168 A. E. Verrill—The Bermuda Islands; Geology. 
Zonitoides Bristoli Gulick. 
Op. cit., p. 421, pl. xxxvi, fig. 13, 1904. 
FiGuRE 51, TYPE. 
A minute species, having three convex whorls, which are finely 
costulate and covered with fine and regular spiral lines. Diameter, 
pepe hese. OTe. 
Recorded from the hard Walsingham limestone at station 807 by 
Gulick. Also from near Tucker’s Town, in sand-pits at station 818* 
(type). It was not observed by our parties. Not known living. 
Zonitoides minusculus Binney. 
Pilsbry, op. cit., 1900, p. 501, pl. lxii, fig. 11. Verrill, op. cit., p. 317 [729], 
fig. 71, 1892. Gulick, op. cit., p. 421, 1904. 
FIGURE 52, RECENT. 
This well-known, minute North American species was recorded by 
Gulick, as found with the preceding at station 807. It is not uncom- 
mon as a living species in Bermuda. It is widely distributed in 
North America, ranging northward to New England and southward 
to the West Indies. 
Figure 52.—Zonitoides minusculus, enlarged, after Binney. 
Figure 52a.—Thysanophora hypolepta, much enlarged, after Pilsbry. 
Figure 58.—Strobilops Hubbardi, enlarged 4 diameters, after Binney. 
Euconulus turbinatus Gulick. . 
Op. cit., 1904, p. 420, pl. xxxvi, figs. 8, 9, 10. 
Figures 55a, 55b, TYPES. 
A small conical species with a high spire and blunt apex. Whorls 
7%, narrow, nearly flat, umbilicus small, Diameter 2.8 to 3™™; 
height, 3.4™™. 
* The sandy or unconsolidated strata at this station probably belong to the 
Walsingham formation, as the characteristic fossils occur in them. 
