Occasional Papers of the Miiseiun of Zoology 51 



Spiroconnlus von Martens (1892). Type H. gnndlachi Pfr. 

 (1840). 



Conuhis vacaiis 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 gnndlachi, but is somewhat 

 larger. Young (?) specimens from Venezuela (Tate, collec- 

 tor) in the A. N. S. P., labeled as vacans, are very close to 

 gnndlachi, but have somewhat coarser whorls. These speci- 

 mens have 3^ whorls with practically the same diameter as 

 adult G. gnndlachi 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. gnnd- 

 lachi. 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. gnndlachi, 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 selcnkai is a synonym of Helix trochnlina Morelet 

 (T851}, 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- 



