316 MOLLUSCA. 
A. Species without parietal plate. 
Achatina, part., Pfeiffer (1848); Nothus, Albers (1850) ; Spirawis, § 3, Pleiffer (1877) ; Spirazis, 
sect. II. Species Dentato-plicate, Fischer & Crosse (1877) ; Lamellazis, Strebel (1882). 
1. Leptinaria mexicana. 
Spiraxis mexicana, Pfr. Malak. Blatt. xiii. p. 84 (1866) ’; Monogr. Helic. Vivent. vi. p. 193°. 
Spiraxis mexicanus, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 617 °. 
Lamellaxis mexicanus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 109, t. 7. fig. 14 6, 
t. 17. fig. 3%. 
Nothus mexicanus, Ancey, Ann. Malac. 1886, p. 247°. 
Hab. i. Muxico: Mirador (Berendt 1, Strebel+); Rancho Guerrero, Agua Caliente, 
Camino de Obispo, Camino de Arroyo Rondo, and Rancho de San Eligio, all near 
Misantla, and the further Cafiada de Coatepec near Jalapa (Strebel +); Misantla 
({6ge). 
Honpuras: Utila Island (Simpson >). 
Var. turrita, n. 
Lamellaxis mexicanus (part.), Strebel, loc. cit. p. 111, t.7. fig. 14a, t.17. figg. 3 a, b, ¢ (right figure) *. 
Hab. E. Mexico: Agua Caliente (Strebel ®); Misantla (Strebel ®, Hoge). 
Var. abbreviata, n. 
Spiraxis mexicana (part.), Fisch. & Crosse, loc. cit. p. 617, t. 25. figg. 8, 8a, b’. 
Lamellaxis mexicana (part.), Strebel, loc. cit. p. 111, t. 17. fig. 3c (left figure) *. 
Hab. %. Mexico: Mirador (Berendt"); Agua Caliente near Misantla (Stedel §). 
2. Leptinaria martensi. 
Bulimus martensi, Pfr. P. Z. 8S. 1856, p. 8318’; Monogr. Helic. Vivent. iv. p. 451°. 
Spiraxis martensi, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 619, t. 25. figg. 9, 9a, 6°. 
Lamellaxis modestus, form B, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 112, t. 7. fig. 15, 
t. 17. figg. 5 a, 5 6 (left figure), 6 a, 7 6 (1882) *. 
Hab. i. Mexico: Cordova (Sallé!~8); Mirador (Berendt *, Strebel +). 
Var. inflata, n. 
Lamellaxis modestus, form A, Strebel, loc. cit. p. 112, t. 7. fig. 15 a, t.17. fig. 5b (right figure) °. 
Hab. E. Mexico: Misantla (Sérebel °). 
3. Leptinaria stolli, sp.n. (Tab. XVIII. figg. 9, 9a.) 
Testa ovato-globosa, rimata, tenuis, leviter striatula, pallide flavescens, nitidula ; anfr. 5, convexi, sutura modice 
impressa, ultimus basi rotundatus. Apertura subverticalis, trapezoidea, margine externo bene arcuato, 
. basali late rotundato ; margo columellaris paululum concavus, dilatatus, prope basin late truncatus et plica 
distincta circumvolutus ; paries aperturalis in testa juvenili uniplicatus. 
Long. 7, diam. 5; apert. long. 43, diam. 3 millim. 
Last whorl, seen from the dorsal side, to the whole length of the shell as 1: 13 or 5:8, 
