74 PROCEEDINGS OF THE ACADEMY OF [Feb., 
Measurements of 152 shells from six stations foilow: 
Diameter in Near 
mm. Sta. 1. Sta. 4. Sta. 2. Sta. 5. Sta. 9. Sta. 14. 
— 
o 
> meWENRONNE 
bo 
o 
bo 
or 
— 
FRO vay kt eae mee ee 
— 
Li) 
o 
~I 
or 
bo bo 
—_ 
Cal — yen SD macs on NSE SAO Py Cr a ee 
_ 
— 
bo 
wo 
no 
On 
bo bo bo 
SH Onwreowosn: : 
bo 
OC) 
~J 
or 
: poco: Com: 
pet: 
25.25... ig as: a a 
No. of shells... 25 15 8 26 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 
(pl. 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 14 convex whorls; 
after the smooth apex, there are a few arcuate radial ripples; and the 
