ANCEY : ON HAWAIIAN MOLLUSCA, 127 



infenore altero valde approximato, infra medmm sulco exili circum- 

 cinctus, basi convexus. Callum basale lividum, intus luteum, granu- 

 latum. Apertura obliqua, subtriangularis, angulo extero rotundato. 

 Peristoma simplex, rectum, margins columellari cum basali angulum 

 rotimdatum efficiente. 



Diam. maj. 6, min. 5-66, alt. 4, alt. apert. (oblique) 3-25 mm. 



Ifab.—Ki-pu, Kauai (D. D. Baldwin). 



The lai-gest species hitherto found in the Sandwich Islands, but of 

 the same general type. 



Helicina dissotkopis, n.sp. PI. VII, Figs. 22, 23. 



Testa lenticularis, utrinque depresso-convexa, solidula, subnitidula, 

 striis capillaribus incrementi sub lente oblique sculpta, acute carinata, 

 rubella, supra infraque ad callum basalem albo strigata. Spira depressa, 

 late conoidea, apice obtuso. Anfractus 4 plani, superioies exserte 

 carinati, sutura parum profunda ; ultimus superne plano-declivis, praeter 

 carinam superam altera illae approximata et interdum tertia minus 

 distincta circumdatus. Callum circumscriptum, granulatum, lividulum. 

 Apertura obliqua, supra regulariter declivis, extus angulata, basi 

 subarcuata. Peristoma acutum, basi vix expansiusculum. 



Diam. 4*2, alt. 2-25, alt. apert. (oblique) fere 2 mm. 



Hab. — Oahu (Thaanum). 



A distinct species of compressed form and with two or three acute 

 keels on the last whorl. Surely not a variety of M. Sandwichensis, 

 Souleyet, of which I have typical specimens from the Waianae 

 Mountains, Oahu (D. D. Baldwin). Some subfossil examples also 

 are in my hands from Waimea, Hawaii (Henshaw). 



Helicina sulculosa, n.sp. PL VII, Pig. 25. 



Testa parva, subgloboso-conoidea, solidiuscula, subnitens, lineis incre- 

 menti obsoletis, prope apcrturam perspicuis oblique notata, praeterea 

 sulcis linearibus distantibus 5-8 circumdata (duobus superioribus 

 anfractus superiores quoque cingentibus), rubella, concolor vel prope 

 suturam pallido maculata. Spira conoidea, acutiuscula. Anfractus 

 4, inferiores convexiusculi, sutura parum profunda ; ultimus supra 

 convexo-declivis, basi convexus, hand carinatus, ad peripheriam initio 

 vix angulatus. Callum basale circumscriptum, elevatum, tenuiter 

 granulatum, lividum, breve. Apertura obliqua, subtriangularis, extus 

 angulatim rotundata. Peristoma simplex, vix basi expansiusculum. 

 Operculum testaceum, lividum, crassiusculum, ad partem sinistram 

 anguste rubro- marginatum. 



Diam. 3*33, alt. 2'5, alt. apert. l"5mm. 



Ilab. — Olaa, Hawaii (Thaanum), 



Melania Tahitensis, Pease, var. 



JTah. — Lahaina, Maui (Baldwin). Identified by Dr. Brot, and new 

 for the Sandwich Islands. I have similar specimens received from 

 the Museum Godelfroy as collected in the Society Islands. 



