DIPLOMMATINA. 121 
Operc. testaceum, multispiratum, sutura inconspicua. — Diam. 
galt 19! /, amll. 4B: 
Cyclostoma constrictum DBens. in Ann. and Mag. 2d. ser. VIIL. 1851. *) 
Alycaeus constrictus Pfr. Consp. N 177. 
Habitat ad Darjiling Himalayae Sikkimensis. 
Vill,  Diplommatina Benson. 
Opereulum subtestaceum, tenue, anfractibus paucis, extus 
lamella tenui, prominente marginatis. Testa vix rimata, tenuis, 
subovata; apertura subcircularis; peristoma interruptum, ex- 
pansum. 
Diplommatina Bens, in Ann. and Mag 1849. Sept. p. 193, **) 
— Gray Catal. Cycloph. p. 54. 
— Pfr. in Zeitschr. f. Malak. 1851. p. 147. Consp. p. 19. 
Carychium (spec.) Hutton mss. 
Bulimus (spec.) Pfeiffer olim. 
Cyclostoma (spec.) Somerby. 
1. D.? Sowerbyi Pfr. 
T. subimperforata, ovato-oblonga, tenuissima, laevigata, 
nitida, lutescenti-hyalina; spira ovata, apice obtusa; anfr. 5 
turgidi, supremi costulati, penultimus latissimus; apertura ver- 
ticalis, subcireularis; perist. album, breviter expansum, mar- 
ginibus fere contiguis, columellari medio angulatim dilatato. — 
Operc.? — Long. 5?/, diam. medio 3'/, mill. Ap. 2 mill. 
longa. (Coll. Nr. 82.) 
*) This shell has apparently an affinity with the Philippine C. minus 
Somerby , but differs in its more tapering form, smaller size, perforation, 
diverse sculpture, and in the strangulation of the last whorl behind the 
aperture, in which feature it exhibits an approach to the more shortened C. 
gibbum Fer. from "Turon in Cochinchina, and to the depressed C. stran- 
gulatum Hutton, so abundant in the more western portion of the Himalaya. 
(Bens. l. c.) 
**) CI. Benson operculum non observavit, quod tamen in copiosis 
Musaei Britannici speciminibus adest, et ideo genus familiae Carychiadarum 
adnumerat. Animal characteribus: externis (se. positione oculorum, a Cyelo- 
stomaceis non: discrepat, quamobrem praecedente Cl. Gray genus hic recepi, 
ineluso dubioso C. minore Som. 
