OCR Text |
Show 1880.] LAND-SHELLS O F M E N T O N . 107 whorl in a very remarkable way ; umbilicus narrower, &c. I only found a few specimens in deposit D. Diam. 9-§, alt. apert. 3|, alt. 3| (from apex to base of aperture) millim. Type var. Indian Mus. Calcutta; also in coll. Williams. HYALINA FODEREANA, Bourg. MS. I will not attempt to describe this species, as it is too close to many species of the group of Hyalina lucida, blauneri, &c, several of which I do not possess for comparison ; I will only say that the species is everywhere abundant in deposits A, B, C, D, with the preceding, from which it is undoubtedly quite distinct. W e did not find recent specimens of this form. Alt. 5^, diam. \2\; apert. alt. 4f, lat. 6 millim. M. Bourguignat informs me that I sent him some recent specimens from Menton ; but they were certainly not identical with this subfossil species. HYALINA, sp. 1 A small species of five whorls, apparently full-grown, of which I found some half dozen specimens in deposit F only. It is a little more narrowly umbilicate than young Hyalina maceana oi the same size ; the whorls increase very gradually and regularly, the last one not being dilated. Alt. 3^, diam. 7 millim. Indian Museum, Calcutta, only. HYALINA MENTONICA, n. sp. (Plate XIII. fig. 3.) T. parva, spira elevata, anguste perforata, subobsolete striatula^ cornea, nitida ; anfract. 6, convexiusculi, regulariter pergrada-timque crescentes, ultimo paululum compresso, prope aperturam angu&to (haud dilatato), basi convexo ; apertura fere rotunda, marginibus regulariter rotundatis ac subincrassatis. Alt. 3^, diam. 5f millim. A pretty little species, quite unlike any I know, and also unknown to M. Bourguignat. Mr. Williams found one or two recent specimens at Sainte-Agnes, about 2500 feet. It is a true Hyalina, and does not belong to Vitrea; the very narrow last whorl, not dilated at all, the narrow perforation, rounded aperture, elevated spire, &c. well characterize it. The figure is not good, and the shell has been since accidentally broken. Type, Indian Museum, Calcutta. HYALINA (VITREA) TENEBR^RIA, Bourg. MS. I will not attempt to describe this small form of a most difficult group, for which I have not at the moment the proper material available. It is an imperforate species, with remarkably excavated base It was rather scarce (subfossil) in deposits A, B, and D. M. Bourguignat informs me he possesses recent specimens of the species from a grotto near Grasse. |