Occasional Papers of the Museum of Zoology 51 
Spiroconulus von Martens (1892). Type H. gundlachi Pfr. 
(1840). 
Conulus vacans Guppy, from Trinidad, is thus the type of 
the first usable name, Guppya. It is a form which is appar- 
ently closely related to Guppya gundlachi, but is somewhat 
larger. Young (?) specimens from Venezuela (Tate, collec- 
tor) in the A. N. S. P., labeled as vacans, are very. close to 
gundlachi, but have somewhat coarser whorls. These speci- 
mens have 34 whorls with practically the same diameter as 
adult G. gundlachi with 5 whorls. Guppy (1866) describes 
the caudal projection, the marked spiral striation, and the 
radula. | 
The description of the last is: “Lingual teeth about 30.5.0. 
5.30, broad, subequal, central obsolete; first five laterals sym- 
metrical with a large rounded cusp having a smaller cusp of 
similar shape on each side; outer laterals bicuspid, resembling 
the teeth of Testacellus.” His supposition that the central is 
obsolete is doubtless due to the difficulty of its identification. 
The description of the laterals agrees with those of G. gund- 
lachit. Due to the overlapping of the marginals, as already 
pointed out, these would appear bicuspid under the microscope 
available in 1866. 
Spiroconulus von Martens, type G. gundlachi, thus becomes 
a synonym of Guppya, which is not Guppya s. s. of von Mar- 
tens (1892). According to Pilsbry (1910), Ernstia is also a 
synonym. From the shell characters of the specimens I have 
seen, I think it likely that G. biolleyi von Martens (1892) will 
also be found to belong in Guppya. 
Helix selenkat is a synonym of Helix trochulina Morelet 
(1851), so the species of which the radula has just been 
described may be considered as typical of Habroconus, which 
is used here as a subgenus of Guppya. From the shell char- 
