ECHINODRRMATA — COLEMAN. 701 



marginal plates bear a small tubercle on the lower side. This is 

 the specimen figured. 



This species may be distinguished from A. tuherculo$us, Fisher^, 

 bj the form of the dorsal tubercles, which are broad at the distal 

 extremity and but slightly convex, while in Fisher's species they 

 are pointed. The spines of the adambulacral armature are in 

 series of 4, 1, and 1., as compared with 6, 2, and 1, in A. 

 hiberculosus. It also differs in several important features from 

 A. elegans, Gray'. The rays are much longer in proportion to the 

 size of the disc, and tne tubercles of under surface are not larger 

 and more crowded towards the mouth. The spines of the 

 adambulacral armature are in series of 4, 1, and 1., as compared 

 with 5, 2, and 1., in Gray's species. 



Localities. — Oflf Botany Bay, 79-80 fms. ; sand and stones 

 ("Thetis"). South Australia, 15 miles south of St. Francis Is., 

 30 fms. ; Off East Coast of Victoria (" Endeavor "). 



^Fisher— Bull. U.S. Fish. Comm., xxiii., pt. iii., 1903, p. 1075. 

 3Gray— Proc. Zool. Soc, xv., 1847, p. 75. 



