HYDROCENA §. 1. 
157 
6. H. albescens Pfr. 
T. subperforata, ovato-conica, solidula, sublaevigata, albida 
vel pallide lutescens ; spira convexo-conica, apice acuta ; anfr. 6 
convexiusculi , ultimus spira paulo brevier, infra medium ob- 
solete subangulatus , basi rotundatus ; apertura subverticalis, 
angulato-ovalis; perist. simplex, rectum, margin e columellari 
calloso, subappresso. — Long. 7, diam. 4 mill. Ap. 3 mill, 
longa, 2 lata. (Coll. Nr. 333.) 
Hydrocena albescens Pfr. in Proc. Zool. Soc. 1854. p. '306. n. 8. 
— //. et A. Adams Gen. rec. Moll. II. p. 299. 
Habitat in insula Opara. 
7. H. solidula Pfp. 
T. subperforata, ovato-conica, solidula, sublaevigata, irre- 
gulariter erosa, haud nitens, cerea ; spira convexo-conica, apice 
acuta; anfr. 6 subplani, ultimus spira paulo brevior , obsolete 
angulatus, basi convexiusculus ; apertura verticalis , angulato- 
ovalis; perist. simplex, rectum, margin e columellari subincras- 
sato. — Long. 6, diam. 4 mill. Ap. 2 2 / 3 mill, longa, 2 lata. 
(Coll. Nr. 334.) 
Hydrocena solidula Pfr. in Proc. Zool. Soc. 1854. p. 305. n. 5. 
- H. et A. Adams Gen. rec. Moll. II. p. 299. 
f. Minor, rubella, angulo peripherico distinctiore. 
Habitat „Lord Hood’s Island. 44 
8. Iff. oeeaniea Jaequiiiot f 
T. subperforata, oblongo-conica, laevigata, pallide lutes- 
cens; spira convexiusculo-conica , acuta; anfr. 5 1 / 2( convexi, 
ultimus spira brevior, supra medium obsolete angulatus; aper- 
tura ovalis ; perist. subcontinuum, rectum, margine columellari 
dilatato. — Long. 5, diam. 2 mill. (Ex icone.) 
Cyclostoma oeeaniea Hombr. et Jacq. Voy. Pol Sud. Zool. V. p. 48. 
t. 12. f. 4 — 6. 
Habitat in insula Vavao. 
9. Iff gutta Sliuttlewortli. 
T. subimperforata, globoso-ovata , solidula, laevis, niti- 
diuscula, pellucida, flavo-rufescens ; spira elata, obtusula; anfr. 
3*/ a — 4 convexi, ultimus spiram subaequans, rotundatus; aper- 
tura obliqua, semicircularis ; perist. simplex, rectum, margine 
columellari callo nitidissimo diffuso ornato. — Operc. conco- 
