NO. 29 A NEW GENUS OF STARFISHES CLARK 5 



The mouth plates are large and broad, the pairs of mouth plates 

 being somewhat broader than long with the outline of the inner half 

 semicircular. Each mouth plate bears six well spaced spines about 

 its border, of which the innermost is somewhat larger than the others, 

 and the outermost is the smallest. One of the mouth plates of each 

 pair bears an additional spine near its center. 



Description of the type specimen (fro^m Perrier) . — A small species 

 with 5 short blunt arms flattened below, rather strongly convex 

 above; R=io mm, r=:4 mm; R=:2.5 r. 



Each adambulacral plate bears on the border of the ambulacral 

 groove three rather short divergent spines ; outside of these on the 

 ventral surface there is a transverse row of three spines, equally 

 divergent, so arranged that a narrow naked band separates them 

 from the border of the arms, which is definitely marked and fringed 

 with the groups of blunt spinules borne by the abactinal plates ; the 

 dorsal ossicles each bear a group of a dozen rather short spinelets, 

 obtuse at the end or even slightly capitate, divergent, longer along 

 the margin of the arms, disposed irregularly on the surface of the 

 plates, though in such a way as to cover their whole surface. 



Isolated tentacular pores occur between the plates ; there are 1 1 

 more or less irregular rows from one side of the arm to the other. 



The madreporic plate is rounded, convex, rather small, half con- 

 cealed among the spinelets of the dorsal surface, situated half way 

 between the actinal surface and the summit of the interbrachial 

 angle. 



Azotes on the type specimen. — Perrier's type specimen is much 

 larger than the specimen collected by the Caroline; R=i2 mm, 

 r = S mm; R=2.4 r. Most of the spinelets on the abactinal surface 

 are in place, so that the plates are more or less concealed. 



The plates on the abactinal surface are more numerous than is 

 the case in the Caroline specimen, and the rows are not quite so 

 regular. The rows bordering the abactinal surface consist of 14 or 15 

 plates instead of 9, and these plates are not sensibly different from 

 those of the outer rows, which are proportionately more numerous. 



The abactinal plates bear 7-15 (usually 8-10) short, stout, club- 

 shaped and echinulate spinules. 



Beyond the area delimited by the five interradial plates are rows 

 of papulae that run to the outer third of the arm. The papulae are 

 situated in the depressions between the plates. They are usually 

 solitary, but in a few cases two were noticed in a single depression. 

 There are eight rows of papulae of which the lowest consist of four 

 or five, and those on the abactinal surface of about a dozen. 



