Boone, Echinodcnnata; Cruises of "Eagle" and "Ara," 1921-28 143 



The anus is small and is situated nearly half way the distance 

 between the tip of the petal and the outer margin. 

 References: Stolonoclypus ravenelii A. Agassiz, Bull. Mus. Comp. 



ZooL, vol. I, p. 265, 1863-67. 

 Clypeaster ravenelii A. Agassiz, Mem. Mus. Comp. ZooL, vol. X, p. 43, 



pi. XV b, figs. 1, 2, pi. XV c, figs. 1, 2, 1883.— Mortensen, Th., 



Echinoidea, Danish Ingolf Exped., vol. II, pp. 185, 186, 193, 1907. 

 Clypeaster ravenelii H. L. Clark, Cat. Recent Urchins, Brit. Mus., 



p. 151, 1925. 



Clypeaster rosaceus (Linne). 



Text figure 5. 



Type: Linne 's type locality is cited as the "oceans of Asia," in the 

 Tenth Edition. 



Distribution : West Indian region. Littoral to 15 fms. 



Material examined: Two beach worn tests from Dry Tortugas, 

 Florida, Cat. no. 295. Notes made from a complete specimen, collected 

 at Nassau, Bahamas, in the collections of the American Museum of 

 Natural History. 



Color: Dark reddish brown. 



Technical description: Test high, with outline not quite oval, 

 more blunt at one end and narrowed at the opposite end; abactinal 

 surface so arched that there is scarcely a margin ; the oral surface 

 deeply concave, mouth sunken, jaw-teeth strong, blunt. The ambu- 

 lacral rosette is large, with three of the petals a little longer than the 

 other two ; all five very broad, sharply defined by the poriferous area, 

 the interporiferous region more or less elevated. On the actinal sur- 

 face the ambulacral areas are marked by straight furrows, which are 

 widest for the inner two-thirds of their length and become vague, 

 sometimes scarcely distinguishable, on the outer third. The anus is 

 almost on the margin of the lower surface of the broad blunt end of 

 the test. The spines are very short, tapered at the tip, longitudinally 

 striated. Near the ambulacral furrows and round the peristome the 

 spines are a little longer and stronger than elsewhere. The secondary 

 spines are less than half so long as the primaries, similarly striated, 

 very slender and swollen distally. 



The large, tridentate pedicellariae are quite abundant on both the 

 actinal and abactinal surfaces, and have the shape shown in figure A. 



