8 FAUNA OF NEW ENGLAND. 



ECHINOIDEA. EUECHINUIDEA. DIADEMATOIDA. 



ECHINOMETRIDAE. 



Echinus drbhachiensis O. F. Mtlller, Zool. Dan. Prod., 1776, 

 p. 235. 



Long Island Sound and northward; low water mark (north- 

 erly) to far beyond the 50 fathom line. 



ARBACIIDAE. 



25 (2) . Arbacia punctulata (Lamarck) Gray. 



Common Bea-urchin. 



A. Agassiz, Rev. Echini, 1872, p. 91, 263, pi. 2, fig. 4. 

 Echinus punctulatus Lamarck Anim. sans Vert., 1816, vol. 3, 

 p. 47. "l'ocean" des Grandes-Indes." 



Off Sankaty Head, Nantucket, through Vineyard and Long 

 Island Sounds, and southward ; low water mark to beyond the 

 50 fathom line. 



CLYPEASTROIDA. 



SCUTELLIDAE. 



26 (3). EcHiNARACHNius PARMA (Lamarck) Gray. 



Sand-dollar. 



A. Agassiz, Rev. Echini, 1872, p. 107, 316, pi. ll^ figs. 4-5. 

 Scutella parma Lamarck, Anim. sans Vert. 1816, vol. 3, p. 11. 

 "l'oceak des Indes." 



Long Island Sound and northward; low water mark to far 

 beyond the 50 fathom Une. 



27 (4). Mellita pentapora (Gmelin) Liltken. 



Key-hole urchin. 



Echinus pentaporus Gmelin, Syst. nat., 1788, vol. 1, pt. 6, p. 

 3189. 



Mellita testudinata Klein. A. Agassiz, Rev. Echini, 1872, p. 

 141, 322, pi. 12c, figs. 1-2. 



