1923] NATURAL SCIENCES OF PHILADELPHIA 67 
The pallial region (Plate IV, fig. 3) shows a kidney more than half as 
long as the lung the proportion being 15 to 26mm. The pericardium 
is 4.5 mm. long. The veins of the anterior portion of the lung are 
sparsely bordered with brown dots. 
In 1919 it was collected at Stations 293, 304 and 3043. While 
some typical S. colis were taken, most of the shells are larger, up to 
25 mm. diam., and not definitely distinguishable from S. mustang; 
also very close to S. walkert. No animals were preserved, so that 
we cannot compare the genitalia of this large form, which is tem- 
porarily left with S. cotis, as there seems to be some intergradation 
in size. 
Sonorella patagonica Pils. & Ferr. Plate I, figs. 7-10; plate IV, figs. 2, 4, 6, 7, 8. 
Sonorella patagonica P. & F., Nautilus vol. 33, July, 1919, p. 20. 
Patagonia Mountains, in the southern part, Stations 253, 254, 
255, 258, 259 to 262, 264, the type from Station 254. 
The shell is very similar to S. papagorum, but in the type and 
many other specimens (but not in all) there are impressed spiral 
lines on the last whorl below the suture. The embryonic shell 
shows forwardly-descending threads, hachitana pattern, characters 
not observed in S. papagorum. 
Height 12.8, diam. 22 mm.; 4% whorls. Type, No. 43722. 
Pe etter MLO es ae SS No. 43719. 
Genitalia similar to those organs in S. papagorum, but the organs 
are somewhat longer; flagellum generally better developed, and 
the vas deferens is somewhat enlarged near the flagellum. Penial 
papilla is slender, tapering, corrugated (but in one example, No. 
43719, from Station 260, it is smooth). Measurements of the 
organs in mm. follow. 
Museum No. 43721 43722 43720 4715 48718 43733 43719 
Penis ORs Sring a1 Skoe spa Ole een Oto (OLD. 
Penis-papilla 2O:5 6.0 i coeetteael) 5.5 cokhees One 
EKpiphallus Tee rcs 25 eNO ee “OO 4) Oak 
Flagellum 0:5, 7 O15 EOstminutewace nr (On 1.0 
Vagina HO Qt 6 ore SO S0n WSO renee 
Station 258 254 -252 258 255 260 260 
While this form has considerable resemblance to S. hachitana in 
genitalia, the shell differs, being less depressed, with the last whorl 
descending less. 
The size is rather variable. Thus one lot, no. 43720, from Station 
252, includes specimens measuring from height 11.5, diam. 18.3 
mm., to 15 X 23.7 mm., together with intergrading sizes. 
