488 



section is approximately square. In Paratona elata (Fig. II and Fig. V, 

 1) the gonad has moved inwards from the wall, remaining attached to 

 it by a web of tissue running the length of the gonad. In Cnemidocarpa 

 joannae (Fig. II) the gonad has moved inwards from the wall, but the 

 connection with the wall is by a series of tubular processes or 'vessels', 

 one of which is represented in the figure. In the last two cases the 

 testes have been somewhat enveloped by the broad oviduct and the go- 

 nad in section is approximately circular. 



Kata.tr op a y akut at en si s 



Styela partita 



Bótryorcki i ottanti eus 



Eig. IV. Diagrammatic transverse sections of gonads. 



Another character of more importance than the relation of the go- 

 nad to the wall is the restriction of the testes to one side only of the 

 ovary, as occurs in Paratona elata (Fig. II and V, 1). This (together 

 with differences in the atrial tentacles) is of sufficient importance to 

 warrant the formation of a new genus for this species, as distinct from 

 Pandocia. The gonads in this species are numerous and small. On 

 each side of the body they are oriented in such fashion that in each the 

 end having the openings of the ducts is directed posteriorly toward the 

 atrial siphon. It seemed probable that the testes might be found on a 

 definite side of each ovary, e. g. always on the dorsal side or always on 



