Verrill, JVotes on Radi<(t((. 369 



one \\\)0\\ a plate ; by the fewness of the smaller dorsal sjiiiies, which 

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

 scattered on each sides, which sometimes form lateral I'ows, and on the 

 disk surround a i)entagonal area, enclosing a few small sj)ines. The 

 sjiines are surrounded at base by dense wreaths of small rounded pedi- 

 cellaria\ No major pedicellarite weri' found on any })art. 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 : bh 



Radius of disk of largest specimen, 'SS ; of rays 2 inches. 



The s]>ecinK'u from Bermuda has somewhat longer and sharper 

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

 rays form thi-ee regular rows. The disk is also covered uniformly 

 with similar spines. 



This species is allied to A. tenuhplna^ but appears quite distinct 

 from the Mediterranean specimens that I have examined. It has 

 siiorter and more angulated rays when mature, and less nuniei'ous 

 and shorter spines upon the back. Its pedicellariae are somewhat 

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

 ispina, I have been unable to find upon this, although they might 

 occur on other specimens. 



Order, ECHINOIDEA. 



LytechinUS variegatUS A. Ag-assiz, Bulletin Mus. Comp. Zool, p. 24, 1864. 



Psammechinus variegatus Agassiz and Desor, Catal. Rais. 

 Fsilechiaiis variegatus Llitkeu, Vidensk. Meddelelser, 1S<j5. 



This species is common at Bahia, wliere Mi-. Hartt obtained numer- 

 ous specimens. These examples agree very well Avith 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 Porto SesMiro. — 

 c. F. u. 



Echinometra Michelini Desor, Catal. Rais. 



Echinus lucuntur [imrs) Linn. ; Lamarck, etc. 



Echmomdni lucuntur Liitken. 



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



The large specimens of this species, brought from the Al)rolli(»s by 

 Mr. Hartt, do not appreciably differ from those of Bermuda, Florida 

 Reefs, and West Indies. 



