OF CONCHOLOGY. 309 



Hyalina alicea, n. sp. 



Shell depressed, planorbiform, white, rather evenly convex 

 above, and openly umbilicate beneath ; whorls 5 — 6, subcarinate 

 rather below the middle, marked by close and fine sinuate lines 

 of growth, the last whorl descending more than the others ; 

 apex scarcely above the level of the penultimate whorl ; aperture 

 rather semioval, narrowed above and produced in breadth by the 

 imperfect carination of the whorl ; lip sharp ; peristome pro- 

 duced above and retreating below ; umbilicus open, showing all 

 the whorls. Greatest breadth 8 millimetres, height 2^ mill. 



In shape, this shell approaches IT. concolor, Fer., but its color 

 is more nearly that of 31acroc7/clis concava, and in size it is 

 much smaller than either of those species. It is not altogether 

 unlike the H. skiaphila of D'Orbigny's South American shells, 

 but it differs in being flatter and in the tendency to carination 

 of the whorls. 



BLANDIELLA, n. gen. 



Testa imperforata, cylindrica, cornea, vix nitens, anfr. nume- 

 rosi, convexiusculi, leute accrescentes, sinuato-costellati ; ulti- 

 mus paulum productus ; apex obtusus, truncatus ; apertura sub- 

 ovalis ; peristoma expansum, continuum, paulum refTexum. Oper- 

 culum paucispirale, interne cartilagineum, externe calcareum, 

 rugosum. 



Testa Geomelanice similis, sed sine appendice linguiforme. 



This genus is allied to G-eomelania, from which it is distin- 

 guished by the peculiar operculum, and the want of a linguiform 

 appendage to the labrum. 



Blandiella reclusa, n. sp. PI. 17, figs. 7 and 8. 



Shell cylindrical, whitish- horny, rather solid; whorls 5 — 6 

 when adult, about 4 having been lost by truncation ; each whorl 

 adorned with about 30 fine, slightly-sinuate riblets ; peristome 

 white, shining, thickened, continuous, somewhat reflected, espe- 

 cially anteriorly. Operculum pauci-spiral, the outer surface cal- 

 careous and roughened by a series of somewhat irregular elongate 

 tubercles or ridges, highest near the outer margin ; the inner 

 cartilaginous layer forming thin edges beyond the outer layer. 

 Length of shell (exclusive of the part lost by truncation) 7 mill., 

 greatest breadth 2^ mill. 



I have examined the lingual dentition of this species, and it 

 seems to me to indicate that the proper place of the genus (prob- 

 ably with all the Acieulidce and Truncatellidce) is intermediate 

 between the Cycloplioridce and the Palitdinidce. I should, there- 



