WEST INDIAN STARFISHES 47 



Pen'ier recorded it from five Blake Exped. stations, in 127 to 

 734 fathoms, among the Lesser Antilles. 



The specimen from off southern Georgia (No. 18,392) has the 

 proximal interactinal plates transversely oblong or rectangular, 

 and similar to the marginals in size and form. 



The adambulacral spines are strongly differentiated ; the three 

 nearest the groove show a decided approach to the formation of 

 a true marginal comb. Those next to these are about twice as 

 long as those farther back. There is a small furrow-spine deep 

 in the groove, and distally there may be two. 



Small isolated papular pores form a row between the inter- 

 actinals and marginals, and also between the former plates; a 

 few are located proximally between the interactinals and mar- 

 ginals. 



Henricia sexradiata (Perrier) Ver. 



Cribrella sexradiata Perrier, Bull. Mus. Comp. Zool., vol. ix, p. 8, 1881; 



Etoiles de Mer, p. 209, pi. iv, fig. 6, 1884. 

 Henricia sexradiata Verrill, N. Pacific Starfishes, p. 371, 1914«. 



Plate xi; figure 7. Details. 



Rays slender, variable in number, often unequal in size ; most 

 frequently there are six of which about three are shorter than 

 the others, due to autotomy. 



The type described by Perrier had the radii 6""^ and 13™™; 

 ratio, 1 :2.16 ; others have relatively longer rays. 



The dorsal surface is covered with numerous small reticulated 

 ossicles, carrying very small spinules; the papular areas are 

 smaller than the ossicles and mostly have a single papula. Two 

 madreporic plates are usually present, small, granulated, one each 

 side of a single ray. 



The two rows of marginal plates are very distinct ; the plates 

 are quadrangular and covered with nearly uniform minute spin- 

 ules, a little larger than those on the dorsals. There is a short 

 row of peractinal plates of similar size and form, proximally. 



The adambulacral plates are transversely oblong; they bear, 

 near the inner margin, about five small obtuse spinules, larger 

 than the others, and forming two longitudinal rows ; two belong 

 to the inner or marginal row; three to the outer one. The rest 



