20" 
3- EuaHtcdoii siiteiisis A. H. Clark. 
A. H. Cl.AKK. Smithsonian Miscellaneous Collections, vol. 60, 19 12, N" 10, p. 31 {Eiiantedon 
sinensis). 
Antedon dc Frcminville. 
Key to the Species of the Genus Antedon. 
a' iS or more cirrus segments, all of which are long, the distal differing but 
.slightly from the proximal: the distal portion of the cirri is not compres.sed 
laterally so that the cirri appear of the came diameter throughout; no 
perisomic interradials in the angles of the calyx; arms slender and very long, 
the proximal triangular brachials being considerably longer than broad. IBr, 
long, not more than three times as broad as long, regularly oblong or 
slighdy trapezoidal, the lateral edges making usually a straight line, more 
rarely a broadly obtuse angle, with those of the IBr^ (axillary) 
b' usually 18 — 20 cirrus segments (from Malaga northeastward along 
the coasts of Spain and France to Italy, thence southward 
t o Sici Iv; Aegea n Sea) mediterranca 
\y usually 24 — 28 cirrus segments (Adriatic Sea) adriatica 
a- I 7 or fewer cirrus segments (more than 1 5 only in exceptional cases) of which 
the proximal are long, but the distal, which are more or less compressed 
laterally, are shorter, usually about as long dorsally as broad, and i)roader, 
usually twice as broad, in lateral view; interprimibrachial plates usually 
prominently developed in the angles of the calyx ; arms comparatively short 
and stout, the proximal triangular brachials being usually noticeably broader 
than long, never longer than broad; IBr^ short, the length rarely so much 
as one third of the width, much narrower distally than proximally, so that 
the lateral angles of the axillaries project beyond the distal angles of the IBr, 
b^ cirri increasing in lateral diameter very gradually, the distal portion being 
not greatly different from the proximal; shortest outer cirrus segments 
measurine alonsf their dorsal profile one third to one half more than their 
lateral diameter 
c' P, with more than 25 segments (coasts of Ireland, southern 
Scotland and Kngland [except the North Sea], the Channel 
Islands, and southward to Cezimbra, Portugal). . . . bijida 
c'- P, with less than 20 segments (Gulf of Guinea, from Wapoo, 
Ivor\- Coast, eastward to II ha das Rolas, off the southern 
coast of Sao Thome) hupjcri 
b- outer cirrus segments strongly compressed laterally, so that the cirri are 
in lateral view nearly or quite twice as broad distally as proximally; 
longer proximal segments half again to twice as long as the median 
diameter; shorter distal segments as long dorsally as broad proximally 
