ANNELIDS. I. f)<) 



Otopsis. Iii length this parapodium also calls to mind that of Admetella longepedata. Peculiar is the 

 behaviour of the acicles: These are present in two bundles, a ventral and a dorsal; the ventral bundle 

 consists of three, the dorsal of two acicles (PI. VI., figs. 9 and 10). The ventral of these bundles can 

 be traced to the apex of the parapodium itself, the dorsal is tapering in the base of the dorsal lam- 

 ella and represents the rudiment of a dorsal parapodial branch. Another peculiarity concerning the 

 acicles is their thinness and flexibility. (PI. VI., figs. 9, 7.) 



The parapodium itself constitutes a little bilobate flob, highly overhung by the two, respect- 

 ively dorsally and ventrally situated, lamelliform organs, in my opinion really corresponding to the 

 dorsal and ventral lamella in the parapodium of the Phyllodocids. 



Compound bristles are entirely lacking. All the setse present are exceedingly fine, hairy and 

 pulled out into a delicate long apex. (PI. VI., fig. 12.) 





