1882.] CLASSIFICATION OF THE COMATUL^. 745 



Symbol used. 

 Character. Distichal. Palmar. 



Two joints, the axillary a syzygy . . 2d' 2 p. 



Three joints, the axillary a syzygy. . 3 3. 



Four joints, the axillary not a syzygy 4 4.' 



As in Prof. Bell's system, the insertion of any sign within 

 brackets ( ) would indicate the variable occurrence of the correspond- 

 ing character. 



I subjoin the formulae for some typical examples of the proposed 

 system, all of which, with the exception of Act. jukesi, are to be 

 found described at length elsewhere. 



Antedon. 



rosacea A. 10. 



macronema A. 2. 



palmata A. 2.2.(2). 



rubiffinosa A. 3. 



savignii A. 3.2. 



philiberii A. 3.3. 



a. The 2 might be omitted in accordance with Rules 1 and 2; 

 but its presence more readily indicates the relationship of these two 

 species to Act. novee-guinece, &c. 



ft. Another figure might be usefully added in order to indicate 

 whether the next syzygy is in the third or in some subsequent 

 brachial. 



y. As determined by myself. Miiller's description is incorrect. 



h. The brackets { } are used in order to avoid repeating tiie 2 

 before each letter. The b. might be omitted in accordance with 

 Rule 5, but is retained to indicate the relatioushij) of this species to 

 Act.fimbriata. 



• Hitherto unobserved. 



