ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 191 



Specimens examined. — Four luindreil mid sLxty-one, from the following stations: 

 Specimens of PseiidanhasIrT pusillus examirud. 



2892. 

 29090 

 2948. 



3105. 

 3187. 

 3189. 

 3191. 

 3200. 

 3202., 



4339. 

 4367. 

 4368. 

 4423. 



4430. 

 4433. 

 4533. 

 4535. 



4542. 



Santa Barbara Channel, California. 



Off Point Conception, Calitomia 



South of Santa Cruz Island, Cali- 

 fornia. 



on Half Moon Bay, California 



Off Point Sur, California 



South of I'oint Sur, California 



.do. 



Santa Barbara Channel, California. 



Monterey Bay, California 



Oil Monterey Bay, Calilomia 



Vicinity of Los Coronados Islands, 



Lower California. 

 Near San Diego, Calitoniia 



Between Santa Barbara and San 



Nicholas Island, California. 

 Near Santa Cms Island, Calilomia. . 



Monterey Bay, California . 



241-369 



191-98 

 181-215 

 215-240 

 216-339 



197-281 

 270-243 

 293-194 

 71-54 

 677-236 



Nature of bottom. 



yellow mud 



green mud 



gray sand, gravel, broken shells. 



fine gray sand 



yellow sand 



mud 



brown mud 



green mud 



do 



green mud, fine sand 



green mud 



gray sand, green mud 



green mud 



do 



shells, black pebbles, green sand 



black sand, pebbles 



green mud 



green mud, sand 



very hard sand 



hard 



U.S.Nat.Mus. 



AlbtttroM, 1904. 



The majority of these specimens are from 2909. The contents of more than one bottle are represented, however. Several 

 were broken together during the California earthquake of 1906, and the above label was In the remains of one bottle. 



Remarks. — This species resembles Ps. vcrrilli Ludwig * in several ways, but 

 differs in lacking the independent connecting plates on the papular areas of dorsal 

 skeleton, as well as in having true pectinate actinal intermediate and interadam- 

 bulacral pedicellariffi (when any pedicellarije are present), in having inferomarginal 

 spinules, and enlarged siiperomarginal granules on outer end of plate, a different 

 adambulacral armature and a fjroniinent unpaired tooth at inner angle of mouth 

 plates. Ludwig's Ps. pulcher'^ appears to bo closely related to pusiUus, hut the 

 papulsB are not so restricted in the latter, and the absence of marginal si)inules, par- 

 ticularly in the young, as well as the absence of an enlarged unpaired tooth are suffi- 

 cient to separate it. Other differences exist in details of structure. 



Ps. pusillus differs from Ps. parelii in having shorter, broader rays, bri;ader 

 paxillar area on rays, less coirf]iact paxillfe, less compact and more hemispherical 

 superoinarginal granules, much more prominent inferomarginal sjiinules, especially 

 in young, less densely granulated actinal intermediate plates, less numerous furrow 

 and actinal adambulacral spinelets. Tlic general facies of the two species is very 

 different. 



» Mem. Mus. Comp. Zo81., vol. 32, 1905, p. 116. (Gulf of Panama). 

 c Idem, p. 110. 



