HELICINA $. 7. 8. 369 
vexi, ultümus rotundatus, non descendens, basi juxta callum 
columellarem cireumsceriptum profunde impressus; columella 
simplex, recedens; apertura ampla, semicircularis ; perist. sim- 
plex, tenue, expansiusculum, margine dextro vs insertionem 
quasi in alam latiusculam producto. —  Operc.? — Diam. 
maj. 9, min. vix 8, alt. 7'/, mill. (Mus. Quit et Menke.) 
Helicina alata Menke mss. 
— — . Pfr. in Zeitschr. f. Malak. 1848. p. 87. 
- —  Chemn. ed. Il. N. 54. p. 43. t. 5. f. 18—90. 
— . gpannucea Morelet "Test. noviss. I. p. 21. N. 52. *) 
Habitat San Luis in provincia Peten reipublicae Guatemalen- 
sis (Morelet), Mexico? (Menke.) 
$. 8. 
67. NÉ. simuosa Pfr. 630 
T. globoso-conica, solida, concentrice tenuiter striata, 
opaca, alba; spira conica, acuta; sutura impressa; anfr. 6'/, 
plani, ultimus subcearinatus, basi convexiusculus; apertura ver- 
ticalis, sinuoso-triangularis; columella brevis, planata, basi in 
nodum dentiformem desinens, callum tenuem emittens; perist. 
incrassatum , expansum, margine dextro repando, ascendente, 
cum tuberculo calloso in carina anfr. penultimi sinum for- 
mante. — Operc.? — Diam. maj. 16, min. 13'/4, alt. 11 mill. 
(Mus. Cuming.) 
Helicina sinuosa Pfr. in Zeitschr. f. Malak. 1850. p. 191. 
-— — . Chemn. ed. IL N. 94. t. 10. f. 7. 8. 
Habitat in republica Mexicana ? 
68. M. Lanieriana Orbigny. 631 
T. globoso-turbinata, tenuis, irregulariter oblique et con- 
fertim. concentrice striata, vix nitidula, pallide lutea; spira 
conica, acute mucronata; anfr. 7, primi plani, penultimus 
convexiusculus, ultimus subrotundatus, peripheria obsoletissime 
angulatus; columella brevis, stricta, recedens, callum tenuem 
retrorsum emittens; apertura obliqua, ovali- subtriangularis ; 
*) T. ovato-depressa, subtus convexiuscula, obtuse carinata, sub epider- 
mide membranacea transversim lamelloso-cornea, levis; anfr. 5 planulati; 
apertura semilunaris; perist. subincrassatum , acutum, pone suturam emar- 
ginatum, callo crassiuseulo aperturam integram fingente. — Diam. maj. 11, 
min. 9 mill. (Morelet l. c.) 
24. 
