STARFISHES OF THE PHILIPPINE SEAS. 203 



ciculate pedicellariae of diomedeae^ and has a much smaller madre- 

 poric body. 



The principal differences between gazeUae and diomedeae are as 

 follows : gazellae has much more extensive papular areas, with more 

 numerous pores, even in small specimens. Large specimens have 

 about 80 pores and small examples 35 or 40 or even more, according 

 to size. In diomedeae there are but 25, or half as many as a similar 

 sized specimen of gazellae would have. In gazellae there are fewer 

 marginal mouth si:)ines and furrow spines, which are stouter, and the 

 first adambulacral has 2 well-developed subambulacral spines. The 

 abactinal, enlarged spines of the ray of diomedeae are more con- 

 spicuous and more numerous than usually the case in gazellae^ 

 although this character is variable and difficult to apply. 



CHEIRASTER LUDWIGI Fisher. 



Plate 48, fig. 1 ; plate 49, fig. 2 ; plate 55, figs. 2, la. 

 Cheirastcr ludioigi Fisheb, 1913c, p. 205. 



Diagnosis. — Differing from Ch. gazellae Studer (as herein under- 

 stood) in having only about 10 papular pores, and consequently very 

 small papularia, which do not extend beyond the first superomar- 

 ginal upon the rays; in having short, robust inferomarginal spines, 

 subsquamiform or squamiform central inferomarginal spinelets, no 

 sign of distal abactinal enlarged spinules, and normally no infero- 

 marginal fasciculate pedicellariae ; in having 17 instead of 15 to 15.5 

 adambulacrals to first 10 inferomarginals, and 2 suboral spines in- 

 stead of 1. Rays 5. R=53 mm., r=9.5 mm., R=5.5 r; breadth of 

 ray at second superomarginal, 9 mm. Superomarginal spine stout, 

 near middle of plate; 1 stout inferomarginal spine and 1 conical 

 accessory spinule below it; adambulacral plates very prominent, 

 meeting in middle of furrow ; furrow spines 7 or 8 ; 1 subambulacral 

 spine (2 on first plate and on distal plates) ; oral spines 7 ; suboral 

 spines 2. 



Description. — Abactinal plates only slightly elevated, the groups 

 of small, subequal, bluntly pointed or obtuse spinelets distinctly 

 spaced, sometimes more than the diameter of the gi'oup. No enlarged 

 central spine anywhere on the abactinal surface. The larger paxillae 

 of disk have 10 to 12 upright or slightly divergent spinelets; the 

 smaller (in the minority) have 5 to 7, or upward of 10. On the ray 

 5 to 7 slightly slenderer spinelets surround a single central one, or 

 3 to 5 form a simple group. One or 2 inconspicuous pectinate pedi- 

 cellariae are present near the anal aperture. Papularia small, 2 

 parted with about 10 pores, the distalmost being even with a line 

 across the ray between the interradial marginal sutures of either 

 interbrachium. The superomarginals, 25 in number, are longer than 

 broad beyond the fifth, and encroach narrowly upon the abactinal 



