156 H. Rathbun — List of tlie, Brazilian Echinoderms. 



CRINOIDEA. 

 Antedon carinatus? 



Aleck) carinata Leach. 



Comatula carinata Lamarck, Anim. sans Verteb., 2d ed., iii, p. 210, 1840. 



Antedon Bubenii Verrill (non Bolsche), Trans. Conn. Acad., i, p. o65, 18G8 (with?). 



Mr. L. F. de Pourtales, in a recent publication,* refers to Gotnutida 

 carinaUi 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, 

 wdth 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 w^as found 

 in abundance at Rio Forraoso, Pernanibuco, 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 

 niillepores 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. Hartt in 1867, 

 and refeiTed doubtfully to Antedon Duhenii Bolsche, by Prof. 

 Verrill. Another specimen contained in the Peabody Museum of 

 Yale College, was received from Dr. C F. Ltitken, labeled Antedon 

 BraziUensis 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 .1. car hiatus, 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 follow^s : — 

 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. 



