1910.] NATURAL SCIENCES OF PHILADELPHIA. 65 
crop and foregut are longitudinally sulcate. Salivary glands long, 
united over the upper surface of the crop. 
The form from north side of Big Emigrant Mountain (Station 3, 
No. 94,322) is similar. Genitalia (pl. IV, fig, 1) with long penis- 
papilla, its end long-conic. Flagellum a barely perceptible bud bound 
in the integument. Lung with venation typical or (in one of several 
examined) the pulmonary vein has a large branch on the cardiac 
side, where the venation is otherwise very faint. Length of lung 27, 
of kidney 14, of pericardium 4.5 mm. (fig. 4, left fig.). The crop and 
foregut are deeply sulcate longitudinally. No. 94,320, from west side 
of Big Emigrant Mountain are similar. As usual in this species, the 
penis-papilla has a somewhat glans-like end (fig. 2). 
No, 94,323, from summit of Cross J Mountain, has the sole pale 
in the middle, shading into gray at the sides. No flagellum. Foregut 
corrugated. The penis-papilla is obtuse, but the specimen is not 
quite mature (pl. IV, fig. 7). A half-grown shell has very minute 
genitalia (pl. IV, fig. 5) with a very short papilla. 
Measurements oj genitalia of S. optata in mm. 
| 
| 
1 3 = | @ $3 P= —| 
ee alg ee eg a. : 
Eaaleculban=: fey pi oa. Stadia ions viet 
ay am | ca = ic | 8 = = 
Station 1, fig. 3.0.00. Wat lige, ees O 8). tes |o5 “oa 315 
Station 4, fig. /4..0...:.00... 17 | 4 3.5 |vestigeal| 8 | 26 | 7.5) 25.5 | 94,321 
Station 3, fig. Lies. Paar ee eeu sien ar | 18.5 | 94,322 
Near Station 3, fig. 2......)5 [2.6] 5 S La Dae, Ui ieee a 19.5 | 94,320 
Station 5, fig. Too! 4.6|2.6| 2.75] 0 7 |... |long|20 | 94,323 
Sonorella bowiensis Pils. Pl. I, figs. 13-16. 
Sonorella hachitana bowiensis Pils., Proc. A. N. S. Phila., 1905, p. 260, pl. 
XVIII, figs. 29-32 (shell) ; pl. OG figs. 10, 11 (genitalia) : pl. XXII, ne 
22 (jaw). 
Forty-one living and twenty-eight dead adult specimens were taken 
at the type locality in 1906. It is a very pretty shell, quite constant 
in all its characters. 
The shell is somewhat transparent, pale corneous-brown becoming 
lighter almost corneous-whitish near the umbilicus. There are 
usually one or two obliquely radial whitish streaks on the last whorl. 
The chestnut band above the periphery is about one millimeter wide, 
is visible on 24 to 3 whorls, and has a very faint paler border below, 
hardly visible; no noticeable pale border above the band. Whorls 
