Nos. 45^-45^-'] ^4. WE /?/CA AT SOCIETY OF ZOOIaH 



The experiments clearly prove the capacity 

 organisms for regeneration of organs or parts o 

 the more generalized sort to the most spL'ciali/.cd. 

 approximately similar readiness. 



A Nezo Generic l\fe of roh'o^oniuiw : J. IVtcv 

 versity of Pennsylvania. — The annelid referred to i 



a slender, elongated form, an acntel\- conical prostoi 

 a pair of prominent, slightly articulated, apical tent; 

 open mouth, and above it a pair of deep, ciliated. 

 The segments are very obscurely indicated e.xte 

 anterior region but are clearly defined at the caud: 

 body wall exhibits the same succession of layei s a 

 dius ; and internally are found a similar digesti\ 

 eversible proboscis, divided of the c(clom l)v trai 

 segmental dissepiments and dorsal and ventral long- 



gonads, and an epidermal nervous system ending 

 a bilobed cephalic ganglion. In all these and oth 

 the worm resembles Polygordius, but in three import 

 differs from that genus. 



By an arrangement which can be described as 

 of the oblique muscle sheet, the thick la)er of 

 muscles is folded on each side in the form of a 

 ventrolateral ridge in which the muscle fibres assu- 

 verse section) a radial arrangement and undergo c 

 tural changes. Thus is approached the condition fi • 

 of - the more primitive Polychaeta and the manner 

 segregation of the dorsal and ventral longitudinal 

 of annelids may have occurred is indicated. 



At the caudal end the last ten or twelve somites a 

 Two of these bear a pair of seta on each side bi 

 only a single slender, vitreous, capillary seta, whi- 

 each side from the place of insertion of the obliqu- 

 curves over the back for a distance nearly equalling 

 of this region. 



