202 VERRILL 



the plates must become alternate, locally. This recalls the regular 

 alternation of these plates in many paleozoic fossil starfishes. 



The species has an extensive range, from Monterey and Tomales 

 Bay, California, to Dutch Harbor and Yakutat, Alaska. According 

 to Professor Ritter, it was very abundant at the latter place on a 

 rocky reef exposed at low tide, while the young were found adhering 

 to Laminaria. It is also very abundant at Sitka and in Puget 

 Sound. 



Gulf of Georgia (Whiteaves) ; Gulf of Singio and California 

 (Perrier) ; Puget Sound and Tomales Bay (Stimpson) ; Port 

 Townsend, Puget Sound, abundant (Clark). It occurs at low tide 

 and in shallow water, on rocks. 



I have also examined specimens from near Monterey, California ; 

 Tomales Bay; Victoria; Puget Sound (Kincaid) ; Vancouver Island 

 (Canadian Geological Survey) ; Queen Charlotte Islands, etc. 



It was collected by the Harriman Expedition at Sitka, Dutch 

 Harbor, and Yakutat, Alaska. 



Family PEDICELLASTERID^ Perrier (pars). 

 Pedicellasterida Sladen, op. cit., 1859, p. 556. 



As adopted by Sladen, this family included only the genus Pediccl- 

 laster. It was distinguished from Asteriidae only by the arrangement 

 of the podia or '" sucker-feet " in two rows, instead of four. More 

 recently Perrier has added the genus Gastraster, which has some of 

 the podia in four rows. 



Genus Pedicellaster. 



Type, P. typicus M. Sars. 



Fedicellaster M. Sars, Oversigt over Norges Echinod., p. 77, 1861. Sladen, 

 op. cit., 1859, p. 557- 



Small, delicate starfishes with a reticulated dorsal skeleton, bearing 

 slender spinules ; two rows of similar marginal spines. Adambulacral 

 spines usually diplacanthid, rarely triplacanthid, or partially so. 

 Minor pedicellariae on dermis, similar to those of Leptasterias. 

 Major pedicellariae often lacking. Rays five or six ; sometimes eight. 



PEDICELLASTER TYPICUS M. Sars. 



Pedicellaster typicus M. Sars, op. cit., 1861, p. 77, pi. ix, figs. 9-17, pi. x, figs, 

 i-io. Danielssen and Koren, Norske Nordhavs-Exped., ZooL, xi, Aster- 

 oidea, pp. 36-40, 1884. Sladen, op. cit., 1889, p. 557. 



