630 
ZOOLOGICAL LITERATURE. 
angles of the interambulacral plates. Sp. T. canaliculata, A. Ag. — Caroline 
Islands. 
Chondrocidaris, A. Ag. Scrohicular circle small, not more than half the 
length of the plate ; oral plates covered with long, naiTow spines j median 
amhulacral space with eight rows of small, equal tubercles j primary spines 
large, the angles of their gTooves tending to run into sharp lamellae, and 
spread, fan-shaped, at the end. Sp. C. gigantea, A. Ag. — Sandwich Islands. 
Garelia cinota^ A. Ag. — Kingsmills and Sandwich Islands. Perhaps = 
Echinothrix turcarum (Pet.). Aster opyga suhularis (Ag.) belongs to this 
genus. 
Echinothrix aperta, A. Ag. — Society Islands ; E, scutata, A. Ag. — Sandwich 
Islands. 
Diadema paudspinum^ A. Ag. — Sandwich Islands ; JD. mexicanum, A. Ag. 
— Acapulco \ D. globtdosum, A. Ag. — Kingsmills and Society Islands. 
Echinoddaris davisii (Ag.) — Nanshon, Massachusetts, South of Cape Cod; 
E. indsa^ A. Ag. — Guayamas, Panama. 
Echin'^strephus, A. Ag. Small sea-urchins with tubercles resembling 
those of Hohpneustes in their arrangement, with narrow poriferous zones, 
pores arranged in arcs. Abactinal system raised above the level of ahactinal 
part of test. Large genital plates occupying nearly the whole of this system. 
Actinal [oral] system large, circular, no indentations. Spines long, slender, 
longitudinally striated. Test convex near actinal portion, flattened above, 
the greatest diameter being nearer the ahactinal pole. Auricles of medium 
size, with a large opening and no connecting ridge. Teeth provided with 
transverse arc.” Sp. E. adculatm, A. Ag. — Kingsmills and Sandwich Islands. 
Acroladia cuspidata (A. Ag., — A trigonaria^ Mich, non Ag.) — Mauritius. 
Echinometra vanhrunti^ A. Ag. — Acapulco ; E. rupicola, A. Ag. — Panama ; 
E. microtuherculata, A. Ag. — Sandwich and Kingsmills Islands ; E. viridiSf 
A. Ag. — Florida; E. plana ^ Pi.. Kg. — Hayti. 
Parasalenia, A. Ag., has the raised abactinal system of Salenia, and the 
four anal plates of Echinoddaris ; else like Echinometra ; genital and ocular 
plates smooth ; pores in pairs, forming an irregular vertical line. Sp. P. gra- 
tiosa, A. Ag. — Kingsmills and Society Islands. 
Toxocidaris franciscana, A. Ag. — San Francisco. Helioddaris delalandi 
(Ag.) and H. mexicana (Ag.) belong also to Toxoddaris. 
Lytechinus atlanticus, K. Ag. — Bermudas ; X. variegatus, A. Ag., is the E. 
variegatus of Lamk. (non Rav., which is identical with X. carolinuSf Ag.). 
Boletia granulata^ A. Ag. — Sandwich Islands ; B. rosea, A. Ag. — Acapulco. 
Hippono'e molacea, A. Ag. — Sandwich and Kingsmills Islands; H. nigri- 
cans, A. Ag. — Society Islands; Tripneustes sardicus (Ag.) is referred to this 
genus, Tripneustes (Ag.) being limited to species in which the median ambu- 
lacral and interambulacral space is covered with tubercles. 
Clypeastrid^. 
A. Agassiz refers to Rumphia (Des.) the Luganum lesueuri of Agassiz, a 
Hong-Kong species. Prof. Agassiz mentions it as coming from Guadaloupe ; 
this is probably a mistake.” 
Stolonoclypus rotundas, sp. n., A. Ag. — Acapulco. 
