JR. Rathbun — List of the Brazilian JEchinoderms. 
141 
Verrill, A. E. Comparison of the Tropical Faunae of the East and West Coasts of 
America. Transactions of the Connecticut Academy of Arts and Sciences, vol. i, 
part II, 1867. — Notice of the Corals and Echinoderms collected by Prof. C. F. 
Hartt, at the Abrollios Reefs, Province of Bahia, Brazil, 1867. Trans. Conn. 
Acad., vol. i, part II, 1868. 
HOLOTHURIOIDEA. 
Chirodota rotiferum Stimpson. 
Amer. Jour. Sci., xxix, p. 134, 1860; Verrill, Trans. Conn. Acad., i, p. 371, 1868 ; 
Selenka, Zeitschr. fur Wiss. Zool., 1867, p. 367 ( rotifera ). 
Abrollios Reefs (Hartt, ’67). Plataforma, Bay of Bahia, buried in 
the sandy mud of tide pools (Rathbun). Florida (Pourtales). 
Thyone (Sclerodactyla) Braziliensis Verrill. 
Trans. Conn. Acad., i, p. 370, 1868. 
Abrollios Reefs, under dead corals, in the shallow tide pools and 
holes in the reefs (Hartt, ’67). Plataforma, Bay of Bahia, buried in 
the mud or impure sand, filling the pools and crevices of the rocky 
shores (Rathbun). 
Thyonella, Sp. 
Plataforma, Bahia (Rathbun), associated with Thyone Braziliensis. 
This species of Thyonella resembles very closely in external appear- 
ance and characters T. gemmata Verr.,* of the Southern coast of the 
United States, with which it might readily be united, except for the 
very different nature of its skin-plates. These are mostly of one 
kind, corresponding nearly with the larger, elongate plates of T. 
gemmata. They are large and flattened, and irregularly fusiform, 
oblong or even triangular in outline, with generally two, sometimes 
more, rows of large openings. At times the openings are irregularly 
scattered and of smaller size. In addition there are more rarely 
slender, curved plates, with two or three perforations at each end 
and in the middle, or with a row of perforations. 
Holothuria, Sp. 
Plataforma, Bahia (Rathbun), associated with Thyone Braziliensis. 
A specimen of this species, in alcohol, but not much contracted, 
measures in length, about 125""", greatest diameter, about 24""". The 
* Thyonella gemmata Verr., Amer. Jour. Sci. and Arts, III, vol. iii, p. 437, 1872. 
Colochinis gemmalus Pourtales, Proc. Amer. Ass. Adv. Sci., 185], p. 11. 
Thyonidium gemmatum Selenka, Zeitsehrift fur Wissensehaftl. Zodl., vol. xvii, p. 
345, 1867. 
