ANCTLUS. 



141 



Hakl., but differs from it iu being more elevated, in having the lines of 

 growth coarser, and by its rosy ape.x. It is more elevated than any other 

 specimens of the genus with which I am acquainted. 



It -is somewhat singular that this should have been the only species of 

 Aiic/jlus noticed on a journey of nearly eighteen hundred miles, during 

 which every stream was examined for shells, and this genus was anxiously 

 sought for. (^Anthuny.) 



Ancylus elatior, Anthony, Ann. N. Y. Lye. VI, 158, pi. v, f. 20-21 (1855). 

 Mr. Anthony's description and figure are copied above, 



Ancylus diapleaillis, Haldeman. — Shell thin in texture, diapha- 

 nous, very wide, nearly circular, depressed ; apex obtuse, almost central ! 

 Slope scarcely convex. Color very pale olivaceous, trans- 

 lucent, aperture white. Long. 5.5, lat. 4.5, elev. 2 mill. Fig- 235. 



Discovered in Ohio, by Mr. Anthony. 



Distinguished by its circular and flattened form, and cen- 

 tral inconspicuous apex. (^Haldeman.) 



Ancylus diaphanus, Haldeman, Mon. No. 3, p. 3 of cover, 

 1841 ; p. 8, pi. i, f. 4 (1844).— DeKay, N. Y. Moll. 13 

 (1843). 



Also said to have been found in Wisconsin. 



Cat. No. I No. of Sp. 

 S5.30 



Locality. 



! From whom received. 



Remarks. 



Milwaukee, Wis. 



I. A. Lapham. 



Cabinet series. 



Ancylus haldeniani, Bocrguignat. — Shell small, oval, elliptic' 

 pale, thin in texture, depressed ; ends similarly curved, sides convex, 

 slope nearly rectilinear ; apex obtuse, with more than one- 

 third the shell behind it. Long. 4, lat. 2.5, elev. 1.5 mill. 



Houston River, in Washingt(yi County, southwestern 

 Virginia. 



Paler, more depressed, and with a less prominent apex 

 than A. rivuJaris and tardus ; posterior slope less concave 

 than in the former, and not direct, as in the latter. 

 (^Haldeman.') 



Ancylus haldeniani, Bourguignat, Pr. Zool. Soc. London, 1853, p. 83. 

 Ancylus depressus, Haldeman, Mon. 6, pi. i, f. 12 (1844). 



On the authority of Bourgnignat's Memoir on Ancylus, I. c, I 

 adopt another name for this species. There is an A. depressus 

 of Deshayes, 1824 (vide Encycl. Meth. II, 48), and of Keferstein, 

 1834. 



Fig. 23G. 



Ancylus 

 luddemani. 



