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Journal de conchyliologie

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_ Uk —<br />

transversim tenuissime striata, sordi<strong>de</strong> albida, palli<strong>de</strong><br />

fusco variegata; spira elongato-conica^ apice ohtusulo ;<br />

sutura margina ta ; anfractus 6 vix convexiusculi^ emhryo-<br />

nales primi^ lœvigati, cornet^ uLtimus spira paulo minor,<br />

infra peripheriant zona albida fusco circumdato cingula-<br />

tus, basi rotundatus, striis ad occursum marginis externi<br />

evanidis; apertura subverticalis, angulato-ovata, intus<br />

luteo-albida, zona anfractus ultimi transmeante ; peri-<br />

stoma simplex, luteo-àlbidum, marginibus callo tenui<br />

junctis, columellari expansiusculo, basali et externo sub-<br />

acutis; umbilicus carina parum prominula, luteo-albida<br />

circumscriptus. — Operculum? — Long. 6 \l2,diam. maj.<br />

3 1/^r7u7/. (Coll. Grosse.)<br />

Habitat in insula Rodriguez dicta. (A. Desmazures.)<br />

Obs. Species prœce<strong>de</strong>nti affinis, sed striis spiralibus te-<br />

nuissimis, ad occursum marginis extei'ni evanidis, et zona<br />

anfractus ultimi distincta.<br />

15. Planorbis Rodriguezensis, Crosse.<br />

T. late et pervie umbilicata, <strong>de</strong>pressa, lenticularis,<br />

tenuis, translucida, sublœvis {sub lente striis incrementi<br />

vix conspicuis impressa), sub tegmento saturatiore luti<br />

luteo-albida; spira planata; sutura impressa ; anfractus<br />

3 planiusculi, ultimus rotundatus, basi planatus, circa<br />

umbilicum concavus; apertura subhorizontalis, ovato-ro-<br />

tundata, intus albida; peristoma simplex, albidum, mar-<br />

ginibus callo albido junctis.—Diam.maj. 3 1/2, min. 2 3/4,<br />

ait. 1 mill. (Coll. Crosse.)<br />

Habitat in insula Rodriguez dicta. (A. Desmazures.)<br />

H. G.

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