SHALLOW-WATER STARFISHES 273 



all from northern Alaska and Bering Sea, in 41 to 344 fathoms, 

 except one, from the Straits of Fuca, in 100 fathoms. 



It is found on both coasts of the North Atlantic, in 10 to 530 

 fathoms. On the East American side it ranges south to Cape Cod. 

 Common in the Bay of Fundy, in 10 to 50 fathoms. On the 

 European side it extends south to Norway, Scotland, and England. 

 Common in Barents Sea, Spitzbergen, Kara Sea, Greenland, etc. It 

 is evidently circumpolar in distribution. 



Some of Dr. Fisher's specimens were unusually large. He gives 

 the radii of one as 33 mm. and 75 mm. ; ratio, 1 : 2.2. 



PTERASTER PULVILLUS M. Sars. 



Pteraster puhillus SARS, Overs. Norges Echinod., p. 62, pi. vi, figs. 14-16, pis. 

 vii, vni, 1861. Verrill, Amer. Journ. Sci., xvi, p. 371, 1878; Distrib. 

 Echinod., p. 202, op. cit., 1895. Fisher, op. cit., 191 ib, p. 358, pi. en, 

 figs. 2, 4. 



Two specimens of this Arctic and North Atlantic species are 

 described by Fisher from off Bering Island, in Bering Sea, in 72 

 fathoms. 



On the eastern American coast it is rare. It has been taken off the 

 coasts of New Hampshire and Maine, and in the Bay of Fundy, in 

 20 to in fathoms, and northward to the Grand Banks. It has been 

 recorded from the Arctic Ocean, Barents Sea, Kara Sea, Spitz- 

 bergen, etc. On the European coast it ranges southward to Norway. 



PTERASTER MARSIPPUS Fisher. 



Pteraster marsippus FISHER, op. cit., 1910, p. 168; op. cit., 191 ib, p. 352, pi. 

 c, fig. I ; pi. ci, fig. 2 ; pi. cxv, fig. 4 ; pi. cxvi, fig. I. 



A large, stellate, five-rayed species. Radii, 40 mm. and 100 mm. ; 

 ratio, i : 2.5. 



Dorsal membrane thick, smooth, without many prominent paxillary 

 protrusions, but with a few calcareous spicular deposits. It has so 

 few or small spiracles that they were not visible, as preserved. 



Adambulacral combs, proximally, have five spines with strong web 

 and sacculus extending beyond tips. A longitudinal, narrow web 

 between successive combs, at the outer border. 



Tube-feet crowded so as to appear to be in four rows, except in 

 young. 



Bering Sea, in 52 to 351 fathoms, southward to the Aleutian 

 Islands. 



This species, in the partially four-ranked arrangement of the tube- 

 feet, approaches Diplopter aster. 

 19 



