HELIX. 159 
d.. intermedia: trochiformis, subangulata, supra obsolete fasciata et rare guttulata, infra fusco-fasciata. 
(Figg. 1, 1a.) 
Helix trigonostoma, var. 8. intermedia, Fisch. & Crosse, loc. cit. p- 291, t. 11. fig. 66™. 
Hab. N. Guatemata: Senahu in Vera Paz (Champion). 
S. Guatemata: San Agustin, very common (Bocourt 14); Cerro Zunil (Stoll). 
e. stolliana : late trochiformis, subangulata, fuscescens, supra guttulata, infra fusco-fasciata. (Figg. 2, 2 a-7, 7 a, 
11, 12.) 
Helix salleana (Pfr.), Reeve, Conch. Icon, vii., Helix, t. 102. fig. 564%. 
Heliz trigonostoma, var. subunicolor, Fisch. & Crosse, loc. cit. p. 292, t. 11. fig. 6c". 
Heliz trigonostoma, Stoll, Guatem. Reisen und Schild. aus den Jahr. 1878-83, p. 198”. 
Hab. 8. & W. GuatemaLa: Cerro Zunil, Pacific slope, near Quezaltenango, common, and 
El Reposo between Retalhuleu and the Pacific (Champion) ; San Agustin, in woods 
(Bocourt 1°); the commonest species of Helix on the western slope of the 
Cordillera, between 2500 and 4500 feet above the sea, at Hacienda San Francisco, 
Miramar, and Helvetia, Buenavista, in woods (St¢ol/ 1"). 
f. freytagiana (H. freytagiana, Dohrn, in litt.): testa trochiformis, obtuse angulata, obtecte perforata, leviter 
costulato-striatula, distincte malleata, fuscescenti-fulva, guttulis raris fuscis picta, obsolete fasciata ; 
anfr. 43, 14 primi leves, convexi, letius fulvi, sequentes supra convexiusculi, ultimus basi subplanatus, 
antice vix deflexus. Apertura parum obliqua, rhombeo-triangularis, intus fusca; peristoma modice 
reflexum, album, retro fusco-cinctum, margine supero fere rectilineo, infero modice arcuato, ad insertionem 
dilatato, appresso, perforationem fere totam obtegente. (Figg. 8, 8a, 9, 9a.) 
Diam. maj. Diam. min. Alt. Apert. diam. Alt. obliqua. 
mm. mm. mm. mm. mm. 
31 25 233 16 144 
30 24 22 17 14 
38 32 27 19 164 
Hab. Honpuras (coll. Dohrn). 
Dr. O. Stoll, in his MS. notes, states that in this species the back of the foot is 
provided with a median crest of papilla as in H. eximia, and even more conspicuously 
than in ZH. ghiesbreghti, although it is not shown in the figure of the living animal 
given by Fischer and Crosse, op. cit. t. 11. fig. 6 6. 
This species is very variable, not only in form but in colour. We may distinguish 
the rather broadly conical forms with a distinct angle at the periphery *, such as the 
typical trigonostoma and the var. stolliana, and the higher, not angulated forms, as 
the varr. elevato-conica and salleana; but they run almost insensibly one into the 
other. Fischer and Crosse’s var. luteo-albida (their fig. 6) is an intermediate form 
between the type and var. elevato-conica. The variations in colour are apparently of 
somewhat more importance, as they agree with the geographical distribution—those 
* In the figure in Martini and Chemnitz, ed. 2, t. 49. f. 10 4, the drawing of the angle is perhaps too sharp ; 
I have never seen a specimen with it so sharp, though I have before me shells of similar size and colour. 
20* 
