HYDROCENA §. 2. 3. 4. 
161 
19. M. exigua Jucquinot f 
T. subperforata, ovato-coniea , striata (?), carneo-albida ; 
spira inflato-conica , acuta; anfr. 4 convexi, ultimus spiram 
subaequans; apertura acuminato-ovalis , intus rubella; perist. 
rectum ^ibcontinuum , margine columellari dilatato. — Long. 
2% , diam. 1 mill. (Ex icone.) 
Cyclostoma {exigua Hombr. et Jacq. Voy. Pol Sud. Zool. V. p. 47. 
t. 12. f. 1—3. 
Habitat in insula Mangareva. 
§■ 3 . 
20. IK. IHex Benson, f 
V T. vix perforata, ovato-acuta , minutissime striata, spi- 
raliter confertim tenuisulcata , succinea, translucente , versus 
spiram rubello-fusca ; spira nitida, elongato-conica, sutura pro- 
funda, apice obtusiusculo ; anfract. 4 valde convexis, ultimo 1 /* 
totius testae superante; apertura obliqua, ova fa , superne an- 
gulata, peristomate tenui, non continuo, marginibus conniven- 
tibus, dextro recto, acuto, columellari reflexiusculo. Qperc. 
tenui, corneo, pellucido, paucispirato, nucleo basali. — Lone-. 
2 2 / 3 , diam. l 2 / 3 mill. 44 (B.) 
llydrocena Illex Bens, in Ann. and Mag. N. H. 2d. ser. XV1T. p. 231. 
Habitat ad Phie Than vallis Tenasserim in imperio Birmano 
(W. Theobald). 
* 
21. sarrita Bens. *j- {Bens, in Ann. and Mag. 2d. 
ser. XVII. p. 231. — Cy clast. sarriturn Bens , Pfr. 
Pneum., Gray Phan. p. 224.) Mon. p. 314. 
22 . H. Pyxis Benson, f 
/>T. obtecte perforata, ovato - conica , spiraliter sulcata, 
succinea, translucente, versus spiram rubente; spira conica, 
sutura profunda, apice obtuso; anfract. 4 convexis, ultimo 2 , 5 
totius testae aequante ; apertura obliqua, semieireulari , peri- 
stomate tenui , acuto , non continuo , margine columellari ex~ 
panso, reflexiusculo. — Long. 1% diam. I 1 f 4 mill. 44 (B.) 
llydrocena Pyxis Bens, in Ann. and Mag. N. H. 2d. ser. XVII. p.232. 
Habitat ad Thyet-Mio imperii Birmani (W. Theobald). 
§. 4. 
23. liieroarlypliica Fer. fColl. 338. — Omphalotro- 
pis Pfr. in Proc. 1854. p. 307. — Jd. Gen. p. 300. 
11 
