ECHINOIDEA. 29 



EcniNARAcnxius (Scutella) EXCENTRICUS. 

 Scutolla excentrica, Escli., 1829, Zool. Atl., pi. xx.,/ 2. 



Echinarachnius excentricus, Veil., 1S4G, Voi/. Venus, pi. x ; 

 A. Agass., Rev. Ecli., iii., p. 524. 



0, i) " Marro," California - - Exch. 



Hab. California ; Kamschatka, &c. 



AKACHNOIDES. 



ARACHNOIDES, Klein, 1734, Nat. Disp. Ech. ; Af/ass. cf Desor, 

 C. R. Ech. Ann. Sc. Nat,, 1847, vii. (3), p. 134. 



ARACHNOIDES PLACENTA. 



Echinus placenta, Linn., 1758, Si/st. Nat. 



Arachnoides placenta, Agass., 1841, Mon. Scut,, p. 94, tal. 21, 

 fig. 35-42 ; A. Agass., Rev. Ecli., \\\.,p. 530. 



Echinarachnius Zelandire, Gray, 1845, Die/enb. Voy., ii., p. 2G5. 

 Arachnoides Zelandise, Gray, 1855, (7^^. ^tec. ^c/*., p. 14, 

 Jrf- "., / 2. 



( /o/, 4"^-) Port Denison, between tides on sand - Coll. 



(f/} California Exch. 



(//) Sunnier, New Zealand 



Hab. North-East and North Australia ; Port Denison ; 

 Hiuchenbrook Channel ; East India Islands ; Burtnah ; New 

 Zealand. 



ECHINODISCUS. 



EcniNODTScus,m/., 1732, De Echin. Schedirrs. (LesTce, emend) ; 

 A. Agass., Rev. Ecli., i., p. 112; id. 1. c. iii., p. 531; 

 Voy. ChalL, iii., p. 121. 



ECHINODISCUS BIFORIS. 



Et-hinodiscus bisperforatus, LcsJce, 177S, Kl Add., p. 132, 

 pi. xxi.,/! A, B. 



