298 CYLICHNA. 



larger specimens has a slight fold, anteriorly ; a thin, white callus 

 covers the inner lip. The body-whorl is broadly convex, rounded 

 off gently anteriorly, and more abruptly posteriorly. The pit at the 

 apex, is well defined, showing some of the volutions, but is injured 

 in both of my specimens. Whole surface covered Avith fine, close, 

 minutely wavy spiral lines, scarcely visible without a lens. 

 Animal unknown. Length of the largest, 10 mill.; breadth in the 

 middle, 5*25 mill. ( Verrill). 



F. a stations 997 and 999, in 335 and 266 fathoms. 1881. 



Cylichna f dalli Verrill, Trans. Conn. Acad, v, p. 542, 1882 ; 

 vi, p. 274, pi. 29, f. 15, 1884.— Cou/. Dall, Blake Gastr. p. 47, and 

 Bush, Bull. M. C. Z. xxiii, p. 221.' 



See notes under C. vortex for the distinguishing features of this 

 species. 



C. verrillii Dall. Unfigured. 



Shell similar to C. alba Brown, in size and form with the ex- 

 ceptions following: It is bluish-white and never has the brown 

 outer coat of C. alba, though the extremely thin epidermis some- 

 times shows a light brown line marginating the apex. It is covered 

 all over Avith fine spiral stride. The columella is thickened and 

 twisted more than occurs in C. alba, and in C. verrillii has the effect 

 of an incipient plait. Lastly the aperture extends farther behind 

 the spire than in C. alba, and, instead of the margin being curved 

 over to a slight callus sealing the apex, there is a well marked per- 

 foration, most marked in the adult shells. Largest specimen 7'5 

 long by 30 mill. wide. 



Habitat, off the coast of North Carolina, at stations 2592, 2595, 

 2596, 2602 and 2612 of the U. S. Fish Commission, in from 50 to 

 124 fnis., sand, bottom temperature 58-75° F. 



CyUchna> verrillii J) ali., Blake Gastr., p. 54. 



This species is larger and more cylindrical than C. umbilicata of 

 Europe. It is nearer C. oj/indracea var. lineata, but is shorter in 

 proportion to its width, and its body is also shorter in proportion to 

 the whole length and more obliquely attenuated to the columella. 

 It has a striking similarity to C. alba when decorticated, until 

 closely examined. (Dall). 



C. EBURNEA Verrill. Tl. 27, fig. 5. 



Shell moderately large for the genus, firm, solid and thick for a 

 shell of this group. The shell is somewhat elongated, broadest in 



