EAST AMERICAN SCAPHOPOD MOLLUSKS. 



The following are the National Museum records: 



139 



' Type. 



The following species of unique character seems to stand alone 

 among the Caduli of the Atlantic ; it is the only one in Group 3 referred 

 to in the consideration of the subgenus Gadila: ■ 



CADULUS (GADILA) CYLINDRATUS Jefifreys. 



Plate 20, fig. 15. 



1877. Cadulus cylindratus Jeffreys, Ann. Mag. Nat. Hist., ser. 4, vol. 19, p. 158. 



1882. Cadulus cylindratus Jeffreys, Proc. Zool. Soc, p. 664, pi. 49, fig. 6. 



1884. Cadulus cylindratus, Verrill, Trans. Conn. Acad. Arts and Sci., vol. 6, pt. 



1, p. 220. 

 1898. Cadulus (Gadila) cylindratus, Pilsbry and Sharp, Tryon's Man. Conch., 



vol. 17, p. 166, pi. 24, fig. 26. 



Two lots with a total of four specimens in the National Museum col- 

 lection seem referable to Jeffreys' species. The American specimens 

 average a trifle more in diameter as compared with the specimens in 

 the Jeffreys collection but differ in no other character. They are 

 probably the most featureless of all the Caduli. The American shells 

 may be described as small, gently curved, slightly contracted at. both 

 ends, otherwise of about equal caliber. They have no swelling. The 

 anterior aperture and the apical orifice are of about equal size, and 

 both are round. The anterior one is slightly oblique. There are no 

 recognizable apical features. Measurements are: 



Length, 7.3 mm.; diameter, 1.7 mm.; anterior and apical apertures, 

 1.4 mm. (Verrill). 



Length, 7 mm.; diameter, 1.25 mm.; anterior and apical apertures, 

 1 mm. 



Length, 8.1 mm.; diameter, 1.87 mm. (Jeffreys). 



In the museum collection are a lot of two specimens, Cat. No. 38030, 

 U.S.N.M., from the U. S. B. F. Station 2041, off Nantucket Shoals, in 

 1,608 fathoms, bottom of globigerina ooze, temperature 38° F., and a 

 lot of two specimens. Cat. No. 38692, U.S.N.M., from the U. S. B. F. 

 Station 2221, south of Marthas Vineyard, in 1,525 fathoms, bottom of 

 gray ooze, temperature 36.9° F. 



Jeffreys' records are also abyssal from oft" the West Coast of Ire- 

 land. These little deep water shells are almost devoid of characters 

 157582°— 20 10 



