Clark — Six New Starfishes from the Gulf of California . 57 



side is another parallel row of somewhat smaller tubercles which runs 

 from a point on the side of the interradial furrow half way between the 

 center of the disk and the margin of the superomarginals to the level of 

 the fourth or fifth superomarginal, where it disappears; these lateral rows 

 are about as far from the median rows as the latter are apart. Beyond 

 these long lateral rows on either side is a short lateral row arising on the 

 border of the interradial furrow about two-thirds of the distance from 

 the center of the disk to the superomarginals, and running to the level 

 of the distal border of the second superomarginal. 



Shallow, rather broad, furrows extend from the apical region of the 

 disk to near the superomarginals; these are more or less petaloid in 

 shape, and are 4 mm. in maximum diameter, half way between the 

 center of the disk and the superomarginals ; these furrows are bordered 

 with a more or less irregular and indistinct row of tubercles, and carry 

 within the groove three pairs of large low tubercles. 



Many of the abactinal plates carry pedicellarise which, however, seem 

 to be absent from the arms. 



The madreporic body is small, about 2.5 mm. in diameter, with rather 

 coarse strife. 



The superomarginals decrease regularly in width to the arm bases, 

 then remaining of practically the same width to near the ends of the 

 arms; they are slightly tumid, and their surface is covered with well 

 spaced, rather high, tubercular granules ; except for a few of the terminal, 

 each bears a pedicellaria. 



The inferomarginals correspond to the superomarginals, which they 

 resemble in all ways except in being slightly wider, and in not decreasing 

 perceptibly in width until near the tip of the arms; all of them bear 

 pedicellarise. 



The actinal intermediate plates are numerous, and are arranged in 

 rows between the marginals and the adambulacrals; they bear very 

 numerous well spaced globular tubercles ; toward the periphery of the 

 actinal surface these tubercles become smaller, and merge into the tuber- 

 cles covering the inferomarginals. Nearly all of the actinal intermediate 

 plates bear the characteristic pedicel larise; these are largest on the plates 

 bordering the adambulacrals, where they occur in a diagonal position, 

 their long axis coinciding with that of the series of plates of which the 

 plates bearing them are a part; further from the ambulacra) grooves the 

 pedicellaripe become smaller and more irregular in orientation, though 

 most of them have their long axis parallel to that of the series including 

 the plate which bears them. 



The adambulacral plates are apparently about as long as broad ; the 

 furrow border is slightly curved; they carry five or six (usually five) 

 furrow spines, graduated in height from the small and short outer to the 

 long and stout strongly flattened central, which increase in diameter and 

 end in a rounded tip. These plates, especially near the mouth, may 

 carry a small pedicellaria on the proximal (adoral) border. Within the 

 series of furrow spines there is a series of three stout spines, the central 

 much the largest, parallel to the furrow; beyond this, and spaced from 



