9Q BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



The following table will show some of the variations due to size: 



Variations in Dipsacasler eximius. 



" Tlie fleiires denote how tar along ray, measured from interradlal angle or first plate, the intermediate plates extend. Thus 

 the second row of actinai intermediate plates In the first specimen extends 0.7S length of ray, the third row 0.65, the fourth 0.39. 

 b To second inferomarginal. 

 cOoes not extend beyond first Inferomarginal (four plates in all). 



Ymtng. — The smallest specimen from station 43.33 has R = 13 mm., and is easily 

 recognized as belonginp; to eximius, and as distinct from D. anoplus by reason of 

 the spiny inferomarginals extending conspicuously beyond superomarginals, by the 

 vddt} fasciolar grooves, character of adambulacral and actinai intermediate plates. 

 The abactmal paxilla? are high delicate and more spaced as well as relatively fewer 

 than in the adult. The papulte are generally distributed as in adult, but not gonads 

 have developed. Adambulacral furrow spinelets four, and only four to six very 

 delicate spinelets to each intermediate plate. The spinulation is open and lacks 

 the compact appearance of D. anoplus. (See pi. 16, fig. 3.) 



Type.— Cat. No. 22328, U.S.N.M. 



Type-locality. — Albatross station 4334, Los Coronados Islands, southwest of 

 San Diego, California, 52.5 to 514 fathoms, green mud. 



Distrihution. — From north of Monterey Bay (Pigeon Point) to the vicinity of 

 San Diego, California (Los Coronados Islands, Lower California) and from 206 to 

 525 fathoms, usually on green, black, or yellow mud. 



Specimens examined. — A total of twenty-two specimens from the folio-wing 

 Californian localities: 



Specimens of Dipsacasler eximius examined. 



6 Probably erroneous, or specimen inco.-rectly labeled. 



