15G R. Rathbun — List of the Brazilian Echinoderrns. 
CRINOIDE A. 
Antedon carinatus? 
Alecto carinata Leach. 
Cornatula carinata Lamarck, Anim. sans Yerteb.. 28. ed.. iii, p. 210, 1840. 
Antedon Dubenii Terrill (non Bolsche), Trans. Conn. Acad., i. p. 365, 1868 (with?). 
Mr. L. F. de Pourtales, in a recent publication,* refers to Cornatula 
carinata Lam., with query, a species of Antedon which he states to 
be common on the Brazilian coast. He does not, however, give the 
exact localities from which the specimens he has examined were 
obtained. Only two species of Antedon were collected by the mem- 
bers of the Geological Commission. One of these is a small species, 
with more than ten arms, to be described further on ; the other is ten- 
armed, and, from comparisons I have been able to make, is evidently 
identical with the form mentioned by Mr. Pourtales. It was found 
in abundance at Rio Formoso, Pernambuco, at many localities in the 
Bay of Bahia, and at the Abrolhos Islands ; but probably ranges 
along the entire coast, at least as far south as Rio de Janeiro. It 
generally occurs in holes and crevices of the rocky shores, and of 
millepores and other corals, clinging tightly by means of its cirri, 
but completely exposing its arms. A single, much mutilated speci- 
men was collected at the Abrolhos Islands, by Prof. Ilartt in 1867, 
and referred doubtfully to Antedon Dubenii Bolsche, by Prof. 
Merrill. Another specimen contained in the Peabody Museum of 
Yale College, was received from Dr. C. F. Liitken, labeled Antedon 
Braziliensis Liitk., Rio de Janeiro. This is apparently the same as 
the form now under discussion, and it approaches in many of its 
characters more closely the A. carinatus of the Mauritius and Zanzi- 
bar, than do the specimens from northern Brazil. 
The Peabody Museum possesses several specimens of Antedon from 
Zanzibar, which, although I found them undetermined, agree so 
closely with the original descriptions of A. carinatus , as to leave 
little doubt of their identity. The Brazilian forms that I have been 
able to study differ from the Zanzibar specimens about as follows : — 
The A. Braziliensis , above mentioned, has the dorsal side of the 
arms rather more strongly carinate, the tubercle projecting from the 
median outer edge of each joint being usually very strongly marked, 
and often reaching inward one-half to two-thirds the length of the 
joint, as a very prominent, slightly elongate, sub-angular ridge, with 
a minutely spinose surface. One or two joints alternate between the 
* Bull. Mus. Comp. Zoology. Cambridge, v, No. 9, p. 214, 1878. 
