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. terasiana, near P. t. terasensis. 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. 188; Nautilus, 
XII, p. 107; Pilsbry, Proc. Acad. Nat. Sci. Phila., 1900, p. 107; Ancey and 
Murdoch, Journal of Malacology, VIII, 1901, p. 73. 
Helicide with a Polygyra-like or Triodopsis-like shell, always umbili- 
cate and with a reflexed or recurved lip; aperture with 0 to 4 teeth. 
Genitalia with, on the o side, a short or moderate penis, an extremely 
long epiphallus, and an excessively short flagellum; ° 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 miorhyssa. 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 clues to the affinities of the species. To utilize these data it is 
neccssary 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: 
1 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. 
