176 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



Several other nudibranchs and tectibranchs were collected but they 

 were not even tentatively identified. 



Subclass Prosobranchiata 



Admete couthouyi (Jay) was found sparingly. Two young speci- 

 mens from 453 feet are typical couthouyi, but others are quite variable. 

 A. middendorffiana Dall was taken infrequently: at Eluitkak Pass, 

 through the ice at 162 feet, and at other depths to 741 feet. A single 

 specimen of Admete regina Dall was taken at 522 feet. Two types 

 of tgg capsules of Admete were collected. 



Five living Ptychatractus occidentalis Stearns were taken from 341, 

 438, and 453 feet. 



Two living Pyrulofusus deformis (Reeve) were dredged, one 142 

 mm. long, on September 15, 1948, at 130 feet; the other 35.9 mm. 

 long, on August 17, 1949, at 438 feet. 



Eleven specimens of Volutopsius behringi kobelti Dall were taken 

 at Eluitkak Pass and from depths of 80 to 522 feet, seldom more than 

 one per haul, although three were taken at 216 feet and two at 184 

 feet. Although Point Barrow is the type locality of Volutopsius 

 sfcfanssoni Dall, only two empty shells were found. An empty egg 

 capsule of the helmet-shaped Volutopsius type and of a size worthy 

 of stefanssoni washed ashore on October 21, 1949. 



Five living specimens of Beringius stimpsoni (Gould) were dredged 

 at depths of from 125 to 522 feet. Egg capsules of a species of 

 Beringius containing from one to three large embryos with their shells 

 consisting of several whorls were taken shortly after the ice went out, 

 and freshly deposited capsules were taken in the middle of October. 

 This variation in age of embryos at the beginning and end of the 

 open season suggests the possibility of two species or of two age groups 

 of adults or, more likely, that the embryos spend the entire winter 

 developing and are then ready to emerge as young snails as soon as 

 the ice goes out. 



Two specimens of Plicifusus kroyeri (Moller) were dredged in 

 the rubble zone. Some egg capsules possibly of this species contained 

 recently deposited eggs on October 14, 1949, and others contained 

 from 5 to 9 young snails 3 mm. in length. Plicifusus verkruzeni 

 Kobelt and Colus spitzhergensis Reeve were taken sparingly from 

 depths from 125 to 522 feet. 



Two unnamed species of Neptunea and Neptunea ventricosa 

 (Gmelin) were taken sparingly in the rubble zone. Old shells were 

 usually inhabited by hermit crabs. These shells, even those occupied 



