MUSEUM OF COMPARATIVE ZOOLOGY. o&O 



No. 11. — List of the Crinoids obtained on the Coasts of Florida 

 and Cuba, by the United States Coast Survey Gulf Stream 

 Expeditions, in 1867, 18G8, 1869. By L. F. de Pourtales, 

 Assist. U. S. Coast Survey. 



(Communicated by Professor B. Pierce, Sup't U. S. Coast Survey.) 



Antedon Hagenii Pourt. (Comatula Hagenii Pourt., Bull. 

 Mus. Comp. Zool. No. 6.) This species approaches nearer A. rosacea 

 than any of the other species found in this region ; it differs, however, 

 in some important parts, such as the form of the centrodorsal plate, of 

 the ovaries, of the joints of the cirrhi, &c. The arms are round, more 

 flexible, and can be coiled entirely over the back. 



Found from 94 to 195 fathoms. 



Antedon meridionalis A. Ag. This species ha3 long been 

 known, from the coast of South Carolina, under the manuscript name 

 of Comatula Holmesi Ag., but appears to have never been described. 

 The above name was given to it by Mr. A. Agassiz in the " Sea-side 

 Studies of Natural History." 



Ten arms, centrodorsal plate flat, with about 15 cirrhi around its 

 circumference. These are rather short, formed of 9 or 10 joints 

 somewhat compressed laterally, the 3d, 4th, and 5th longest. The 

 last joint with a strong claw, penultimate with an opposing point. 

 Radials very short, the first almost concealed by the central plate. 

 Axial radial also short and triangular. First brachials short and in 

 contact with each other in a pair by nearly their whole side. First 

 syzygiuin at the 3d brachial. Joints — of which there are generally four 

 to a syzygium — very oblique, with raised and serrated edges. First 

 pinnule rather long; the 5 or G first joints webbed by the perisora. 

 The succeeding pinnules rather short, increasing again to the middle 

 of the arm, formed of 15 or 16 joints, of which the 5 or 6 first ones 

 are short triangular. Mouth eccentric, anus central ; small calcareous 

 concretions in the neighborhood of the mouth and brachial channels. 



Color purple or yellow, or variegated of those two colors. Diameter, 

 when fully expanded, 4 or 5 inches. 



One specimen in 35 fathoms west of the Tortugas, and a large number 

 off" French Reef in 45 fathoms. It is also found off the coast of South 

 Carolina, but the Alectro dentata Say, from the coast of New Jersey, 



