ECHINOIDEA. 29 
Ecumaracuntus (Scutella) EXCENTRICUS. 
Scutella excentrica, Hsch., 1829, Zool. Atl., pl. xx., f. 2. 
Echinarachnius excentricus, Val., 1846, Voy. Venus, pl. x ; 
A. Agass., Rev. Ech., iii., p. 524. 
(a, b) “ Marro,” California - - - - Exch. 
Hab. California; Kamschatka, &c. 
ARACHNOIDES. 
ARAcHNOIDES, Alein, 1734, Nat. Disp. Ech. ; Agass. § Desor, 
C. R. Ech. Ann. Sc. Nat., 1847, vii. (8), p. 184. 
ARACHNOIDES PLACENTA. 
Echinus placenta, Linn., 1758, Syst. Nat. 
Arachnoides placenta, Agass., 1841, Mon. Scut., p. 94, tab. 21, 
Jig. 85-42 ; ‘A. Agass., Rev. Ech., iii., p. 580. 
Echinarachnius Zelandixe, Gray, 1845, Dieffenb. Voy., i1., p. 265. 
Arachnoides Zelandiw, Gray, 1855, Cat. Rec. Ech., p. 14, 
plaids, f.2. 
(a to f, Fc.) Port Denison, between tides on sand - Coll. 
(g) California - - - . - - - Exch. 
(h) Sumner, New Zealand - - - ety 
Hab. North-East and North Australia; Port Denison ; 
Hinchenbrook Channel ; East India Islands; Burmah ; New 
Zealand. 
ECHINODISCUS. 
Ecurtnoptscus, Breyn., 1732, De Echin. Schedias. (Leske, emend) ; 
AneAguss., lev, Heh. 1., p. V2; td. 1... il, py OBL ; 
Voy. Chall., ii., p. 121. 
EcHINODISCUS BIFORIS. 
Echinodiseus bisperforatus, ZLeske, 1778, Kl. Add., p. 182, 
pl. Xx1., fi A, B. 
