74 



PROCEEDINGS OF THE ACADEMY OF 



[Feb., 



Measurements of 152 shells from six stations follow 



Sta. 5. 



Sta. 9. 



Sta. 14. 



1 

 2 



3 



10 



3 



2 



22 



22.25. 

 22.5... 

 22.75. 



23 



23.25. 



2 

 2 

 2 



4 

 3 



3 

 5 

 2 



1 



1 



26 



7 

 5 

 3 

 9 

 11 

 4 

 3 

 5 

 6 



i 

 i 



22 



56 



Soft anatomy. — Several specimens were dissected, from three 

 stations, 14, 4 and from near Station 1. The genitalia do not differ 

 from these organs in S. virilis circumstriata. Measurements may be 

 found on p. 72. An example from Station 4 (No. 94,331) is illustrated 

 (pi. V, fig. 5). It shows the penis kinked in a way unusual in the 

 species. 



The sole is tripartite in color, the central area, half the total width, 

 being pale isabelline, the side areas gray. The foot is gray above, 

 darkest on the back; top of the tail of a dirty yellow tint. 

 Sonorella micra n. sp. PI. II, figs. 10-12. 



The shell is small, thin, the umbilicus contained about five times in 

 the total diameter; pale brownish-corneous, a little paler around the 

 umbilicus, and with scarcely perceptible pale borders above and below 

 the dark chestnut band above the periphery; only slightly glossy. 

 Spire very low. The embryonic shell consists of 1^ convex whorls; 

 after the smooth apex, there are a few arcuate radial ripples ; and the 



