— 112 — 



Dmm. maj. 2 3/4, min. 2 1/4, ait. vix 3 mill. (Coll. 

 Grosse.) 



Habitat in vicinio civitatis Nouméa dictœ, Novœ Cale- 

 doniœ. (E. Marie.) 



Obs. Species parvula, cœteris Novœ Caledoniœ Helicinis, 

 hactenus notis, magis turbinata et spira elatiore distin- 

 guenda. 



16. Hydrobia Gentilsiana, Crosse. 



T. imperforata, ovato-oblonga, tenuiuscula, translucida, 

 sublœvis, sub epidermide pallide olivaceo-cornea, tenaci, 

 sordide albida; spira sat elevata, apice obtusulo ; sutura 

 impressa; anfr. 4 1/2 conveœi, subinflati, ultimus spiram 

 subœquans^ descendens^ antice leviter solutus, basi rotun- 

 datus ; apertura subverticalis, oblique angulato-ovata , 

 intus albida ; peristoma continuum^ subsolutiim, crassius- 

 culum, sordide albidum. — Operculum castaneum. 



Long. 3, diam. maj. 1 1/2 mill. (Coll. Crosse.) 



Habitat in loco Oubatche dicto^ prope Pouébo, Novœ Ca- 

 ledoniœ : in flumine, ad 300 metr. altitudinem, specimina 

 3 collecta sunt (Gentils). 



Obs. Genus in Nova Caledonia hactenus nondum re- 



pertum. 



H. G. 



Diagnoses Iflolluscoruni in fluminibus provinclee 

 IVankinseiisis COliectorum, 



AuGTORE R. p. Heude S. J. 



i. Unio Pfisteri, Heude. 



T. oblonga, tenuiuscula^ subcompressa, inœquilateralis, 



