STARFISHES OF THE PHILIPPINE SEAS. 527 



1 to each adambulacral plate. The membrane between the ridges is 

 thin and without integumentary prickles. The costae are com- 

 pressed, higher than thick, and along the summit is a row of com- 

 paratively coarse, conical spinelets (one-third to one-half total height 

 of the ridge), spaced in twos and threes. First lateral spine, usually 

 at second complete costal ridge, acicular, sharp, equal in length to 

 1| or 2 adambulacral plates. On the outer third of the costal area 

 the spines are equal in length to 5 consecutive adambulacral plates 

 ( 12 mm. ) and increases to 6 at the beginning of the distal third. 



Adambulacral plates of costal region about as long as wide. The 

 armature consists of a true furrow spine at either end of the plate 

 and equal to about two-thirds length of plate; aboracl and actinad 

 to the adoral spine is a slightly shorter one, generally pointed away 

 from the furrow; the large actinal spine, equail to 2 to 3 plates in 

 length, is situated on the aboral half of the plate. The formula is 



-^^y, but on the outer half of ray is ---j-I, the small adoral second 



spinelet disappearing, while the large actinal spine moves to the 

 middle of the plate. The distal plates are also longer than wide, 

 as is generally the case. On some of the proximal plates the formula 



{JL.J 



would stand . . . The spines are incased in a sheath armed with 



minute pedicellariae. 



Mouth plates small, with 1 spine at each end of the excavated 

 furrow margin, nearly as long as the plate. The inner of these two 

 is strongly bent at the base. Just mesad to it is a small actinostomial 

 spinelet, about half its length. The suboral spine, fluted and sharp. 

 is strongly bent at the base, so that with its fellow it is pointed 

 horizontally across the actinostome. The pedicellariae are grouped 

 along one side only of the spines, and the sheaths are thin. 



Madreporic body convex and prominent, 1.5 mm. in diameter. On 

 the adcentral border is a conspicuous, nearly naked area composed 

 of 7 plates. The articular surface of the ambulacrals, where a ray 

 has been broken off, is about as broad as high, and the scar of each 

 plate is ovoid in outline, the lower ends being bent away from each 

 other. Gonads, first adambulacral plates, first marginal plates as in 

 generic diagnosis. 



Type.— Cat. No. 37022, U.S.N.M. 



Type-locality. — Station 5626, between Gillolo and Kayoa Islands, 

 Molucca Islands, 265 fathoms, gray mud, fine sand; 1 specimen. 



Distribution. — Vicinity of Celebes and Molucca Islands, 265 to 

 559 fathoms. 



Specimens exarriined. — The type and 1 arm from station 5648, 

 Buton Strait, Celebes, 559 fathoms, green mud ; bottom temperature, 

 39.2° F. 



