Clark — Six New Starfishes from the Gulf of California. 59 



Pedicellariee are only exceptionally present on the smaller abactinal 

 plates. 



Superomarginals and inferomarginals large and prominent, of equal 

 size, rounded oblong, slightly longer than broad, in the distal quarter of 

 the arm becoming squarish and at the tip slightly broader than long. 

 The two series correspond except at the upturned arm tip. As far as the 

 distal third or fourth of the arm each superomarginal, and several of the 

 inferomarginals, bears a delicate pedicellaria with two long and very 

 slender jaws ending in a palmate tip which lies in a slit-like groove on 

 the surface of the plate. 



Intermarginal papulae occur in the proximal half or two-thirds of the 

 arms. 



Between the inferomarginals and the adambulacrals there are several 

 rows of actinal intermediate plates ; the first of these, adjoining the 

 adambulacrals, is composed of plates which at first are not much inferior 

 to the latter in size, though in the outer half of the arm their size slowly 

 diminishes; this row extends to the fifth or sixth inferomarginal from 

 the end of the ray; most of the plates in the middle half of the row bear 

 pedicellarise like those of the marginals; above this is a second row of 

 slightly smaller plates which extends to the seventh inferomarginal; a 

 third row of still smaller plates reaches to the fourth inferomarginal, 

 while above this last are two additional rows, one of which reaches the 

 third, the other the second, inferomarginal ; except in the first row none 

 of these plates bear pedicellarise. 



The adambulacral plates are oblong, at first about twice as broad as 

 long, decreasing slightly in length distally, and increasing again termi- 

 nally ; the plates in this series are separated from each other by prominent 

 grooves. The furrow spines are four, becoming three in' the distal half 

 of the arm ; they are triangular in cross section, the sharpest apex of the 

 triangle being directed toward the center of the furrow border of the plate 

 which bears them ; the most proximal is the stoutest, and the two median 

 are the most slender. 



Beyond the furrow series there are three rows each composed of three 

 short truncated spines which are triangular or polygonal in section; the 

 innermost row, bordering the furrow spines, is somewhat curved, and is 

 placed somewhat obliquely so that the distal end is nearer the furrow 

 than the proximal ; the spines of the outermost row are scarcely dis- 

 tinguishable from the granular investment of the body surface. 



The mouth plates are triangular; each bears from seven to nine stout 

 prismatic spines on the ambulacral border; on the common actinal 

 surface of each pair there are from eight to ten stout prismatic spines 

 which decrease in size outwardly. 



The whole body is covered with closely packed fine hemispherical or 

 polygonal granules which entirely conceal the outlines of the underlying 

 plates; the only breaks in this granular covering are the papular pores 

 and the narrow elongate grooves in which lie the pedicellariae. 



The color in alcohol is light yellowish, or dark brown. 



Type.— CRt. No. :3S,317, U. S. N. :^.I., from "Albatross" Station 2829, 

 off Lower California, in 31 fathoms. 



