Cl. VI. LIGULA. SPOON-HINGE SHELL. 



im 



GENUS V. LIGULA. SPOON-HINGE 

 SHELL. 



Animal, an Ascidia. 



Shell equivalve. 



Hinge, with a broad tooth on each valve pro- 

 jecting inwards, furnished with a cavity 

 for the reception of the connecting car- 

 tilage. 



Mont. Test. Br. Sup. 23. tab. 26. f. 3. 



* Li. shell oblong, flat, thin, glossy, white, con- 

 siderably attenuated at one end, and obsoletely 

 striated concentrically ; beak nearer the smaller 

 end ; length three-eighths of an inch, breadth 



six-eighths. 



Coast of Devonshire. 



]. PRISMA- 

 TICA. 



Mont. Test. Br. Sup. 25. 



* Li. with a white, sub-ovate, sub-pellucid shell, 

 wrought with distant, obsolete, elevated, longi- 

 tudinal strice ; inside plain ; margin smooth : 

 diameter one-tenth of an inch. 



SUBSTRI- 

 ATA. 



