14 
CATALOGUE OF ECHINIDA. 
Beslong. E. M. ii. 677 ; Blainv. B. 8. JV. xlviii. 225 ; Desmoul. 
Tab. Syn. 228. . 
Echinarachnius placenta, Gray , Ann. Phil. 1825, 6 ; Cat. Brit. 
Bad. B. M . ; Fleming , B. A. 479 ; Agassiz , , Prod. Echin. 188 ; 
Forbes , Brit. Starf. f. 178, 181. 
Echinodiscus placenta, Blainv. B. 8. N, lx. 199 ; Zooph. 199. 
Echinus placenta, Linn. 8. M. 1105; Blainv. B.8.N. xxiv. 
281. 
Echinodiscus maximus, &c., Breyn. Sched. 64, f. 7, f. 7-8. 
Echinarachnius, Leske ay. Klein , 218, t. 20, f. a, b ; Van Phel- 
sum, 38 ; Gualt , Tkstf. t. 110, f. 9. 
Arachnoides placenta, Agassiz, Mon. Echin. 94, t. 22, f. 35-42, 
149. 
Very young. 
Scutella porpita, Lamk. Ency. Meth. t. 152, f. 3-4; Aqassiz, 
Prod. Echin. 188. 
Hab. Amboyna. 
a, b, c, d. With and without spines. Australia, Cape Up- 
start. J. B. Jukes, Esq. 
e ) fi 9 • With spines. Australia, Cape York. Presented 
by the Earl of Derby. 
h. Australia, Flinders Island. Presented by J. Millingen, 
Esq. 
2. Arachnoides Zelandle. 
Ambulacral area as wide as the inter-ambulacral area ; the 
space on the under side covered with the oblique series of 
pores nearly as wide as the space covered with scattered pores 
between them. 
Echinarachnius Zelandise, Gray, Beiffenbach, Voy. ii. 265. 
Hab. New Zealand. 
a. Without spines. New Zealand. Presented by Dr. 
Deiffenbach. The specimen described by Mr. Gray. 
b. Large, without spines. New Zealand. 
c . Large, the inter-ambulacral area raised and very convex. 
New Zealand. 
B. Infra-ambulacral grooves . branched near end, or waved; vent 
inferior. 
c. Ambulacral petals narrow, open at the end. 
4. Echinarachnius. 
Shell discoidal, depressed, circular, beneath flat ; ambulacral 
petals open ; ambulacral groove of the lower surface straight, 
with one or two straight diverging branches near the margin, 
marked by a plain band; mouth small, circular, on a level 
