422 MERISTIC VARIATION. [PART I. 



Metncrinitg. Some species have normally 5, others normally 8 radials. If there 

 are 5, the 2nd and 3rd an- unit>-<l by syzygy and bear pinnules; but if there are 8, 

 both 2nd and 3rd, and the oth and Oth are thus united and bear pinnules. In 

 I'licntiirrinii* the number of radials is two, and this is also the case in one or two 

 fossil Comatula-. I'l'iitni-rinug has normally three radials lik- Anti-don. 

 629. Fentacrlnua mulleri: specimen having in one ray Jour radials, the 2nd and 3rd 

 uniti'il hij mj:ii<jij, though bearing no pinnules. CARPENTER, I.e.; and Chall. Rep. 



xi. 1't. x'xxii. p. all, PI. \\.jig. 2. 







(1) that the number of individuals that have lost antennae a serious injury one 

 may judge and have renewed them, and have bred, can have been enough to lead 

 to tli. . -i;il)lishment by Selection of a distinct and highly special device to be 

 invoked solely on the occasion of mutilation of an antenna ; and also (2) that the 

 1> t.-t iletidl of normal form is of such consequence as to be rigorously maintained by 

 Selection. 



