EAST AMERICAN SCAPHOPOD MOLLUSKS. 



119 



anterior aperture, 

 anterior aperture, 



anterior aperture; the convex side describes a strong curve, but 

 slightly interrupted at the equator, from which point the outline 

 is straighter in its descent to the larger aperture. The concave side 

 is more strongly curved posteriorly and shows at the point of maxi- 

 mum diameter a slight local convexity. The anterior aperture is 

 oblique, with rounded peristome. The entire shell is somewhat 

 flattened. When view^ed upon its convex or concave side the shell 

 is decidedly fusiform. The apical orifice is relatively small and its 

 rim is modified by two semicircular shallow wide notches, dorsal and 

 ventral, leaving two lateral bluntly pointed lobes. These are not, 

 however, like the deep narrow^ lateral notches of the subgenus Dis- 

 cJiides. Measurements are: 



Length, 10 mm. ; maximum diameter, 2.25 mm. 

 1.75 mm.; apical aperture, 0.4 mm. (Type). 



Length, 11 mm.; maximum diameter, 2 mm. 

 1.40 mm.; apical aperture, 0.6 mm. (Florida). 



The type. Cat. No. 38644, U.S.N.M., was dredged by the Fish Hawk 

 atU. vS. B. F. Station 876 off Marthas Vineyard, in 120 fathoms, bot- 

 tom of soft, sticky mud, temperature 53° F. 



In the museum collection are lots from off Marthas Vineyard and 

 Nantucket, in 85 to 386 fathoms; also from the Florida Keys region 

 and off Cape Florida and Fowey Light, in 70 to 200 fathoms. 



The Florida specimens are altogether typical. With all the 

 American dredging records between these two regions it seems strange 

 that none should lecord this species. Numerous lots of Caduli from 

 the Hatteras region, so identified in the museum coUection, upon 

 more critical examination appear to be G. agassizii and C. rusUL 



This well-marked species is at once recognizable by its pecuUar 

 apical characters and by the crooked or "dog tooth" shape, as of 

 C. vulpidens, an appearance given by the slight obliquity of the equa- 

 tor. It is one of the very abundant species in the regions occupied. 

 The following are the lots in the National Museum coUection: 



Locality. 



Remarks. 



Marthas Vineyard, U. S. B. F. Station 876. 

 Marthas Vineyard, U . S . B . F. Station 874 . . 



Marthas Vineyard , U . S . B . 



Off 'ewport, Rhode Island, 

 ' 871. 



1 Marthas Vineyard, L! . S. B. 

 I Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 

 ' Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



Marthas Vineyard, U. S. B. 



F. Station 871 , 



U. S. B. F. Station 



F. Station 876.. 

 F. Station 870.. 

 F. Station 2539. 

 F. Station 2555. 

 F. Station 869. 

 F. Station 1142. 

 F. Station 871.. 

 F. Station 873.. 

 F. Station 876.. 

 F. Station 877.. 

 F. Station 945.. 



120 fms., 53°,sft .stk. m. (type lot). 

 85 fms., 51°, sft. stk. m..(figured 



1896). 

 115 fms., 49° (figured 1896). 

 115 fms., 49° (typical) m. s. 



120 fms., 53°, sft. stk. m. 

 155 fms., m.fne.s. 

 133fms.,48°, gn.s. 

 136fms.,48°, gn.m.s. 

 192fms.,50°,fne.s. 

 322 fms., 41°, m.s. p. 

 115 fms., 49°, m.fne.s. 

 100 fms., 51°, sft. stk. m. 

 120 fms., 53°, sft stk m. 

 126 fms., 57°, sft. stk. m. 

 207 fms., 44° gn.m.s. 



