1905.] NATURAL SCIENCES OF PHILADELPHIA. 223 



creek, near Roswell, in the Pecos Valley, New Mexico (Nautilus, 

 XIII, p. 84), but the specimens, now in my possession, proved to be a 

 form of P. texasiana, near P. t. texasensis. This is farther west than 

 any previous record of P. texasiana. 



ASHMUNELLA Pils. and Ckll. 



Pilsbry and Cockerell, Proc. Acad. Nat. Sci. Phila., 1899. p. LS8; Nautilus, 

 XII, p. 107; Pilsbry, Proc. Acad. Nat. Sci. Phila., 1900, p. 107; Ancey and 

 Murdoch, Journal of Malacology, VIII, 1901, p. 73. 



Helicidae with a Polygyra-like or Triodopsis-Yike shell, always umbili- 

 cate and with a reflexed or recurved lip; aperture with to 4 teeth. 

 Genitalia with, on the c? side, a short or moderate penis, an extremely 

 long epiphallus, and an excessively short flagellum; 9 side with a 

 moderately long or very long spermatheca duct, but slightly or not 

 dilated at the distal end ; other organs as usual ; no dart-sack, mucous 

 glands or other accessory organs. Right eye-stalk retracted between 

 the branches of the genitalia. Penis retractor muscle with a very long 

 or double insertion near the base of the epiphallus, inserted distally 

 on the lung-floor. Jaw ribbed. Teeth of the ordinary Helicid type, 

 about 10 on each side being laterals. 



Type A. rhyssa 7niorhyssa. All known species are from the moun- 

 tains of New Mexico and southeastern Arizona. 



Only two of the 15 species and 10 subspecies now known had been 

 recognized prior to 1895, and but one of these was published at the time 

 the last treatise on American land snails was issued, Binney's Manual 

 of American Land Shells, 1885. The literature of the group is scattered 

 through many volumes of several periodicals, and a large majority of 

 the species have not been figured. In making substantial additions to 

 the group, it seems timely to review and systematize the data accumu- 

 lated. 



The soft anatomy has proved to conform closely to the generic char- 

 acters originally set forth. Ten species and varieties have now been 

 dissected by myself and one additional by Mr. Murdoch, none of them 

 diverging in any important respect. The proportions of the organs 

 vary in the several forms, showing specific variation and affording valu- 

 able cliies to the affinities of the species. To utilize these data it is 

 necessary to give the measurements of the organs, readily obtained by 

 pulling them out straight.' The measurements of the genitalia of 

 ten species of Ashmunella follow : 



* The comparative lengths of the organs are not materially altered by different 

 degrees of contraction owing to different methods of preservation ; and even the 

 absolute dimensions are less affected than might be supposed. All but one of 

 the dissections noticed herein were made from drowned specimens preserved in 

 alcohol, with but little contraction. 



