594 BRISSOPSIS LYRIFEltA. 



of the tubercles on the plates is the same as in B. lyrifera ; we have in this 

 specie- a cluster of large tubercles, carrying long spines between the peri- 

 petalous fasciole and the outer edge of the lateral petals and the sides of the 

 odd ambulacrum, which gives the apical part of the test a very different 

 aspect from that of 13. lyrifera ; the continuation of the sunken ambulacial 

 groove beyond the peripetalous fasciole to the ambitus, and beyond on the 

 actinal side, is quite well defined, forming a slight indentation at the edge 

 of the test, especially deep in the anterior lateral ambulacra, which form 

 a well-defined, broad, bare, and shallow groove as far as the ambitus, and 

 extending from the peripetalous fasciole to the actinostome. 

 The color of the spines was silver-gray in dried specimens. 



Luzon ; Siaui ; New Caledonia. 



Brissopsis lyrifera 



! /.'iK»i lyrifer Forbes, 1841, Brit. Starf., p. 187. 

 \ Brissopsis lyrifera A.GASS. Deb., 1847, ('. K. Ann. Sc. Nat, VIII. p. 15. 

 (Sec Part II. p. 354.) 



PL XIX. /. t-g; PL XXI. f. is; PI XXXi'IH.f. 36-38. 

 Norway ; Mediterranean ; Florida. 



AGASSIZIA. 



Agassizia Val., 1846, Voyage Vcnns. 

 (S,c Part II. p. 353.) 



Agassizia excentrica 



! Agassizia excentrica A. A<; , 18G9, Bull. M. C. Z., I. p. 276. 

 (See Part II. 353.) 



PL XP.f. 23, 24; PL XIV. f. 9-12. 

 Florida Gulf Stream. 



Agassizia scrobiculata 



! Agassizia scrobiculata Val., 1846, Voyage Venus Atlas. PI. I.f. 2. 



PL XIX".f. 1-3; PL XIX". f. 1-3. 



Owing to the inaccurate drawings of this species given by Valenciennes, 

 it has been described again under different names by Gray and Liitken ; a 



