Cyclostrema, Adeorbis, Vitrinella, and related genera. 135 



Greatest diameter about '2-2'""^; height, about I'Q""^. 

 One dead specimen, among forarainifera, at station 2150, N, lat. 

 13° 34' 45", VV. long. 81° 21' 10", in 382 fathoms, 1884. 



Section Granigyra Dall. See p. 116. 



Type, Granigyra limata (Dall). 



Cyclostrema (Granigyra) limatum Dall, Bull. Mus. Comp. ZooL, xviii, p. 395, 1889; 

 Bull. U. S, Nat. Mus., No. 37, p. 166, 1889. 



A single dead specimen, found among forarainifera, from station 

 2150, N. lat. 1-3° 34' 45", W. long. 81° 21' 10", in 382 fathoms, 1884, 

 agrees, except in size, with Mr. Ball's description of his type from off 

 Cuba, in 310 fathoms. My specimen measures about 2°"° in greatest 

 diameter and about 2-5™™ in height, and in this respect comes nearer 

 the G. pruinosa of Jeffreys, the measurements of which are given as 

 "L. 0.175, B. 0.15." 



Granigyra spinulosa sp. nov. 



A single dead specimen, found among foraminifera, from station 

 2655, N. lat. 27° 22', W. long 78° 07' 30", in 338 fathoms, 1886. 



This is a larger shell than the preceding but is of the same size as 

 the type-specimen of that species, of a delicate yellow color with the 

 granulations of the surface much coarser and more prominent. 



It has about three well-rounded, rather loosely coiled whorls, 

 forming an elevated spire with relatively large, prominent nuclear 

 whorl and very large body-whorl. Suture well-marked, rather deep. 

 Umbilicus of good size, deep, with rounded walls. Aperture as in 

 typical Ussospira, with the peritreme but slightly attached at the 

 suture. Granulation of the surface very conspicuous, the granules, 

 when seen in profile, appearing like little spines. 



Greatest width, 2*5""°', height the same. 



Leptog^ra gen. nov. 



This genus is constituted for a group of three species of minute, 

 semi-transparent, dull, dirty white or faintly brown shells covered 

 with a thin, rather tough, delicate straw-colored epidermis, consist- 

 ing of a few convex whorls forming an elevated spire with relatively 

 large, smooth, slightly twisted nuclear whorl and large body-whorl. 

 Suture deep, somewhat channeled. Umbilicus relatively large, 

 I'ound, deep, showing some of the whorls, with rounded walls. 



