STARFISHES OF THE PHILIPPINE SEAS. 16S 



Type-locality. — Station 5332, Mindoro Strait, west of Mindoro, 

 Philippine Islands, 745 fathoms, green mnd, bottom temperature 

 38.2° F. 



Distribution. — Known only from the type-locality. 



Specimens examined. — Seven, from the type-locality. 



Remarks. — This form resembles so closely evaulus that it has been 

 described as a geographical race, although no specimens from inter- 

 mediate localities have been examined. The differences are mainly 

 as follow^s: evaulus has fewer and higher pedicellariae with less 

 modified jaws, and they are not found on the adambulacral plates; 

 the raj's are a little shorter and the disk relatively a little larger; 

 the actinal intermediate plates extend farther along the ray; the 

 furrow spines and marginal mouth spines are terete, not markedl}'- 

 compressed; the subambulacral spines are in 2 series, but this is 

 sometimes the case in the foregoing species. 



Family LUIDIIDAE Verrill. 



Genus LUIDIA Forbes. 



Luidia Forbes. Mem. Wernerian Nat. Hist. Soc, vol. 8, 1839, p. 123. Type, 

 L. fragilissima i=L. ciliaris (Philippi)). 



KEY TO THE SPECIES OP LUIDIA HEREIN DESCRIBED. 



o\ Raj^s 5, and paxillae never with a conspicuous central spine. 



6\ Inferomargiuals with a single conspicuous lateral spine and several short, 

 appressed actinal spinules. 

 c*. Adambulacral armature : a furrow spine, a large subambulacral spine, 

 and adorad to this, a long, slender, two-jawed pedicellaria. 



longispina, p. 164. 

 c^. Adambulacral armature : a furrow spine and, proximally, 5 subambu- 

 lacral spines ; distally, 3 ; no adambulacral pedicellariae. 



prionota, p. 164. 



h'. Two or 3 conspicuous spines (sometimes 4 or 5) in a transverse series 



on inferomarginal plate; similar in general appearance to L. sarsi 



orientalis, p. 16(5. 

 a\ Rays 7 to 11. 



&\ Paxilhie without a conspicuous central spine, or if this is present then 

 only on outer part of ray. 

 c\ Rays usually 8 ; paxillae of lateral rows quadrate or roundish quadrate, 

 compact, without a conspicuous pedicellaria ; no large naked spaces be- 

 tween the inferomarginal plates ; never any pedicellariae in furrow 



maculata, p. 168. 



<f. Rays constantly 11 ; paxillae spaced, delicate, with a conspicuous central 



pedicellaria and also several on the sides of the pedicels; inferomar- 



ginals separated actinally by large, naked spaces; a few proximal 



adambulacral plates with a slender pedicellaria just dorsal to furrow 



spine gymnochora, p. 175. 



6'. Some of the paxillae of lateral parts of ray, at least, with conspicuous 

 central spine, 

 c*. No pedicellaria just dorsal to furrow spine. 



d\ Rays 7 (sometimes as few as 5) ; inferomarginal spines usually 3, in 

 a transverse series mvUjnyi, p. 170. 



