30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. OO 



ANTEDON HUPFERI (Hartlaub) 



Antedon hupferi 1890. Hartlaub, Nachr. Ges. Gottingen, Mai 1890, p. 171 

 (1). — 1891. Nova Acta Acad. German., vol. 58, No. 1, p. 88, pi. 5, figs. 

 53, 59 (1). 



1. Wapu, Ivory Coast ( West Africa) ; 21 fathoms; blue mud; Capt. 

 Hupfer, December 5, 1887. — One specimen, the type of the species ; 

 this may be described as follows : 



The centrodorsal is thin, with a rather broad dorsal pole 1 mm. in 

 diameter, very slightly concave ; the cirrus sockets are arranged in two 

 irregular rows. 



The cirri are XXVI, 14-16, 12 mm. to 14 mm. long, intermediate 

 in character between those of Antedon bifida and those of A. medi- 

 terranean though slightly nearer the former ; on the short outer seg- 

 ments the dorsal profile is perfectly straight, on the longer centrally 

 constricted segments very slightly concave ; the longest proximal 

 segments are from two to two and one-half times as long as the 

 proximal diameter; the short outer segments are usually half again 

 as long as broad, becoming slightly longer on the last three; the 

 opposing spine is minute, terminal, and sharp ; the longer earlier seg- 

 ments are moderately constricted so that the outer, which are slightly 

 flattened laterally, appear broader in lateral view ; but the difference 

 is comparatively slight. 



The arm structure resembles that of A. bifida. 



The perisomic areas between the IBr series are occupied by tri- 

 angular masses of rather solid perisomic plates. 



P x has eighteen segments of which the first is about as broad as 

 long, the second slightly longer than broad, the third slightly over 

 twice as long as broad, and the remainder three times as long as broad ; 

 the third and following have very slightly produced and very finely 

 spinous distal edges ; the pinnule is very long, though not especially 

 stout ; P 2 and the following pinnules are very much shorter. 



The disk bears a very few small calcareous nodules, more numerous 

 on the base of the anal tube than elsewhere. 



2. Goree, Ivory Coast; ij fathoms; Capt. Hupfer, May, 1891.^ 

 One small specimen. 



ANTEDON MEDITERRANEA (Lamarck) 

 Antedon roseum Hamburg Mus., MS. (4). 



1. Nice. — One specimen. 



2. Naples. — One specimen. 



3. Sicily; Krohn. — One specimen. 



4. Mediterranean Sea. — One specimen. 



