Cl. VI. LIGULA. SPOON-HINGE SHELL, m 



GENUS V. LIGULA. SPOON-HINGE 

 SHELL. 



Animal, an Ascidia. ■■. ; 



Shell equi valve. - 



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. tah. 26./. 3. j, Prisma- 



TICA. 



* 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. 



Mont. Test. Br. Sup. 25. 



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

 wrought with distant, obsolete, elevated, longi- 

 tudinal stricB ; inside plain ; margin smooth ; 

 diameter one-tenth of an inch. 



SUBSTRI- 

 ATA. 



