POLYGYRA. 167 
Albers, which has the spire a little elevated, and the upper external tooth scarcely 
larger than the lower one. 
The variety approaches P. plagioglossa, but can be distinguished from it by the 
umbilicus being larger, and surrounded by an obtuse angle, and by the flat upper side. 
7. Polygyra plagioglossa. 
Helix plagioglossa, Pfr. P.Z.S. 1859, p. 26, t. 43. fig. 3°; Malak. Blatt. p. 33 (1859) *; Monogr. 
Helic. Vivent. v. p. 420°. 
Helix (Polygyra) plagioglossa (Pfr.), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 270, t. 12. 
fige. 9, 9 a-c’*. 
Polygyra plagioglossa (Pfr.), Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 45, t. 15. fig. 12°. 
Hab. Cuytrat Mexico: State of Puebla (Boucard+; Berkenbusch, in mus. Berol.). 
S. CentraL Mexico: Oaxaca® (Sallé 1°, Boucard +). 
Characterized by the comparatively small and simple, obliquely placed, parietal 
plait, and in this respect resembling P. cowloni, Shuttl., but much more flat. 
8. Polygyra dissecta, sp.n. (Tab. VII. figg. 7, 7 a-c.) 
Testa anguste et pervie umbilicata, subdepressa, leviter striatula, fulvo-cornea, nitidula ; spira breviter conoidea ; 
anfr. 53, convexiusculi, ultimus rotundatus, basi valde convexus, ad aperturam constrictus et deflexus ; 
apertura perobliqua, late lunata, peristomate reflexo, albo ; paries aperturalis plica obliqua modice simplice 
munitus, margo externus dentibus 2 humilibus subelongatis margini parallelis incisura angusta triangulari 
separatis, margo basalis denticulo uno parvo obtuso. 
Diam. maj. 9, min. 74, alt. 34; apert. diam. 4, lat. obliq.’4 millim. 
Hab. Centrat Mexico: Toluca (fége). 
One specimen only. In general appearance very like /. plagioglossa, but to be 
distinguished by the two laminar teeth on the outer margin. | 
9. Polygyra couloni. (Tab. VII. figg. 6, 6 a-d.) 
Helix couloni, Shuttl. in Bern Mittheil. 1852 (Diagn. no. 2, p. 17), p. 197"; Pfr. Monogr. Helic. 
Vivent. ill. p. 264°. 
Helix (Polygyra) couloni (Shuttl.), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 282°. 
Anchistoma couloni (Shuttl.), H. & A. Adams, Gen. Moll. ii. p. 282°. 
Polygyra couloni (Shuttl.), Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 46, t. 3. fig. 4°. 
Hab. E. Mexico: Cordova, probably collected by Jacot-Guillarmod1~+; Environs of 
Jalapa (Dona Estefania®); Maltrata, on the Mexico and Vera Cruz railway, a 
little west of Orizaba, woody hills (Hége). 
Centrat Mexico: Sayula in the State of Jalisco, Mexico city, and Cuernavaca, 5. of 
the city of Mexico (//6ge). 
S.W. Mexico: Omilteme, State of Guerrero (47. H. Smith). 
