PLATE XII. 

 Ascidia sordida A. & H. (p. 119) 



FlGr. 



1. Mantle. The male caeca, above blood-channel leading to 



test, are well shown. 



2. Mantle laid open, exposing branchial sac, month, and 



oral lamina, &c. 

 o. Mantle and branchial sac laid open. The ovary is well 



shown, with the oviduct lying close to the intestine. 

 4. Mantle and branchial sac laid open. The nearly circular 



markings are the male caeca. 



Twice natural size. 



