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 (pi. 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 (pi. IV, fig. 7). A half-grown shell has very minute 

 genitalia (pi. IV, fig. 5) with a very short papilla. 



Measurements of genitalia of S. optata in mm. 



Locality 



Station 1, fig. 3 



Station 4, fig. 4 



Station 3, fig. 1 



Near Station 3, fig. 2 

 Station 5, fig. 7 



si 



a 



'3. 



a 



3.3 



3.5 



5 



5 



2.75 



a 

 o 

 fa 



10 + 

 7.5 



long 



OJ <s> 



a to 

 03 



25 



25.5 



18.5 



19.5 



20 



o 

 6 



3 



94,319 

 94,321 

 94,322 

 94,320 

 94,323 



Sonorella bowiensis Pils. PI. I, figs. 13-16. 



Sonorella hachitana bowiensis Pils., Proc. A. N. S. Phila., 1905, p. 260, pi. 

 XVIII, figs. 29-32 (shell); pi. XX, figs. 10, 11 (genitalia) ; pi. XXIII, fig. 

 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 2^ to 3 whorls, and has a very faint paler border below, 

 hardly visible; no noticeable pale border above the band. Whorls 



