ORTALICHUS. 189 
In short, these twenty-two specimens prove that it is very difficult, or rather 
impossible, to trace clear and precise specific distinctions in this genus. 
9. Ortalichus longus. 
Bulimus zebra, var. 8, Pfr. Monogr. Helic. Vivent. ii. p. 144°. 
Orthalicus longus, Pfr. Malak. Blatt. iii. p. 187 (1856)?; Monogr. Helic. Vivent. iv. p. 589°; 
v. Mart. in Malak. Blatt. xii. p. 39 (1865)*; Fisch. & Crosse, Miss. Scient. Mex., Mol- 
lusca, i. p. 450, t. 18. fig. 4°; Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 48, t. 6. 
figg. le, d’. 
Hab. Centran Mexico: State of Michoacan, especially at Ario (Uhde4*); Cuernavaca 
in the State of Morelos (Boucard*); Mexico, without nearer indication of locality 
(Hegewisch 2 °°), 
S. Mexico: State of Oaxaca (Boucard °). 
10. Ortalichus livens. 
Orthalicus livens (Beck), Shuttl. Notitie Malac. i. p. 64, t. 3. fig. 8°; Pfr. Monogr. Helic. 
Vivent. iv. p. 589°; Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 453, t. 18. 
fige. 6,6 a’. 
Hab. Yi. Mexico: probably near Vera Cruz (Sandoz ! 2). 
Var. uhdeanus: strigis continuis, crebris. 
Orthalicus livens (Shuttl.), v. Mart. in Malak. Blatt. xii. p. 88 (1865) *; Pfr. Monogr. Helic. 
Vivent. vi. p. 200, nota’; Strebel, Beitr. Mex. Land- und Sitissw.-Conch. v. pp. 32, 33, 
t. 11. fig. 19°. 
Hab. W. Mexico: West coast, State of Michoacan (Uhde *®). 
Among the large number of specimens of this genus which Strebel and I have 
examined, not one agrees satisfactorily with Shuttleworth’s description and figure of 
O. livens ; but as Fischer and Crosse? represent a very similar specimen, only of larger 
size, under the same name, it must be placed among the Mexican species until further 
information is obtained. 0. livens seems to be characterized by the elongated form, 
and by the streaks being few in number and chiefly represented in the middle part of 
the last whorl, where they expand sometimes to broad blotches, attenuated or vanishing 
above and beneath, somewhat as in 0. princeps. The West-Mexican specimens which 
I referred 4 to this species differ in the more numerous and equally continued streaks ; 
they approach nearer to O. longus, but differ from that species in the sutures being 
less deep, which gives a more continuously conical appearance to the whole shell, 
instead of the graduated form of O. longus. 
