CATALOGUE OP ECHINIDA. 
15 
with the shell ; ambulacral area of the shell narrow, rapidly 
widening at the end of the ambulacra towards the margin ; 
jaws high ; teeth horizontal ; vent very small, marginal ; ovarial 
pores four, between the apices of the ambulacra, the hinder 
wanting. 
Echinarachnius, Van Phelsum ; Leske, Klein , Echid.; Fleming , 
Brit. An. 479 ; Gray, Ann. Phil. x. 1825, 6 ; Agassiz , Prod. 
Echin. 88, 148 ; Agassiz & Desor, Ann. Sci. Nat. 1847, 133 ; 
Ann. N. H. i. 304. 
Scutella, sp., Lamk. Hist. ii. 11, 1816. 
Echinodiscus, sp., Blainv. Diet. Sci. Nat. lx. 199. 
Lagena, sp., Blainv. Diet. Sci. Nat. lx. 199. 
X. Echinarachnius parma. 
Vent in the margin ; ambulacra petal rather narrow ; the 
series of pores broad, broader towards the end. 
Echinarachnius parma, Gray, Ann. Phil. 1825, 6 ; Agassiz, 
Prod. 188 ; Mon. Scutelle, 89, 148, t, 20, f. 9, 18 ; Agassiz & 
Desor, 1. c. 133. 
Echinodiscus parma, Blainv. D. S. N. lx. 199. 
Scutella parma, Lamk. Hist. iii. 284 ; E. Deslong. Ency. Meth. 
ii. 677 ; Blainv. D. S. N. xlviii. 226; Desmoul. Tab. Syn. 230. 
E. atlanticus, “ Gray ” in Agassiz, Mon. Scutelle, 92-148, t. 21, f. 
32-34. 
Hab. Atlantic Ocean, Kamtschatka. 
a, b, c, d. Some with spines. Labrador. Presented by Lady 
K. Douglas. 
e , f. With spines. North America. 
g, h, i, k. With and without spines. Newfoundland. Pre- 
sented by Mr. G. Shaw. 
I, m, n, o. With spines. Newfoundland. Presented by 
Mr. G. Shaw. Specimens described as Echinarachnius 
atlanticus, Agassiz, Scutelle , ii. 92, 148, t. 21, f. 32-34. 
Var. 1. The oral grooves near the mouth with an obscure 
central keel. 
a. with spines. 
2. Echinarachnius Rumphii. 
Vent just above the margin ; ambulacral petal rather broad ; 
series of pores narrow, scarcely converging together at the 
end. 
Echinarachnius Rumphii, Agassiz, Prod. Echin. 188 ; Mon. Scu- 
telle, ii. 91, t. 20, f. 1-6, 148 ; Agassiz & Desor, 1. c. 133. 
Echinodiscus Rumphii, Blainv. D. S. N. lx. 199 ; Zooph. 199. 
Scutella Rumphii, Blainv. D. S. N. xlviii. 226. 
