502 



PROCEEDINGS OF THE ACADEMY OF 



[Nov., 



nearly effaced, spiral incised lines well developed above the periphery. 

 Umbilicus wider than in granulatissima. 



Alt. 10, diam. 19 mm. ; whorls 4^. 



The animal is slaty-blackish, the back paler, brownish-gray, collar 

 of mantle dark slate. The sole is slate colored at the sides, the middle 

 gray, but the areas are not bounded by lines. The lung has faint 

 venation ; pulmonary vein breaking up into several large branches. 



Fig. 3. Jaw and teeth of a cotype of Sonorella danielsi. 



Genitalia.— -The penis is very large, stout, subcylindric, half the 

 length of the vagina or longer. It collapses at the base, where not 

 filled by the papilla, and has several strong longitudinal folds inside. 

 It contains a long cylindric papilla which is abruptly truncate at the 

 end and wrinkled throughout. There is no flagellum. The long 

 vagina is rather slender throughout, with an annular swelling or node 

 about midway of its length. It is longitudinally rugose within, the 

 rugae coalescent at the node. Other organs as usual. Fig. 7 was 

 drawn from a drowned specimen which had not been in alcohol (No. 

 94,318). 



The jaw has six or seven very low, wide ribs, parted by narrow 

 intervals. The radula has about 47, 1, 47 teeth. In most rows the 

 fifteenth tooth has an ectocone. No marginal teeth with the ectocone 

 bifid were seen. The nineteenth tooth, in the radula figured, is abnor- 

 mal. One of the outer marginals is shown above it. 



Types No. 94,318 A. N. S. P., from head of Bear Canyon; also 

 Miller Peak and east fork of Cave Creek. 



Similar forms, but with the ground-color not yellow but pale brown 

 (as in granulatissima), occur in Ida Canyon, Cave Creek and Ash 

 Canyon (pi. XIX, fig. 18). 



This species replaces granulatissima on the south side and east end 



