16 
CATALOGUE OF ECHINFDA. 
Echinus planus, Humph, t. 14, f. 9. 
Scutella parma, part., Resmoul. Tab. Syn. 236. 
Hah. Amboyna. Rumph. 
a. Without spines. Indian Ocean. 
b. India ? Presented by Mr. Petit. 
5. Dendraster. 
Shell depressed ; subcircular, entire, depressed ; ambulacra! 
star excentric, posterior, petals oblong, rounded, unequal, the 
odd one longer than the anterior pair, the hinder pair very 
short ; the branches converging, and nearly closed at the end ; 
inferior ambulacral grooves much branched, and imprinted 
even on the dorsal surface of the shell ;■ anus inferior, just 
within the margin ; genital pores four, rather far apart. 
Dendraster, Agassiz & Resor, Ann. Sci. Nat. 1847, 135. 
1. Dendraster excentricus. 
Scutella excentrica, Eschscholtz , Zool. Atlas , 19, t. 20, f. 2, 1829. 
Echinarachnius excentricus, Valen. Voy. Venus , Zool. 1 . 10. 
Dendraster excentricus, Agassiz & Resor, 1. c. 135. 
Hab. Kamtschatcka, Unalasch, Esch. ; California, Neboux. 
a, b, c. Bleached. California. Presented by Lady Katherine 
Douglas. 
d, e,f, g. Purple, some with spines. California. Presented 
by Lady Katherine Douglas. 
6. Rotula. 
Shell circular, strongly pierced, and digitated on the edge ; 
ambulacral petals large, even at the end ; inferior ambulacral 
groove ramified, but not waved ; anus inferior, nearer the 
mouth than the hinder edge ; ovarial pores four, contiguous to 
the madreporiform plate. 
Scutella, § 1. Resmoul. Tab. Syn. 220. 
Rotula, Rumphius, Klein ; Ravilla , Cat. 425 ,* Agassiz, Monog . 
Echin. ii. 23 ; Agassiz Ac Resor, 1. c. 138. 
Placenta, sp., Klein. 
Echinodiscus, sp., Breyn, Leshe. 
Echinotrochus, sp., Van Phelsum. 
Scutella, § e. f., Re Blainv . R. S. N. lx. 201. 
Echinodiscus, §, Gray, Ann. Phil. 1825. 6. 
