HELIX-CAMPYL^A. 227 



not aware. The relationship of H. magdalenensis to rowelli is like 

 that of the Californian snails H. exarata to H. arrosa, of the small 

 forms of H. fidelis to H. mormonwn, or of H. stearnsiana to H. kel- 

 lettii, etc. Its dimensions are in every way less than those of rowelli 

 -\-lohri. (Steams.) 



Section CAMPYL^EA Beck, (Vol. IV, p. 83.) 



H. TIESENHAUSENI Gredler. PI. 25, figs. 7, 8, 9. 



Allied to H. planospira, but differs in having a rather smaller 

 shell, thin, shining, greenish-hyaline, ivithout band; whorls of the 

 spire less convex ; last whorl not inflated, lower, less descending in 

 front. Aperture much less oblique and rounded ; peristome less 

 expanded, the lower margin less reflexed. 



Alt. 11-12, diam. 26 mill. 



Mis. between the Eisack and the Avisio. 



H. tiesenhauseni GREDL., Nachr.-Bl. D. M. Ges. xxi, 1889, p. 

 195. KOBELT, Kossm. Icon. n. f. v, p. 77, f. 885. 



This is a local race of H. planospira, produced by the lack of 

 lime in the soil ; but its characters are so strongly marked that a 

 name is necessary for it. 



H. NICOLISIANA Adami. PI. 25, figs. 13, 14, 15. 



Shell perspectively umbilicate, depressed, rather solid, but not 

 thick ; delicately irregularly striated, peculiarly corrugated at the 

 suture ; under a strong lens seen to be spirally, very finely lineolate 

 with short impressed lines ; whitish or greenish-white, ornamented 

 with narrow brown bands above the middle ; spire nearly flat, the 

 apex small, horny, but slightly projecting ; whorls 6, a little convex, 

 separated by a impressed suture, the upper slowly and regularly 

 increasing, the last whorl large, dilated, compressed, rotund or very 

 obsoletely subangulate ; base somewhat flattened, subangulate 

 around the umbilicus, vertically passing into it ; shortly deflexed in 

 front ; aperture very oblique, ovate, rotund, little lunate, brownish 

 within, showing the bands ; peristome shortly reflected, white lipped, 

 the margins converging, joined by a very thin callus ; columellar 

 margin slightly dilated at the insertion. (JTo&.) 



Alt. 10, greater diam. 23, lesser 20 mill. 



Province of Verona, on Monte Zevola and Monte ire Croei, 2,000 

 meters alt. 



