268 BULLETIN OF THE 



Subgenus GEGANIA Jeffreys. 

 Gegania Jeflreysi Dall. 



Shell white, four-whorled, with the nucleus immersed in the coil of the first 

 dextral whorl ; sculpture like that of G. pinguis Jeffreys, reticulate, with three 

 or four strong spirals, as many finer intercalary ones, and numerous fine trans- 

 verse threads, strongest behind the periphery. Whorls full and rounded, suture 

 distinct; base a little flattened, with six or seven primary spirals; perforate; 

 the aperture rounded, effuse at the end of the straight thin slightly reflected 

 pillar; outer lip thin. Alt. of shell, 5.0 ; max. lat. of shell, 3.0 mm. 



Habitat. U. S. Fish Commissi on Station 2668, off Fernandina, Florida, in 

 294 fms., sand, temperature 46°. 3 F. 



This is proportionally more elevated and slender than G. pinguis, which 

 also has the umbilicus open when young. It is probably closed in both when 

 adult, the present specimen being not fully grown. G. pinguis also has the 

 whorls more angulate, the aperture more effuse in front, and is a larger and 

 frailer shell. Both suggest Trichotropis by the shell characters, except as to 

 the nucleus. 



Family SEGUENZIIDJE. 



Genus SEGUENZIA Jeffreys. 



Seguenzia Jeffreys, Proc. Roy. Soc. p. 200, 1876. 



Seguenzia ionica Watsox. 



Seguenzia ionica Watson, Lin. Soc. Journ., XIV. p. 589, 1879; Dall, Bull. M. C. Z., 

 IX. p. 48, 1881 ; Watson, Chad. Rep. Gastr., p. 107, pi. vii. fig. 3. 



Habitat. Station 33, in 1568 fms. 



Of the fragments referred to this species in 1881, one proves to belong to 

 B. alta Watson, and the other went to powder while being transferred from 

 one tube to another. There can be no doubt, however, as to the correct 

 identification of the last mentioned. 



A specimen of S. trispinosa Watson was dredged by the U. S. Fish Commis- 

 sion in deep water off the east coast of the United States, south of Hatteras ; 

 but the label showing the exact locality was unfortunately lost before the 

 bottle containing it reached my hands. 



Seguenzia monocingulata Seguenza. 



Seguenzia monocingulata Seguenza, Bol. Com. Geol., VII. p. 188, May, 1876 ; Watson, 



Chall. Rep. Gastr., p. 105, 1886. 

 Seguenzia formosa Jeffreys, Rep. Valorous Cruise, June 15, 1876, p. 200; Dall, Bull. 



M.C. Z., IX. p. 47, 1881. 



