(■■OMA'l'UI.II'AK. 



•I 75 



1. perspmo-'^a. 



2. carinnta Lam. 



subsequent ray divisions all resemble the first. Tlie fifth 

 species is peculiar; the third and fifth divisions resemble 

 the first, but the second and fourth consist of only two joints 

 without a syzygy. 



The statements just made are tabulated in the accomp- 

 anying Key to the species described in the following pages. 



Family Comatulidae. 



I. Mouth central or subcentral: anus excentric '). 

 Ambulacra spotted with sacculi. 

 Oral pinnules not provided with a terminal comb. 



Genus Antedon, de Frem. 



A. Ten arms. 



X. 60 overlapping cirrhus-joints . 

 /3. Less than 30 cirrhus-joints. 



I. Arm-joints compressed and 

 keeled. ....... 



II. Arm-joints rounded. 



1. Second radials closely uni- 

 ted laterally. 



Second brachials have a 

 strong backward projec- 

 tion into first brachials. 3. pinmformiK. 



2. Second radials not united 

 laterally. 



Second brachials without 



backward projection . . 4. serripinvn. 



B. Rays may divide three or four times; 

 each division of two joints, the axil- 

 lary without a syzygy. 



X. Later cirrhus joints spiny. 

 I. Rays in close contact; the 

 lower joints of their outer 

 arms flattened laterally . 

 Lower pinnules stout. 



5. flagelldta. 



Mus. Leyd. 



1) The generic diffureuces between Antedon and Actmometra are given in 

 more detail in my First Report on the Comaiulae dredged by the U. S. Coast 

 Snrvey. See the Ball. Mus. Comp. Zool. Vol. IX, n» 4. Cambridge, Ü. S.18S1. 

 Notes from the Leyden IVIuseum, Vol. III. 



