CISTULA §. 1. 
261 
2. Anfractu ultimo antice soluto. 
a. Peristomate subsimplice . . . §.5. Nr. 16 — 19. 
b. Peristomate distincte duplicato, 
a. limbo externo piano . . . §.6. — 20 — 27. 
p. limbo externo fimbriato . . §.7. — 28 — 34. 
§• i. 
1. C.? Iilatyehila Pfr. 425 
T. perforata, ovato-conica , decollata, tenuiuscula, laevi- 
gata, diaphana, hyalino-albida ; anfr. superst. 4 convexi, sensim 
accrescentes, ultimus basi spiraliter obsolete subsulcatus; aper- 
tura verticalis, ovalis; perist. duplicatum: internum subexpan- 
sum, non prominens, externum subincrassatum, angulatim late 
reflexum, marginibus ad anfr. penultimum callo angusto an- 
gulatim junctis, columellari medio angulatim protracto. — 
Operc.? — Long. 26, diam. 16 mill. Ap. 10 r / 2 mill, longa, 
8 lata. (Mus. Gruner.) 
Cyclostoma latilabre Pfr . in Chemn. ed. II. N. 72. p. 78. 1. 10. f. 26. 27. 
— platychilum Pfr. mss. 
Cistula? plalychila Pfr . Consp. N. 380. 
Habitat . . .? 
2. C. catenata Gould. 426 
T. umbilicata, globoso-turbinata , tenuis, lineis spiralibus 
confertis, magis minusve elevatis notata, pallide rubello- cor- 
nea, fasciis angustis, interruptis, castaneis ornata; spira conica, 
integra; anfr. 5 T / 2 convexi, ultimus teres, antice breviter solu- 
tus, dorso carinatus; umbilicus apertus, angustus, pervius; 
apertura vix obliqua, angulato-ovalis ; perist. continuum, mar- 
ginibus superne angulatim junctis, subduplicatum : internum 
expansiusculum , adnatum, externum undique fere aequaliter 
dilatatum, horizontaliter expansum, superne subauriculatum. — 
Operc. typicum. — Long. 11, diam. 7 1 / 2 mill. Ap. intus 4'/ 2 
mill, longa, 3 T / 2 lata. (Coll. Nr. 186.) 
Cyclostoma catenatum Gould in Proc. Bost. Soc. I. 1843. p. 138. *) 
— — Jay Catal. 1850. p. 254. nr. 5827. 
*) T. conico - turrita, fulvo - viridescente ; anfr. 5 convexis, striis elevatis 
volventibus, fiasco articulatis ; apertura suborbiculari, anfractu penultimo 
disjuncto ; perist. reflexo , postice dentato ; operculo albo , calcareo. — 
Long, x f v lat. 2 /j poll. (Gould 1. c.) 
