 

 regularly notched. 



Dr Jeffreys in his " Lightning " and " Porcupine " Moll. (foe. cit.), speaking of this species, says 

 that " in all probability many of the species described by Mr Watson from the ' Challenger ' expedi- 

 tion, may ultimately prove to be united with some of the species which I have described." I think 

 it not impossible that his Cadulus gibbus, which I know only from description and figures, may turn 

 out to be my Cadulus ampullaceus ; but in that case it is this latter species which will survive. In 

 regard to 'the other three species which have priority to mine, and of which two are quoted above, my 

 own impression of course is that the Challenger species, which I have published as distinct from 

 these, are so. At the same time, not being infallible, I would gladly have reviewed my opinions had Dr 

 Jeffreys been good enough to use his familiarity with my species for calling my attention to any point 

 he thought doubtful. 



10. Cadulus exiguus, Watson (PI. III. fig. 10). 



Cadulus exiguus, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., voL xiv. p. 528. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Very small, short, broad, pinched in, and projecting at both ends; very 

 slightly bent, and that almost entirely in front ; very much swollen in the middle, bulging 

 on the concave curve, a little more attenuated behind ; pretty strong, polished, trans- 

 lucent and white, with an opaque white band round the apex. Sculpture : None. Mouth 

 large, straight ; edge thin and chipped. Apical opening small, straight, cbipped, narrowed 

 inside by a minute shelf-like projecting ring. L. - 076 in. B. at mouth - 016 ; at broadest 

 0-035; at apex 001. 



It differs from Cadulus ovulum, Phil., in being very much smaller, rounder, and ' contracted into 

 a tube at either end. 



11. Cadulus ampidlaceus, Watson (PI. III. fig. 11). 



Cadulus ampidlaceus, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., vol. xiv. p. 529. 



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

 Island, West Indies. 390 fathoms. Mud. 



Shell. — Small, round, but not symmetrical in its two curves, contracted in front, 

 pinched in behind so as to form a short tube, swollen, the fullest bulge lying behind the 



