PLATE XXXV. 



FIG. 



1. Styela tuberosa (Macg.). (p. 102) 



2. Sti/ela mamillaris (Gaertn.). (p. 106) 



Each figure represents the test laid open, exposing 

 the mantle, and showing, at the base, the blood-vessel 

 leading from the mantle to the test; and each is one 

 and a half natural size. 



