100 ASCIDIA. Class VI. 



3. Rustica. Mem. Wern. Soc. 556. 



* Asc. subconic in the younger state ; in a more 

 advanced state cylindrical ; rough ; color ferru- 

 ginous, apertures red j length two inches ; eat- 

 able. 



On roots of Fucus digit at us near Leith. 



4. Prunum. Gm. Lin. 3124. Mem. Wern. Soc. 557. 



* Asc. oval, smooth, somewhat transparent; 

 sheath white ; one aperture on the side. 

 Leith shore, on Fuci. 



5. Couchi- Gm. Lin. 3124. Mem. Wern. Soc. 557. 



LKGA. 



* Asc. compressed, covered with fragments of 

 shells ; sheath white, changing into blue, oval 

 or cylindric. 



Leith shore, on Fuci. 



Animals of this genus have the faculty of 

 squirting out the water they take in. 



