ON HETEROPLANA. 



205 



is orange-yellow. The expanded anterior region and the less 

 expanded posterior region are transparent and almost colour- 

 less, whilst the moss-like, dendritic, anastomosing gonadial 

 tubules are to be plainly seen. 



These transparent extremities of the body (especially the 

 anterior region) possess great adhesive power. There are 

 marginal eyes in front and behind, but not at the sides of the 

 body. The shape of the anterior portion of the body is con- 

 stant and highly characteristic. The two posterior lobes, one 

 smaller and one larger, are also constant. 



Anterior mdr^inaleyes 



CeKb'r^leyes 



, Ri^ht intestinal 

 y diverncula 



Position ofmout/i 

 on.ventra! surface 



Left rudimentary intestinal I 

 diverticula: - - 



Heteroplaua Newton i, nov. geu. et sp. (The arrow indicates the usual 



direction of locomotion.) 

 VOL. 40j PART 1. — NEW SEE. p 



