272 DISCOVERY REPORTS 



The skeleton is like that of P. bellula and there are the same hyaline beads on the 

 surface of the primary plates. The two forms are so close that I think there is no 

 escaping Mortensen's conclusion that we are dealing with one variable species. 



Patiriella exigua (Lamarck) 



Asterias exigua Lamarck, 1816, in, p. 554. 



Asterina exigua Perrier, 1875, p. 302. — Clark, 1923, p. 285. 



Patiriella exigua Verrill, 1913, p. 484. — Fisher, 1919, p. 416, pi. 109, figs. 3, 4. 



Asterina (Patiriella) exigua, Mortensen, 1933, p. 252, pi. 12, figs. 4-8. 



Saldanha Bay, beach, 1926, 3 specimens. 



St. 271. Elephant Bay, Angola, 30 July 1927, shore, 3 specimens. 



Henricia ornata (Perrier) 



Echinaster ornatus Perrier, Ann. Sci. Nat., ser. 5, xn, 1869, p. 251. — Mortensen, 1933, p. 263. 

 Cribrella ornata Perrier, 1875, p. 112. — Sladen, 1889, p. 543. — Koehler, 1908, p. 629, pi. 12, figs. 105- 



106. 

 Henricia ornata Doderlein, 1910, p. 252, pi. 4, figs. 2, za. — Clark, 1923, p. 289. 



Saldanha Bay, Cape of Good Hope, beach, 2 specimens. 



Mortensen {loc. cit.) states: " It is perfectly evident that this species is not a Henricia 

 since it has no papulae on the oral side." But Echinaster reticiilatus H. L. Clark, listed 

 on the following page, has actinal papulae right up to the adambulacral plates (Clark, 

 1923, pi. 291). Echinaster in the restricted sense lacks actinal papulae. Othilia Gray, 

 usually merged with Echinaster, has actinal papulae. 



But ornatus resembles Henricia more than it does Echinaster. Its relationship to 

 typical Henricia is that of Echinaster, s.s., to Othilia. If one recognizes this distinction 

 between the two sorts oi Echi?iaster he is probably justified in doing the same for the two 

 categories of Henricia. 



One of the principal distinctions between Echinaster (plus Othilia) and Henricia 

 (including ornatus) is the structure of the adambulacral armature. In Echinaster there is 

 an unbroken web along the furrow margin uniting successive innermost subambulacral 

 spines (not the spinelets deep in furrow). Sometimes this web is thin and much 

 retracted, especially in dried specimens ; sometimes it is thick, almost leathery, as in E. 

 callosus. It is emarginate between the spines giving a serrate border to furrow. The 

 spines and membrane may be directed over the furrow, and interlock with the spines of 

 opposite side. 



Henricia entirely lacks this web. The marginal spine, or spines, of any adambulacral 

 plate are completely independent of those of adjacent plates. 



The gonads of Henricia open on the actinal surface — as do those of Othilia, at least. 



In the two dried specimens of H. ornata the gonopores are clearly visible — two in 

 each actinal interradial area. 



