Boone, Echinodermata, Cruises of "Ara" and "Alva" 161 



arm spines are each ringed with eight to ten bands of brown 

 alternating with cream, except the greatly enlarged dorsal occa- 

 sional spine, which is brown throughout the entire length. 



The present specimens of Ophiomastix lutkeni differ from 

 those previously described in possessing very numerous spines all 

 over the abactinal, circumferal and outer actinal surfaces and 

 also in the absence of large abactinal granules. Some large gran- 

 ules are present, but under magnification these prove to be only 

 the supporting basal tubercles of the long spines, from which the 

 related spines have become dislocated, each granule or tubercle 

 showing dorsally a median concavity into which the base of the 

 spine fitted, similar to the attachment of the primary spines of a 

 typical sea-urchin. 



References : Ophiomastix lutkeni, Pfeffer, G., Abhand. Senck- 

 enb. Naturf. Gesellsch, Frankfurt, 1900, Bd. XXV, p. 84. — 

 Clark, H. L., Mem. Mus. Comp. Zool., 1915, vol. XXV, p. 296, 

 pi. 16, figs. 3, 4. — Matsumoto, H., Journ. Coll. Sci. Imp. 

 Univ. Japan, 1917, p. 349, fig. 98. — Koehler, R., Bull. C, 

 U. S. Nat. Mus., vol. V, 1922, p. 330. 



Ophiarthrum Peters 

 Ophiurthrum pictum (Muller and Troschel) 



Plates 59 and 60 



Type : Muller and Troschel's type was brought from Java by 

 Kuhl and Van Hasselt and deposited in the Leyden Museum. It 

 remained for a long time a unique specimen. 



Distribution: This species has since been taken on islands 

 near New Guinea (Lyman); in the Philippine Islands; Pelew 

 Islands (Lyman, H. L. Clark) ; Torres Strait: Murray Islands, 

 Mer (H. L. Clark). 



Material examined: One specimen, taken at Ingham Island, 

 Queensland, Australia, October 12, 1931, by the "Alva." This 

 appears to be the most southern record of the species in Queens- 

 land. 



