EAST AMERICAN SCAPHOPOD MOLLUSKS. 127 



convex side describes an uninterrupted arch]. The aperture is con- 

 tracted and not flattened [except slightly laterally and is oblique]. 

 [There is no local swelhng or gibbosity at the equator, nor is the shell 

 compressed unless very slightly so laterally.] The apical characters 

 are not clear, but indicate indistinctly two lateral chipped but 

 rounded notches, leaving bluntly pointed lobes on the convex and 



concave sides. , n - • 



The type is in the Museum of Comparative Zoology collection, 



Cat No. 7747, and measures— length, "6" mm.; diameter, 1.5 mm.; 



anterior aperture, 0.75 mm.; apical aperture, "0.87" mm. It was . 



taken at United States Coast Survey Station 2, off Habana, Cuba, 



in 805 fathoms, bottom temperature 39.75° F. 



This little Cadulus is easily distinguished from C. husUi by its 



lack of dorso-ventral compression and from all others by its slight 



lateral compression. The shell is more inflated than are any of the 



other species of similar length. n + at 



In the National Museum collection is a single specimen. Cat. JNo. 



314940 US.N.M., dredged by the State University of Iowa, 1918, 



at their station 79, ofl' Pelican Island, Barbados, in 70 fathoms. 



CADULUS (PLATYSCHroES) SIMPSONI, new species. 



Plate 19, fig. 17. 

 1901. Cadulus carolinensis bushn Dall and Simpson, Bull. U. S. Fish Comm. 

 for 1900, vol. 1, p. 457 (not of Dall, 1889). 

 The shell is small, slender, slightly curved, with its equator at 

 about the anterior two-fifths or almost median and with no local 

 swelhng or bulbous appearance. The convex side presents a regular 

 arch, even and unbroken; the concave side is almost a straight line 

 except for some curvature at the posterior end and a slight convexity 

 at the equator. The anterior aperture is a little contracted and 

 laterally compressed, and is also quite oblique; the apical orifice is 

 round; the shell is not conspicuously compressed or flattened but is 

 a trifle so laterally in its anterior portion. The apical characters are 

 too indistinct for definite description, but are probably ot the 



^rtpe, cTt!'^o. 161580 (a), U.S.N.M., was taken at the U. S. 

 B. F. Station 6062, Mayaguez roadstead, Porto Rico, m 2. fathoms 

 bottom of sand, mud, and shells, temperature 75.8° F ^^om a lot of 

 29 specimens. It measures-length, 7.5 mm.; diameter, 1.3 b> 1.-.5 

 mm.; anterior aperture, 0.7 mm.; apical aperture, 0.4 mm. 



In the National Museum collection are also a lot of six specimens 

 Cat. No. 314677, U.S.N.M., Ensenada de Cochmos, Cuba, 100 to 15U 

 fathoms, from Eolis Station 232; a lot of four ^P^^^^^^^^f t, .in 

 314932, U.S.N.M., collected at the State Umversity of lo^a fetation 

 115, off English Harbor, Antigua, in 120 fathoms. 



