6 University of MicJiigan 



be seen in the figures (22 and 23) ; in fact, they do not vary 

 as much as in different individuals of exigmmi. 



The discovery of other individuals as small and distinctive 

 in characteristics will be awaited before naming this peculiar 

 form. 



Carychimn exile ? 



A single specimen collected by the writer at Harriman, Ten- 

 nessee, in wet grass at the foot of Walden Ridge, combined 

 characters of exile and exiguum in a striking way. It is a 

 very coarsely ribbed, small shell, having, however, the obese 

 body whorl, and relatively small lamellae of exiguum. It is 

 figured before and after opening, in order to show the profile 

 contour. Clapp, in his description of C. nannodes, mentions 

 a coarsely ribbed exile found with that species, and it seems 

 possible that this is that form, but the internal lamellae are 

 so distinctly those of exiguum that it is placed with exile only 

 tentatively. Further southern material should be examined in 

 order to clear up this apparently anomalous combination of 

 characters. 



It would probably be interesting to examine the lamellae of 

 the remaining United States species of Carychium, and deter- 

 mine whether varietal differences are borne out in other cases 

 as they seem to be in the case of exile and exile canadense. 

 The varieties jamaieensis, ■Horidanum and mexicantmi of exi- 

 gtmm and the Kentucky C. stygium might be examined with 

 profit. 



The following short list is published as an aid in finding 

 the original descriptions and figures of the species discussed 

 in the above paper: 



PiLSBRY, H. A. Forms of American Carychium. Nautilus, IV, 

 pp. 109-110. 1891. 



