CATALOGUE OF ECHINIDA. 
/ 
*"* Vent beneath the margin; shell flat beneath , except just near 
the mouth. 
8. Echinanthus sub-depressus. 
Back depressed, rather raised in the centre, petal moderate, 
nearly two-thirds the length of the space from the vertex to 
the side edges ; jaws depressed, not so high as broad. Cavity 
on the broad septa on the edge. 
Echinanthus ovalis, Gault, t. 110, i. a. 
Echinanthus humilis, /3, Leske ap. Klein , t. 19, f. a. b. 
Scutum angulare humile, /3, Klein Gall. 86 t. 10, f. 13. 
Echinus rosaceus, /3, Gmelin , S. JV. 3186. 
Echinanthus sub-depressus, Gray , Ann. Phil. 1825, 5. 
Clypeaster rosaceus, /3, Lamk. Hist. iii. 289. 
Clypeaster rangianus, Desmoul. Etud. Echin. i. 62, t. 1 ; Tab. 
Syn. 214 ; Agassiz <P Desor , 1. c. 130. 
Echinorhodum, n. 5 ; Van Philsum , 38. 
Hab. East coast of Africa, Rang. 
a. Without spines, showing the internal cavity and jaws. 
b. Without spines. 
9. Echinanthus exflanattjs. 
Depressed, much expanded ; centre of the back rather con- 
vex ; ambulacra occupying rathef 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 end ; ca- 
vity with thin concentric lines of short compressed columns 
near the margin ; jaws depressed. 
Echinanthus explanatus, Gray, Proc. Zool. Soc. 1851. 
Hab. Mauritius. 
a. Without spines, showing the internal cavity and jaws. 
10. Echinanthus placunarius. 
Back depressed ; ambulacral petals short, only half as long 
as from the summit to the edge ; under surface flat, except just 
close to the mouth ; margin thin ; cavity with concentric 
ridges near edge ; the ambulacral lines close together at the 
outer end. 
Capitis mortui, Seba Thes. iii. t, 13, f. 11, 12, not good. 
Echinanthus humilis, Leske ap. Klein , 188, t. 19, f. c. d. 
Scutella ambigua, Lamk. Eccpl. Ency. Meth. t. 145, f. 3, 4. 
Scutella ambigena, Lamk. Hist. iii. 286 ; Deslonq, Ency. Meth. 
ii. 678. 
Scutum angulare, y, Klein , Gall. 86, t. 10, f. c. 
Clypeaster ambigenus, Blainv. Diet. S. N. xlviii. 299, lx. 197 ; 
