Zoological Society. 445 



graph of Echini and other papers on these animals, all the species of 

 these two families then known to them, and as they had every facility 

 for examining the British Museum specimens, the species now to he 

 described are but few in number. 



Fam. 1. SCUTELLIDJE. 



Genus Echinanthus. 



Among the species which have the base concave, of which E. ro- 

 saceus may be considered the type, are to be added — 



1 . Echinanthus Australasi^e. 



Vent beneath, at a little distance from the edge ; back very convex 

 in the middle ; upper margin rather flattened, with a slight concavity 

 at the end of the ambulacra ; under side flat near the margin, deeply 

 concave in the middle ; spines of the under side near mouth very fine. 



Hab. Australia; N.S.W., Brisbane Water. 



2. Echinanthus testudinarius. 



Vent beneath a little within the edge, depressed ; back slightly 

 raised, evenly convex ; under surface rather concave from the edge. 

 Hab. Indian Ocean ; Borneo. 



3. Echinanthus oblongus. 



Ovate-oblong, elongate, rounded at the end ; sides thick, rounded; 

 back depressed round the end of the ambulacra ; crown rather convex; 

 ambulacra ovate, lanceolate, broad, and closed at the end ; under 

 side concave nearly to the edge ; ambulacral grooves indistinct ; vent 

 near the margin. 



Hab. Philippines ; Siquijor. 



4. Echinanthus productus. 



Shell ovate, elongate, the hinder end produced and flattened, the 

 edge rather thick, thinner behind ; the ambulacral petal broad, the 

 Ijands not quite united at the end ; under side concave to the margin ; 

 vent near the margin. 



Hab. ? 



5. Echinanthus Cole^. 



Shell ovate, subpentagonal, depressed ; margin thick, rounded; back 

 depressed as far as the end of the ambulacra, and then rather convex 

 in the middle, the under side concave nearly to the edge ; ambulacral 

 petal ovate lanceolate, closed at the end ; vent near the margin. 



Hab. Mauritius. Lady Mary Cole. 



To those which have a flat base may be added — 



6. Echinanthus explanatus. 



Depressed, much expanded, centre of the back rather convex ; 

 ambulacra occupying rather more than half the space between the 

 vertex and margin, the lines of pores of the anterior pair and posterior 

 odd one far apart at the en 1 ; cavity with thin concentric lines of 

 short compressed columns near the margin ; jaws depressed. 



Hab. Mauritius? 



