178 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



30 percent empty shells, were taken from Eluitkak Pass and at depths 

 of 100 to 741 feet. The sand-encrusted egg rings of this species ap- 

 peared in the first dredge hauls of the open season and one that was 

 taken on October ii, 1949, at 453 feet had one young snail in each 

 egg space. 



A few specimens of Polinices pallidus Broderip and P. monteronus 

 Dall were taken at depths ranging from 120 to 741 feet. Egg collars 

 of Polinices were dredged and others were washed ashore. A few 

 small ones could be attributed to the above species, but the majority 

 were so large that it did not seem possible they could belong to 

 monteronus or to pallidus of the size that was collected. Another 

 species may live farther from shore or larger pallidus may occur in 

 deeper water or at some place outside the dredging area of this 

 project. 



One species of Onchidiopsis, possibly glacialis M. Sars, and three 

 species of Velutina were taken in the rubble zone, mostly in the 400- 

 foot range. Another Velutina was collected near shore and from the 

 beach. 



Lepeta caeca Muller occurred on rocks from depths of 125 to 477 

 feet, the majority being found at 217 feet or deeper. The body of 

 the animal is white. 



A few specimens of the tiny liotiid Molleria costulata (Moller) 

 came from 453, 477, and 741 feet. 



The trochids were well represented by Solariella obscura (Cou- 

 thouy) and Margaritopsis grosvcnori (Dall) from the rubble zone, 

 mostly from depths up to 216 feet; Margarites vahli (Moller) from 

 120 to 741 feet; Margarites pribiloffensis Dall from 477 and 741 feet; 

 and two specimens of Margarites vorticiferiis ecarinatus Dall from 

 217 and 341 feet. But much larger and more abundant than all the 

 other trochids together was Margarites costalis var. grandis that oc- 

 curred in hauls from no to 741 feet, the highest yields coming from 

 341, 453, and 420 feet. Several of these species are new to Point Bar- 

 row. On the basis of abundance of snails and corresponding abun- 

 dance of egg masses, it seems possible that the tgg masses so com- 

 monly found on the washerlike bryozoan Alcyonidium disciforme may 

 belong to this abundant species of Margarites, In describing the egg 

 masses of M. cinereus from east Greenland, Thorson (1935a) states 

 that they "are laid on Laminaria leaves or other algae as flat, slimy 

 plates." The egg masses on Alcyonidium might better be described as 

 firm, jellylike masses. In the absence of algae at Point Barrow it would 

 not be strange if Margarites chose to deposit eggs on the abundant 

 Alcyonidium. 



