THE NATURAL HISTORY SURVEY. 183 



Radula formula: V +f + i + -f + (39 ! ~39); teeth of 

 the same type as others of the genus; central tooth longer than 

 wide, the base of attachment with widely expanded lower outer 

 corners, tricuspid, the central cusp very long and reaching 

 much below the edge of the base of attachment, side cusps 

 small; lateral teeth similar to central, bicuspid; marginals acu- 

 leate, the first one or two modified. There are about the same 

 number of rows as in hammonis. 



Distribution: Canada to Texas; Dakota to Maine and 

 Florida; "Lower California and states of Jalisco and Morelos, 

 Mexico." (Pilsbry.) Manitoba ( Hanham). 



Geological distribiition: Pleistocene; Loess. 



Habitat: Same as arboreus and hammonis. 



Remarks: This species may be distinguished from the last 

 by its subperforate umbilicus and peculiar equidistant im- 

 pressed striae. The two species, though resembling each other 

 when casually viewed, are readily separated when the charac- 

 ters are once understood. The animal is very rapid and 

 more bold than the other species. Indentata is as widely dis- 

 tributed as the last species, but is not nearly as common, only 

 a few individuals being found together. 



GENUS EUCONULUS Reinhardt. 



Conulus, FITZ, 1833; nonRafinesque, 1814 (vide Pilsbry, The Nautilus, 

 Vol. XIV, p. 81). 



"Shell: Imperforate,or very narrowly perforate, turbinate, 

 arcti-spiral; whorls 5 to 6, rather convex; aperture depressed- 

 lunar, the penultimate whorl strongly excided, somewhat ob- 

 lique. Peristome with margin separated." 



" Animal (si C. fulvus): Bluish-black upon the head, neck, 

 and eye-peduncles, lighter on the sides and base; foot very 

 narrow, thread-like. A distinct caudal mucus pore." (Bin- 

 ney.)* 



69. Euconulus fulvus Draparnaud, pi. xxviii, fig. 17. 

 Helix fulva DRAPARNAUD, Hist. Moll., 1805. 

 Helix egena SAY, Journ. Phil. Acad., Vol. V, p. T20, 1825. 

 Comtlus fulvus mortoni JEFFREYS (vide Pilsbry). (Variety.) 

 Conulus fulvus alaskensis PILSBRY, The Nautilus, Vol. XII, p. 116, 



1899. (Variety.) 



Shell: Subconical, turreted, thin, pellucid, convex above, 

 rounded below, subperforate; surface shining, smooth, marked 



*W. G. Binney, Man. Amer. Land Shells, p. 67. 



