[ 475 ] 



XX. On tke Variations in tke Form of tke Cirri in certain Cvnatul*. ^™^ 

 Carpenter, B.Sc, F.B.S., Assistant Master at Eton College. {Communicated j 

 W. Percy Sladen, Sec. Linn. Soc.) 



(Plate LVII.) 



Read December 3rd, 1885. 



in the same individual. ,./)«/»<•*« with about 



„ shown - V^Al^S^ Otl^i,^, 



,. it. e ti!o mntni'p eirrus and no trace ot an opuubiu a o\> 



proportions from those of the matin e centro-dorsal of any 



penultimate. Both these types are usually to be found on he c 

 Urably mature ***■ ^ ;; while they may a so ; ccui ^^^ penta . 

 which are borne by the Pentacrinoid larva ^^^ Common On the other band, 

 crinoids of other species the small mature for* » tte most commo ^^ 



when studying Actmometra parmcirra I could find no youn corn 



type at all, though the ^^^^^^Tt^een the rudimental and 

 Now in Antedon pAaUmgvm not only is this difleren ^ 



the small mature cirri carried to a very much greater xte nl than 

 the sbape and number of the ^ointsv.y ^^^ in app _ 



ance(Pl.LVHh S s.7^^)t ,£»*«*»; whereas in reality tbey are 



r: e r^^ — — • As i have a large 



n 4. i„ T Or, the Suedes of ^eZecrmws and #wcZwcnnws," Journ. Linn. 



' « Descriptions of new or little-known Comatuke. I. On the fcpecies 



Trans. Linn. Soc. 2nd ser. Zool. vol. ii. 1879, p. 60. ^ 



SECOND SERIES.— ZOOLOGY, VOL. II. 



