ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER 



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is decidedly phanerozoniate in appearance and has not become a Zoroaster. At this 

 particular immature stage it does not belong to any known genus. 



There are a number of half grown specimens with R 05 mm., which closely 

 resemble the adult but have only two series of actinolateral plates. 



Type.— C&t. No. 22347, U.S.N.M. 



Type-locality.— Station 4400, 32° 50' 20" N., 118° 03' 30" W. (between San 

 Diego and San Clemente Island), 500 to 507 fathoms, green mud; bottom temperature, 

 40.2 F. 



Distribution. — The typical form is found off southern California, from San 

 Diego to Santa Cruz Island, in 216 to 510 fathoms; including the following race, 

 mordax, the species ranges to Washington and to 603 fathoms off southern California 

 and 760 off Washington. 



Specimens examined. — Forty- two. 



Specimens of Zoroaster evermanni examined 



ZOROASTER EVERMANNI MORDAX Fisher 



Plate 13, Figure 4; Plate 14, Figure 2; Plate 19, Figure 2 

 Zoroaster evermanni mordax Fisher, Ann. and Mag. Nat. Hist., ser. 9, vol. 3, 1919, p. 391, 



Diagnosis. — Closely resembling Z. evermanni but differing in having more robust 

 primary spines (which are typically also a little shorter actinolaterally), and in having 

 on the second from inner spine of prominent adambulacral plates a large pedicellaria 

 (or sometimes two), from 1.5 to 2.5 mm. long, and conspicuously bigger than the 

 cluster of small pedicellariae on the furrow spine. R, 153 mm.; r, 10+ mm. R = 

 15 r. 



Description. — This race is so closely similar to the type race in most respects 

 that a description is superfluous. In a very large specimen from the type-locality 

 the skeleton is more open, the papular areas being larger. There are 20 or 21 adradial 

 plates and 15 superomarginal plates to 10 carinal plates. A very few adradials bear 

 a major spine proximally, but this can not be considered a reliable character. Rather, 

 I think, it is due to age. 



The prominent adambulacral plates have a transverse series of four or five 

 spines shorter than in typical evermanni. On the furrow spine is a prominent cluster 

 of four to eight small unequal pedicellariae (sometimes one or two enlarged); spine 

 two is short and carries on the side a large pedicellaria resembling a miniature ibis 

 head, the jaws being generally curved at the tip. The nonprominent plates carry a 



