Class VI. MYTILUS, MUSSEL, 235 



GENUS XVII. MYTILUS. MUSSEL. 



Animal, allied to an Ascidia. 



Shell often affixed to some substance by a 

 beard. 



Hinge without a tooth, marked by a longitu- 

 dinal hollow line, sometimes crenulated. 



C':i --y : .-• •• ' 







Gm. Lin. 3350. 



Moni. Test. Br. l66. 



1. CUISTA 



Lin. Tr. viii. 104. 





GALLI. 



* M. with a plaited spinous shell, marked near 

 the margin with a series of protruding points. 

 Found adhering to bottoms of ships. 



Lin. Syst. 1156. No. 249- 



Lin. Tr viii. 105. 



2. RUGOSUS 



Gm. Lin. 3352. 



Mont. Test. Br. l64. 



nigged. 



List.Angl. tab. iv. Jig. 21^ 







M. with a brittle shell, very rugged, and in 

 shape most irregular; usually oblong, and 

 rounded at the ends. Length nearly an inch. 

 Color whitish. 



Always found lodged in limestone. The out- 

 side generally appears honey-combed ; but the 

 apertures are too small for the shell to pass 



