OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 203 



The plates of the ventral surface continue those of the periphery 

 of the disk on the dorsal surface, but they are smaller, rounded, thin 

 and imbricated. The genital slits are broad. 



The mouth shields, which are of medium size, are triangular, a 

 little broader than long, with a rather sharp proximal angle bounded 

 by two almost straight sides ; the lateral angles are all rounded, and 

 the distal border is almost straight, or slightly convex. The adoral 

 plates are rather large, two and a half times as long as broad, with 

 the longer borders almost parallel; but they taper somewhat in- 

 wardly, and they are broadly in contact in the median interradial 

 line; they are somewhat enlarged outwardly, but do not separate 

 the mouth shield from the first side arm plate. The oral plates 

 are rather large, triangular, as high as broad. The inner mouth 

 papilla is small and conical; the outer papilla is large, elongated, 

 inserted on the whole free border of the oral plate; it is broader 

 than long, with the proximal angle slightly produced and sharp. 

 The mouth tentacle pore is furnished with a single small rounded 

 scale. 



The upper arm plates are large, very much broader than long, 

 almost semi-circular, with a very obtuse and very rounded proximal 

 angle bordered by two convex sides which pass over by rounded 

 angles to the convex distal border. The two or three first plates are 

 almost in contact, and the following are separated by a narrow 

 interval. 



The first under arm plate shows a principal portion which is quad- 

 rangular, a little broader than long, from which is given off a small 

 narrow lobe delimiting the radial border of the mouth tentacle pore. 

 The following are rather large, pentagonal, a little longer than 

 broad, with a sharp proximal angle and straight sides. They are 

 separated beyond the fifth by a narrow interval. 



The slightly projecting side arm plates carry three narrow, coni- 

 cal, subequal arm spines of which the length equals almost that of 

 the segment. 



The arm tentacle pores bear two very small, subequal, oval scales 

 set at right angles to each other. 



The color of the specimen in alcohol is white. 



Affinities and distinctive features. — In spite of its small size this 

 species shows very pronounced characters which do not permit of 

 referring it to any of the known species of the genus Amphilepis, 

 from which it differs by the presence of a single tentacle scale on 

 the mouth pore, while the arm pores possess two. Amphilepis re- 

 mittens differs markedly from A. protecta Kcehler in the size of the 

 plates of the dorsal surface of the disk, in having the mouth shields 

 a little broader than long, in having the under arm plates a little 

 longer than broad, and in the very short and relatively thick arms. 



