72 TESTACEA. 



no demonstrations of life. I endeavoured to separate the valves : they 

 seemed to have some artificial adhesion by the edges. When the valves 

 were separated, the animal seemed quite fresh, not in the least decayed ; 

 and, put into recent sea water, the frills swelled. But the foot did not 

 stretch ; nor can I say there was any vigour that would have opened 

 the shell. 



PLATE XIV. 



FIG. 9. Venus casina. 



7. MTA STRIATA (M. truncata). Plate XV., Figs. 1, 2. 



Shell rudely oval, extending two inches by one and a half. Colour 

 brownish grey. Animal somewhat of ascidian nature, and bearing con- 

 siderable resemblance to that of the Pholas. It is very large in propor- 

 tion to the shell, extending in whole about six inches ; the anterior ter- 

 minates in two low fringed orifices, of which the larger is two lines in 

 diameter ; the opposite extremity, a white foot protruding behind. A 

 dark thick rugous skin, like an epidermis, covers the animal, with a longi- 

 tudinal narrow cleft, exposing the white flesh within. 



This animal is very quiescent. It squirts the water two feet from 

 one of the orifices. 



Only two specimens have occurred, both of nearly the same 

 dimensions. 



PLATE XV. 



Fio. I. Mya striata (M. truncata), side. 

 2. Foot and cleft. 



8. PHOLAS CRISPATA. Plate XV., Figs. 3, 4, 5, 6. Plate XVI, 

 Figs. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. 



Two species of this genus are the more frequent in the Scotish seas, 

 the Pholas crispata and P. dactylus. There seems little difference in 



