Verrill, N'otes on Eadiata. 369 



one upon a plate ; by the fewness of the smaller dorsal spines, which 

 form an irregular, often double median row along the rays, with a lew 

 scattered on each sides, which sometimes form lateral rows, and on the 

 disk surround a pentagonal area, enclosing a few small spines. The 

 spines are surrounded at base by dense wreaths of small rounded j^edi- 

 cellarije. No major pedicellariae were found on any part. The specimen 

 with five arms has but one madreporic plate. The others two or three. 

 The rays are rather long and slender, somewhat angulated when dry. 



Radii as 1 : 5\. 



Radius of disk of largest S])ecimen, -35 ; of rays 2 inches. 



The S))ecinien from Bermuda has somewhat longer and sharper 

 spines than the others of similar size, and those upon the back of the 

 rays form three regular rows. The disk is also covered uniforndy 

 Avith similar spines. 



This species is allied to A. tenmspina^ but a2)pears quite distinct 

 from the Mediterranean specimens that I have examined. It has 

 shorter and more angulated rays when mature, and less numerous 

 and shorter spines upon the back. Its pedicellarite are somewhat 

 diifercnt in form, and the large scattered ones, common on A. tenu- 

 ispiiKi^ I have been unable to find ujjon this, although they might 

 occur on other specimens. 



Order, ECHINOIDEA. 



LytechinUS VariegatUS A. Ag-assiz, Bulletin Mus. Corap. Zool., p. 24, 1864. 



Fsammechinus variegatns Agassiz and Desor, Catal. Rais. 

 Fsilechlnus variegatus Lutken, Vidensk. Meddelelser, 1865. 



This species is common at Bahia, where Mr. Hartt obtained numer- 

 ous specimens. These examples agree very well with the common 

 Florida and West Indian form, but are a little more depressed than 

 usual, and have more numerous tubercles on the interambulacral 



zones. 



Quite common in the vicinity of Cape Frio ; also at Victoria and Porlo Seguro. — 



C. F. II. 



Echinometra Michelini Desor, Catal. Rais. 



Echinus lucuntur (^r/vs) Linn. ; Lamarck, etc. 



Echinomdra lucuntur Liitkeu. 



Echinometra Michelini A. Ag , op. cit., p. 21. 



The large specimens of this species, brought from the .Vbrolhos by 

 ]Mr. Hartt, do not appreciably diifer from those of Bei-muda, Florida 

 Reefs, and West Indies. 



