IIYDROCENA §. 1 — 3. 
173 
circularis; perist. simplex, rectum, ad anfr. contiguum brevis- 
sime interruptum, margine sinistro vix reflexiusculo. — Long. 2, 
dlam, 1 mill. (Coll. Nr. 516.) 
Hydrocena Purchasi Pfr. in Proc. Zool. Soc. 1861. p. 1.50. 
Habitat „Bay of Islands^ Novae Seelandiae (Purchas, 
Hochstetter). 
14, Milium Bens. •}• (India, Conf. genus Georissa.) Pneum. II. p. 158. ]049. 
§. 2. 
15, exserta Pfr, (Shanghai.) - - - 158. ]050. 
16. M. ? Pease, f i05i. 
T. imperforata, pj^ramidalis, vitrea, rubenti-cornea, longi- 
tudinaliter costata : costis irregularibus (ultra 20), prominenti- 
bus, interstitiis concavis , iongitudinaliter minutissime striatis ; 
anfr. 6 rotundati, sutura profunda separati; apertura angulato- 
ovalis; labrum album, continuum , anfractui contiguo non vel 
breviter adnatum. -- Long. 7, latit. 31/2 mill. (P.) 
Cyclostoma taJidensls Pease in Proc Zool. Soc. 1861. p. 243. 
Habitat Huaheine. 
O b s. Num revera hue pertinens ? 
17. obtusa Pfr. (Habitat?) Pneum. II. p. 159. 1052, 
18. oblonga Pfr, (Coll. 517. — - Ins. Marquesas.) - - - 159. io53. 
19. pyramis Pfr. (Singapore.) - - - 160. 1054. 
20. Cattaroensis Pfr. Coil. 518. — Dalmatia.) . - - _ 16O. 1055. 
21. minutissima Sow. (Coll 519. — Ins. Pitcairn.) - - - 160. 1056. 
22. exigua Jacq. f (Ins. Mangareva.) - - -161. 1057, 
§. 3. 
23, M. ? iiratsa, Moreiet. 1058. 
T. subperforata, ovato-conica , solida, spiraliter conferte 
striata, epidermide saturate violaceo-fusca induta ; spira conica, 
apice erosa; anfr. distincti 3 — 4, ultimus spiram superans, infra 
suturam impressus et liris nonnullis fortioribus notatus, basi 
subangustatus ; apertura subveriicalis, semiovalis ; perist. simplex, 
margine dextro recto, columellari subdilatato, appresso. — 
