CATALOGUE OP ECHINIDA. 
35 
verse, ovate, triangular on the lower surface, just with the mar- 
gin covered with three very thin shelly valves covered with 
minute tubercles; the lateral valves triangular, larger, the 
central one linear, erect ; ovarial pores four ; hinder pair 
largest, far apart ; posterior absent ; madreporiform plate cent- 
ral, small. 
Echinolampas, Gray, Ann. Phil. 1825, 7 ; Blainv. B. Sci. Nat. 
lx. 190, 1830 ; Besmovl. Etud. Echin. i. 41, 1835 ; Agassiz & 
Desor, Ann. Sci. Nat. 1847, 163. 
Nucleolites (sp.), Lamk. Syst. 347, 1801. 
Echinanthus, Leske. 
Echinanthus, sp. % Van Phelsum. 
Clypeaster, sp., Lamk. Hist. 
Scutum ovatum, Klein. 
Desmoulin gives this genus to De Blainville, who specially 
quotes my paper for it, and says he never saw the Echinus. 
* Porous band of the anterior and other pairs of ambulacra 
equal , lower side flattish; mouth oblong , transverse , with a 
tubercle between each of the oral ambulacra. 
1. Echinolampas oviformis. 
Shell swollen, ovoide ; ambulacra narrow ; vertex subconical, 
high ; ambulacra linear, lanceolate. 
Seba , iii. t. 10, f. 23. 
Clypeaster oviformis, Lamk. Hist. iii. 292 (E. M. t. 144, f. 1-2) ; 
Beslong , E. M. ii. 200 ; Blainv. Zool. 209 ; Gratel, Mem. Foss. 
Echinus oviformis, Gmelin , S. N. 3187. 
Echinanthus ovatus, Leske a Klein , 191, t. 20, f . c, d ; Breyn , 
Echin. 59, t. 4, f. 1-2. 
Echinus sulcatus, Rumph. 36, t. 14, f. 3. 
Echinorhodum ovatum, Van Phelsum , 38. 
Nucleolites oviformis, Lamk. Syst. 347, 1801. 
Echinolampas * * oviformis, Gray , Ann. Phil. 1825 ; Blainv. 
Zooph. 216; Besmoul. Echin. 342; Agassiz & Besor, 1. c. 
163. 
? Clypeaster Cuvierii, Gratel. Mem. sur Foss. 46, t. 2, f. 22. 
Hab. South Sea, Per on. Mus. Paris. 
a. Not good state. Back subconic, vertex rather anterior, 
hinder dorsal side shelving. • 
b. Broken. Back regular, rounded, rather high. 
