STARFISHES OF THE PHILIPPINE SEAS. 437 



plates. The longest spines next to furrow are equal to 1.5 adam- 

 bulacral plates in length, and are shorter than in arcystata. The 

 spines are webbed together by their bases, as also are those of the 

 abactinal and marginal plates (but less conspicuously). In this 

 form the adambulacral spines are very much more numerous than in 

 arcystata, while the spines along the furrow margin are slightly 

 shorter. 



Madreporic body situated at about the middle of r, variable in 

 size, usually rather small, with few ridges which are closely covered 

 with spinelets. 



Type-locality. — Straits of Korea (Sladen). 



Distribution. — Straits of Korea ; central part of Philippine Archi- 

 pelago, 169 to 423 fathoms. 



SjJecimens examined. — Eleven, from the following stations : 



5510, Iligan Bay, north coast of Mindanao, 423 fathoms, gray mud, 

 fine sand, bottom temperature 53° F. ; 1 specimen, 



5517, 10.5 miles northeast Point Tagolo Light, Mindanao, 169 

 fathoms, bottom temperature 54.3° F. ; 1 specimen. 



5519, near 5517, 182 fathoms, globigerina, sand, bottom temper- 

 ature 54.3° F.; 5 specimens. 



5523, 6.7 miles northeast Point Tagolo, depth and bottom unre- 

 corded; 2 specimens. 



5524, 17 miles northeast Point Tagolo, 360 fathoms, sand, bottom 

 temperature 52.8° F. ; 1 specimen. 



6536, between Negros and Siquijor, 279 fathoms, green mud, bot- 

 tom temperature 53.5° F. ; 1 specimen. 



Remarks. — From station 5523 is a small specimen having E, 23 

 mm., and r, 5 mm., hence almost exactly the size of the type of 

 den^ispina, which, of course, is a young specimen. As a conse- 

 quence the abactinal skeleton is much less open than in the specimens 

 described above, and the spinelets are fewer. On the furrow face 

 of the proximal adambulacrals are two spinelets. 



HENRICIA MICROPLAX Fisher, 



Plate 120, figs. 3, 5 ; plate 121, fig. 2 ; plate 132, fig. 3. 



Henricia 'microplax Fishek, 1917&, p. 91. 

 Diagnosis. — Rays 5. R=45 mm., r=7 mm,, R=6.4 r; breadth of 

 ray at base, 8 mm, Rays slender, depressed, slightly swollen at 

 base; disk small with an interradial sulcus near margin. General 

 appearance of abactinal surface similar to that of E. sanguinolenta; 

 superomarginal plates forming an inconspicuous series; inferomar- 

 ginals in a regular conspicuous series; several series of actinal in- 

 termediate plates at base of ray; adambulacral spines about 15, be- 

 sides 3 or 4 on the furrow face of plate. 

 13434— Bull. 100—19 29 



