WEST INDIAN STARFISHES 73 



inner edge, just over the papular pore, or between them, when 

 there are two pores. 



The median radial row of plates is less compressed proximally 

 than in the type, and less depressed, being nearly on the same 

 level as those adjacent, but the plates have the same form, and 

 distally near the ends of the rays they become flat, polygonal, and 

 have no pores between them, as in the type ; most of them bear 

 a single median sharp spinule on the inner edge. There are 

 three radial rows of plates on each side of a ray, the outer one 

 of about three plates. Papulae form two rows on each side of a 

 ray, wdth a few in a third row. The five primary radial and 

 five interradial plates are larger, thicker and more distinct than 

 the rest, but are not turned up, as in the type, and they bear 

 very few minute spinules. They surround a central area of 

 small plates covered with dermis and bearing isolated spinules. 

 A minute dorsal pore is present, surrounded by microscopic 

 spinules; marginal plates are essentially as in the type, but all 

 parts are much smaller, and the upper ones mostly bear but one 

 minute spinule. The comb of marginal spinules and the in- 

 feromarginal plates are largely webbed and the spines are very 

 slender. 



Interactinal plates form two chevrons with a few of a third, 

 most of them have two small webbed spines on the aboral end. 



Adambulacral spines are like those of the type, but much 

 smaller. 



Other specimens are intermediate in size between the above 

 and the type, and have intermediate conditions, as to plates and 

 spinules, but all agree so closely that their identification is easy. 



PoRANiELLA ECHiNULATA (Pcrrier) VcrriU, 1914c. 



Marginaster echinulatus Perrier, Bull. Mus. Comp. ZooL, ix p. 17, 1881; 

 Etoiles de Mer, p. 230, pi. i, figs. 6, 7; Exped. Trav. et Talism., p. 169, 

 1894, (redescribed). Sladen, Yoy. ChalL, xxx, 366, 1889. 



Poraniella echinulata Verrill, Annals and Mag. Nat. History, vol. xiv, p. 20, 

 July, 1914c. 



Radii of the type are 3™°^ and 5°^ ; ratio 1 :1.66. The form is 

 somewhat stellate. According to Perrier (1894) the type has 

 the following characters: 



On the dorsal side the central plate is surrounded by ten plates, 

 five larger basals (interradials), and five radials, the last two 



