CATALOGUE OF ECHINIDA. 
55 
Echinus spatangus, var. unicolor, Gmelin , S. N. 3200. 
Brissus unicolor, Van Phelsum , 39: Gray , Ann. Phil . 1825; 
Agassiz, Prod. 189. 
Seba’s figure, to which these synonyma have been appended, 
differs, in the form of the peripetalous fasciole, from any spe- 
cimen I have seen : it has more resemblance to the genus 
Desoria than Brissus; but it does not represent D. australis. 
** Anterior 'part of fasciole double. 
8. Brissus bicinctus. 
The fasciole double on the anterior ambulacral area, single 
on the hinder edge of the area of the lateral ambulacra. 
Brissus bicinctus, Valenc. in Agassiz <Ss Desor, 1. c. 13. 
Hab. Red Sea, Botta. Mus. Paris. * Perhaps a monstrosity, 
or is it a Faorina? 
9. Brissiopsis. 
Shell elongate, subcylindrical ; apex submedial; tubercles 
crenulated : ambulacra short, broad, converging nearly to the 
summit of the shell : the apical part of the odd anterior ambu- 
lacra with large pores, nearly surrounded by the flexuous 
peripetalous fasciole ; subanal fasciole niched, and distant from 
the vent : mouth surrounded with very large ambulacral pores ; 
vent far apart from the subanal shield; ovarial pores three 
or four : ocellar pores in a pentagon round the ovarial ones ; 
hinder ovarial larger. 
Brissiopsis, Agassiz ; Agassiz & Desor, Ann. Sc. Nat. viii. 14 ; 
Broun, Gescli. d' Nat. 201 ; Gray, Cat. Brit. Bad. B. M. 
Brissus, sp., E. Forbes, Brit. Star f. 187. 
Tripylus, sp., Philippi, Erich. Arch. 1846. 
1. Brissiopsis lyrifera. 
Swollen ; peripetalous fasciole scarcely sinuous, transversed 
by the two hinder ambulacra ; lower surface with very large 
hinder ambulacra separated by the narrow shield. 
Brissus lyrifer, Forbes, Brit. Starf. 187, fig. 187 ; Duben dc 
Koren, Zool. Bidrag. 280, 1. 10, fig. 46. 
Brissiopsis lyrifera, Agassiz <k Desor, Ann. Sc. Nat. viii. 1847, 
15 ; vi. 1. 16, f. 12 ; Gray, Cat. Brit. Rad. B. M. 
Hab. North Sea. 
a. Adult. Rothsay Bay, Isle'of Man. Presented by Ed- 
ward Forbes, Esq. 
b. In spirits. Shetland. Presented by A. G. Melville, M.D. 
