REPORT ON THE SCAPHOPODA. 21 



Station 187. September 9, 1874. Lat. 10° 36' S., long. 141° 55' E. West of Cape 

 York. 6 fathoms. Coral mud. 



Shell. — Very like Cadulus gracilis, Jeffr. ; rather broad, narrowed at both ends, very 

 slightly and symmetrically bent, but a little more towards the mouth, with a very slight 

 bulge, which just shows on the concave curve. It is thin, polished, translucent (weathering 

 opaque), with an opaque ring near the apex. Sculpture : Very minute and faint superficial 

 oblique striae, with a faint flocculence iu the substance of the shell. Mouth rather large, 

 oblique; edge thin, but rounded. Apical opening small, thin, and chipped. L. - 16 in. 

 B. at mouth 0-02 ; greatest 0-036 ; at apex 0'014. 



This differs from Cadulus gracilis, Jeffr., in being broader, with a slight bulge on the concave 

 curve, in being a little more bent, and in not being compressed. It is also larger. It is extremely 

 like Cadulus Jeffrey si, Monter., but is a little more bent, especially in front, is larger, and seems a 

 thinner shell. 



* 7. Cadulus curtus, Watson (PI. III. fig. 7). 



Oadulus curtus, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., vol. xiv. p. 527. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



SJiell. — Short, broad, narrowed at both ends, scarcely bent, and that almost wholly 

 near the mouth ; swollen in the middle, so as to bulge a little on the concave curve. 

 Though the mouth is larger than the apex, the whole shell is a little more pinched in in front 

 than behind, and is very slightly laterally compressed (in the proportion of about 14 to 15). 

 It is thin, polished, translucent white, with one, sometimes two, opaque rings near the 

 apex. Sculpture : Only under a high power of the microscope can some very close trans- 

 verse striae be seen in the texture of the shell. Mouth rather large, very slightly oblique ; 

 edge thin and generally much chipped. Apical opening small, straight, chipped. The 

 opaque rings result from thickening, caused by a thin projection which narrows the 

 opening. L. - l in. B. at mouth 0'019; greatest - 03; apex 0*012. 



Than Cadulns curtus, var. congruens, Wats., this is not only very much smaller, but here the 

 mouth is oblique, and the shell straighter behind and more bent in front, where, too, it is more 

 pinched in. It is nearly of the same length as Cadulus obesus, Wats., but is very much narrower. 



7a. Cadulus curtus, var. congruens, Watson (PI. III. fig. 7a). 



Cadulus curtus, var. congruens, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., vol xiv. p. 527. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



