pose) 
HELICINA. 37 
Hab. W. Mnxico: Omilteme 8000 feet, on the Sierra Madre del Sur, State of Guerrero, 
Pacific side of the main Cordillera (H. H. Smith). | 
The suture of the upper whorls appears in some specimens slightly crenulated. 
20. Helicina durangoana. 
Helicina durangoana, Mousson, in Journ. de Conch. xxxi. p. 218. t. 9. fig. 8 (1883) *. 
Helicina, sp., Binney, Land~ and Freshwater Shells of N. Am. pt. 3 (Smithson. Miscell. Coll. vii. 
no. 144), p. 116, with woodcut (shell, operculum, and radula) (1865) *. 
Testa turbinato-conoidea, subangulata, superne leviter spiratim sulcata, albida, nitidiuscula ; spira conica ; 
anfr, 53, convexiusculi; apertura paullum obliqua, rotundato-triangularis, peristomate breviter expanso, 
albo, superne subsinuato, basali tenui, margine columellari subobliquo, basi in tuberculum prominulum 
terminato, extus foveolato, callo parvo, crasso, diffuso. 
Diam. maj. 10, min. 84, alt. 8 millim.; apert. diam. 54, lat. 44 millim. 
Hab. Cuntran N. Mexico: Sierra Madre (Xantus!); Ventanas, in the State of 
Durango 2000 feet (Forrer). 
Approaches somewhat H. sowerbyana, Pfr., but is much smaller and more conically 
elevated, and may be better joined to a Mexican than to a Guatemalan series. 
lV. Delicatule. 
Globoso-conicee, flavee, minutim striatule, parve, nitide. 
21. Helicina delicatula. 
Helicina delicatula, Shuttl. in Bern. Mittheil. 1852, p. 803 (Diagn. no. 3, p. 48)*; Pfr. Monogr. 
Pneum. Vivent. i. p. 193”. 
Helicina heloise (Sallé), Pfr. in P. Z. 8. 1856, p. 322, t. 35. fig. 17°; Monogr. Pneum. Vivent. ii. 
-p. 202*; Sow. Thes. Conch. iii. p. 288, t. 272. figg. 253, 254°; Reeve, Conch. Icon. xix., 
Helicina, t. 18. fig. 111 (magnified) °. 
Helicina flavida, var., Strebel, Abhandl. Geb. Naturw. Ver. Hamb. vi. 1, p. 17, t. 1a. figg.10c, d, 
t. 2. fig. 1057. | 
Hab. ¥:. Mexico: Cordova, State of Vera Cruz (Jacot-Guillarmod | 2, Sallé* 4, Hoge) ; 
Vera Cruz (Strebel); Mexico 5°®, 
S. Central Mexico: San Carlos, east of Oaxaca (Hége). 
Var. albida, peristomate crassiore. 
Hab. Ki. Mexico: Atoyac hills, near Cordova, Vera Cruz (fHége). 
One of the handsomest species, glossy yellow, with or without a red-brown, more or 
less broad band. I have compared Shuttleworth’s original specimen : it is somewhat 
worn (and is, therefore, not so glossy as fresh ones) and several lines of growth are 
rather strongly marked, which explains Shuttleworth’s: words “obsolete et grosse 
plicatula” ; in other respects there is no appreciable difference. 
In the variety the whole shell is somewhat thicker, white, with or without band; 
the callus in the banded specimen is orange. . 
