280 MOLLUSCA. 
Var. hégeana. (Tab. XVI. fig. 17.) 
Aperture with a distinct angle outwards and above, as in H. goniostoma ; size, sculpture, and colour as in 
H., teres. 
Hab. E. Mexico: Maltrata, on the railway between Vera Cruz and the city of Mexico, 
a little west of Orizaba, eastern slope of the plateau (/ége). 
10. Holospira pfeifferi. 
Cylindrella pfeifferi, Menke, Zeitschr. fiir Malak. iv. p. 1 (1847) ?; Philippi, Abbild. neuer Conch. 
iii. p. 6, t. 3. fig. 42; Pfr. Monogr. Helic. Vivent. ii. p. 882°; Martini & Chemnitz, Syst. 
Conch.-Cab. ed. 2, Cylindrella, p. 60, t. 6. figg. 30, 31°. 
Holospira pfeifferi, Tryon, Am. Journ. of Conch. iii. p. 318, t. 15. fig. 34° ; Crosse & Fisch. Journ. 
de Conch. xviii. p. 18, t. 5. figg. 6-10 (jaw and radula) (1870)°; Fisch. & Crosse, Miss. 
Scient. Mex., Mollusca, i. p. 823, t. 16. figg. 6-10 (jaw and radula) "; Strebel, Beitr. Mex. 
Land- und Siissw.-Conch. iv. p. 84, t. 18. fig. 12°. 
Hab. Cuntrat Mexico: Tehuacan, in the State of Puebla (Liebmann 1~* ®8), 
Var. minor. 
Holospira pfeifferi, var. 8, Fisch. & Crosse, loc. cit. p. 324, t. 17. figg. 1, la-c’. 
Hab. N.W. Mexico: Cerro de la Campana, near Hermosillo, in the State of Sonora 
(Rémond °). 
Var. minima, n. (Tab. XVI. fig. 18.) 
Length 112 millim. only, 4 in the largest diameter ; aperture 23 millim.; whorls 11, distinctly convex; colour 
reddish-yellow, the costae white. 
Hab. Mexico: without nearer indication of locality (coll. Patel). 
The figure and dimensions given by Tryon® agree with the typical H. pfeifferi from 
Tehuacan, but not with the specimens from Sonora: either he has not taken both from 
Sonoran examples, or what Fischer and Crosse regard as a local form is only an 
individual variation. In H. claviformis and others a similar individual variation is to 
be found amongst specimens from the same locality. 
11. Holospira goniostoma. 
Cylindrella goniostoma, Pfr. Malak. Blatt. i. p. 47 (1856) *; Monogr. Helic. Vivent. iv. p. 710°; 
and in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Cylindrelia, p. 63, t. 7. figg. 7-9° ; 
v. Mart. Malak. Blatt. xii. p. 15 (1865) *. 
Holospira goniostoma, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 828, t. 17. figg. 4, 4a, 5°; 
Na. Beitr. Mex. Land- und Sutssw.-Conch. iv. p. 84, t. 14. figg. 6.4, B, c (columeliar 
axis) °, 
Hab. Muxico: without nearer indication of locality (Cuming1#4°; Uhde45). 
Uhde’s specimen is very much shorter (length 12 millim.) than that of Cuming 
length 15-154 millim.), and it has only 14 instead of 15-16 whorls; but in the 
