124 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



Pass and at depths of about 125 to 741 feet. One dredge haul from 

 Eluitkak Pass yielded 20 specimens of this worm, which nestled be- 

 tween the abundant growths of barnacles and no doubt fed on them. 

 Thick growths of bryozoans and of the octocoral Eunephthya rtihi- 

 formis also provided refuge for it. In life Notoplana atomata is light 

 beneath and rosy tan above, the latter color produced by minute tan 

 spots. Internal opaque white spots show through the dorsal surface. 

 Although this is the commonest polyclad of northern shores of the 

 North Atlantic, both in Europe and America, it has not previously 

 been reported from western Arctic shores. 



A new species of polyclad, Acerotisa arctica Hyman, was found 

 only rarely : 2 specimens on October 6, 1949, at 295 feet, i on Septem- 

 ber I, 1949, at 328 feet, and i on October 11, 1949, at 453 feet — all 

 on stony bottom. It is pale red, with a deeper red longitudinal band 

 through the middle. 



Both of these species, with a description of the new one, are in- 

 cluded in a recent publication by Hyman (1953). 



Class CESTODA 



Since parasitology is a study in itself, no search was made for tape- 

 worms, but any that were found were preserved. Specimens up to 

 600 mm. in length and from 3 to 4 mm. in width were taken from the 

 intestine of a bearded seal, Erignathus barbatus (Fabricius). An- 

 other much smaller species was found by the hundreds at the edge of 

 the water and on the bottom of a fresh-water pond near the Point. 

 They had obviously come from bird droppings, and since dozens of 

 loons were on the water and flying around, no doubt this bird is the 

 secondary host of the tapeworm. 



Phylum NEMATODA 



Free-living nematode worms were abundant and many of them 

 were unusually large. They could be found among bryozoans and 

 hydroids, in the interstices between individuals in a colony of barna- 

 cles, in the mud and debris in holes in rocks, in the growth on rocks, 

 and in more specialized habitats. Specimens of the jell-like cylindrical 

 bryozoan Alcyonidium enter omorpha Soule were somewhat wrinkled 

 longitudinally and within these wrinkles several nematodes were 

 ensconced. Others were found at the bases of the simple tunicates 

 Chelyosoma macleaynmn and Molgula griffithsi. Still others were 

 found between colonies of the compound ascidian Didemnum albidum 

 and the worm tubes (Pista maculata) on which they were growing. 



