THE NAUTILUS. 1 \ f, 



Reinhardt described another, C. trochulus, from Texas. I do not 

 know that this has ever been noticed by any subsequent writer. 



Finally, Dr. V. Sterki, that indefatigable observer of small shells, 

 whose researches have added so much to our knowledge of American 

 iniand mollusks, described a toothed Conulus, the first dentate form 

 of the genus known, as G. fulvus var. dentatus. 



The shell figured by Binney in the Manual of American Land Shells 

 (p. 67, fig. 26), is evidently C. fulvus. It will be noticed that he re- 

 cords considerable divergence in dentition between the observations of 

 various observers, Morse giving 18-1-18 as the formula of teeth, with. 

 7 laterals on each side ; Binney, 30-1-30, with 8 laterals, and Lehmann, 

 25-1-25. This, as Binney remarks, is more variation than often, if 

 ever, occurs among individuals of one species, especially in view of 

 the comparatively small number of teeth. The difference between 

 the two American observations is 24 teeth in a row, the totals being 

 61 (Binney) and 37 (Morse). This probably indicates that two dif- 

 ferent species were under observation by the two observers. Unfor- 

 tunately the limited time at my disposal, and the limited number of 

 specimens with the soft parts dried in, has prevented me from exam- 

 ining the dentition, which I hope to do when more abundant material 

 collected alive and with the animals dried in, is available. We may 

 now notice the American forms in detail. 



Conulus fulvus i3Iuller). 



The species was originally based in part upon a larger shell of the 

 genus Hygromia, but authors agree in considering as the true fulvus 

 a shell much less elevated than chersinus, with five whorls, not so closely 

 coiled as in the several forms of chersinus, the last one distinctly 

 angular in front, the angle disappearing on the latter part of the 

 whorl ; base convex, indented and minutely perforate or subperforate 

 at the axis. Distinguished from chersinus and its varieties by the 

 fewer, wider whorls and generally less elevated contour. Helix 

 egeno, Say seems to me to be equivalent to fulvus. It is widely 

 distributed over the northern half of the Union and Canada. The 

 Rocky Mountain and California C. fulvus seem to be nearly typical 

 fulvus, though slightly diverging forms are present. 



Conulus fulvus mortoni (Jeffreys). 



Rather more depressed, the periphery of the last whorl distinctly 

 carinated throughout; whorls about 4|. Described from England. 



I This journal, Vol. VII, p. 4 (May, 1893). 



