Boone, Echinodermatd, Cruises of "Eagle" and "Am," 1921-28 147 



The tridactyl pedicellariae are very rare, scattered on the actinal 



surface. They are long, slender, bivalve, with a gap between the 



valves, long-stemmed. 



References : Scutella parma Lamarck, Anim. sans Vert., vol. Ill, p. 

 284, 1816. 



Echinarachnius parma Gray, Ann. Phil., vol. 26, p. 428, 1825. — A. 

 Agassiz, Mon. des Scutellidae : Fam. des Clypeastroides, p. 89, 

 pi. 20, figs. 9 to 18, 1841 ; Rev. Echini, part I, Mem. Mus. Comp. 

 Zool., Ill, p. 107, p. 179, 1872 (with extensive synonymy).— E.W. 

 McBride, Echinodermata, in Cambridge Natural History, vol. I, 

 p. 542, figs. 241, 242, 243, 244, with detailed discussion of the 

 anatomy, 1909.— H. L. Clark, Bull. U. S. Com. Fish., vol. XXII, 

 p. 564, pi. 10, figs. 58-62, 1902.— W. R. Coe, Conn. Geol. and Nat. 

 Hist. Surv., vol. IV, Bull. 19, p. 110, pis. 23, 24, fig. 2, pi. 27, 

 1912. — H. L. Clark, Cat. Recent Sea Urchins, Brit. Mus., p. 168, 

 1925. — A. H. Clark, Rept. Canadian Arctic Exped., 1913-18, vol. 

 VIII, part C, p. 4 c, 1920. 



Suborder: Spatangina. 

 Family: HEMIASTERIDAE. 



Genus : MOIRA A. Agassiz. 

 Moira atropus (Lamarck). 



Plate 94. 



Type: Lamarck states in his type description "Habite l'Ocean Eu- 

 ropeen, la Man Manche." His specimen was deposited in his cabinet; 

 later placed in the Paris Museum. 



Distribution: Recorded from South Carolina southward into the 

 Gulf of Mexico and West Indian region. Littoral to 80 fms. 



Material examined: Three large specimens, dredged in 3 fms., 

 Cape Cruz, Cuba, tag 410A, February 11, 1924, by the " Ara," Cat. 

 nos. 218, 219, 220. Five young specimens, Porto Padre, Cuba, March, 

 1928, Cat. no. 232. 



Color : Yellowish with brownish spines. 



Habits: Unrecorded. 



Technical description: Agassiz 's masterly description and illus- 

 trations of this common West Indian species are the principal refer- 

 ence for students. M. atropus is distinguished from the other West 

 Indian echinoids by its very deeply sunken ambulacra which gives it 



