SPEL^EODISCUS. 183 



Helix triaria Frivaldsky, Rossmaessler, Iconographie, ii, 

 1839, p. 13, pi. 47, f . 611. — Gonostoma (Aspasita) triaria 

 Rossm., Kimakowicz, Verh. etc., xl, 1890, p. 46. — Helix ocs- 

 kayi Stentz in sched. according to Pfeifper, Monographia Hel. 

 Viv., i, 1848, p. 411 (in synonymy of H. triaria). — Aspasita 

 triaria Hesse, NachrbL, 1915, p. 58 (anatomy). 



The size of the shell and degree of elevation of the spire 

 vary widely in the same lot. The sculpture appears to vary 

 locally; those from Mehadia, figs. 1, 2 (which may be taken as 

 type locality) and from the adjacent Herkulesbad have 

 widely-spaced riblets, while in another lot without definite 

 locality they are more delicate and closer, fig. 3. 



The invariably strong tooth within the outer lip distin- 

 guishes this from A. triadis. The callous thickening of the 

 lip is usually rather heavy, in adult shells distinctly thicker 

 than in triadis. 



2a. 8. triarius tatricus (Hazay). 



Differs from both of the preceding forms [triaria and tri- 

 nodis] by the thin whitish peristome almost without a lip- 

 callus, and by having only a denticle at the place where the 

 outer lip is impressed, the second tooth being absent or ap- 

 pearing hardly indicated {Hazay). 



Northern Carpathians in the High Tatra : Belaer Kalkalpen 

 und zwar in der Talschlucht Aufgang zum eisernen Tor und 

 unter dem Drechslerhaeuschen (Jos. Ullepitsch, J. Hazay). 



Helix triaria var. tatrica Hazay, Jahrb. D. M. Ges., xii, 

 1885, pp. 26, 27. 



I have not seen this form, and it has not been figured. As 

 described by Hazay, its characters are those of A. triadis; 

 yet as the localities are somewhat remote, a union of the two 

 without actual comparison might be premature. 



3. Speueodiscus triadis (Kim.). PL 22, figs. 4, 5. 



The shell is perspectively umbilicate, small, subglobose, 

 lamellicostate, brown, silky. The 6 convex whorls increase 

 regularly and are separated by a deep suture, the last one not 

 wider than the penult. The aperture is inversely ovate, 



