CATALOGUE OP ECHINIDA. 
5 
g. Without spine, rather more convex, and very thick and 
heavy. 
h & j. Without spines. 
k. Without spines. 
l. Young. 
1 1 Back fiat, 
■ 2 . Echinanthus scutiformis. 
Shell very thick, ovate, sub-pentagonal, flat, elongate, the 
edge much swollen ; the middle of the back, as far as the end 
of the ambulacra, sunken ; base slightly concave ; ambulacra, 
closed at the end ; vent near the margin. 
Echinus planus scutiformis, Seba Mus. iii. 1. 15, f. 23, 24 ; Ency 
Meth. t. 147, f. 3, 4. 
Clypeaster scutiformis, Lamk. Hist. iii. 291. ( Ency . Meth, t. 147. 
f. 3, 4.) Deslong. Ency. Meth. ii. 199 ; Blainv. D. 8. N. lx. 197 : 
Zoofh. 216 ; Agassiz , Prod. 287 ; Agassiz & Desor, 1. c. 130. 
C. sentiformis (misprint) Blainv. D. 8. JY. ix. 449. 
Scutella clypeastri formis, Blainv. D. S. JY. xlviii. 228 ; Des- 
moid. Syn. Echin. 230. 
Lagana scutiformis, Gray, Ann. Phil. 1825, 6. 
Yar. Minor, Agassiz & Desor, 1. c. 130. 
Clypeaster reticulatus, Desmoid. Tab. 8yn. 214. 
Echinoglycus pentagonus, Van Phelsum, 34. 
Echinodiscus, Gault, t. 110, f. d. 
Echinodiscus reticulatus, Leske, 207, t. 45, f. 8, 9 ; Ency. Meth, 
t. 144, f. 5, 6. 
Echinus reticulatus, a, /3, Gmelin , 8. JY. 3191. 
Scutella reticulata, Blainv. D. 8. JY. xlviii. 228. 
Lagana ovalis, Blainv. Zuph. 196. 
Scutella ovalis, Agass. Prod. 21. 
Hab. Persian Gulph. Red Sea. 
a. Red Sea. Presented by Major Macdonald. 
Vent beneath the margin ; beneath concave ; middle of back- 
convex ; sides rather flat. 
3. Echinanthus Australasia. 
Yent beneath, 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. 
fc 2 
