DIPLOMMATINA. 
121 
Operc. testaceum, multispiratum, sutura inconspicua. — Diam. 
2, alt. 3'/ 2 mill. (B.) 
Cyclostoma constrictum Bens, in Ann. and Mag. 2d. ser. VIII. 1851.*) 
Alycaeus constrictus Pfr. Consp. N. 177. 
Habitat ad Darjiling Himalayae Sikkimensis. 
VIII. Diplommatina Benson. 
Operculum sub testaceum, 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. 
Cy clo stoma (spec.) Sower by. 
1. D.? Sowerbyi Pfr. 210 
T. subimperforata , ovato-oblonga , tenuissima, laevigata, 
nitida, lutescenti-hyalina ; spira ovata, apice obtusa; anfr. 5 
turgidi, supremi costulati, penultimus latissimus ; apertura ver- 
ticals, subcircularis; perist. album, breviter expansum, mar- 
ginibus fere contiguis, columellari medio angulatim dilatato. — 
Operc.? — Long. 5 2 / 3 , diam. medio 3'/ 3 mill. Ap. 2 mill, 
longa. (Coll. Nr. 82.) 
*) This shell has apparently an affinity with the Philippine C, minus 
Sowerby , 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. 1. c.) 
**) Cl. Benson operculum non observavit, quod tamen in copiosis 
Musaei Britannici speciminibus adest, et ideo genus familiae Carychiadarum 
adnumerat. Animal characteribus externis (sc. positione oculorum) a Cyclo- 
stomaceis non discrepat, quamobrem praecedente Cl. Gray genus hie recepi, 
incluso dubioso C. minore Sow. 
