ANALYTICAL INDEX. 



109 



CHAPTER m.—co7itimed. 



Venus casina, . 

 Rarely found alive, 

 Living specimen, 



7. Mya striata fAL truncala), 

 Shell and animal described, 

 Animal quiescent, 

 Plate XIV. described, 



70, 



page 71 

 ib. 

 ib. 



72 

 ib. 



ib. 



71, 72 



8. Pholas crispata, ...... ib. 



Pholas crispata and P. dactylus frequent in the Scotish seas, ib. 

 Inhabit beds of indurated clay, . . • . .73 



Length and form of the shell, .... ib. 



Animal of ascldian nature, . . . . . ib. 



Colour, ....... ib. 



Inactive in captivity, ...... ib. 



Must be quiescent in its natural state, ... ib. 



Plates XV. XVI. explained, ..... 74 



9. Pecten — The Scallop, .... . ib. 



A numerous genus, ...... ib. 



Nature of the Tethys little understood, . . . . ib. 



Shells of all flattened, thin and light, ... ib. 



Pecten opercularis, ...... ib. 



Description of shell and animal, .... ib. 



One of the most restless of the Pecten, . . . 75 



When quiescent the scallop opens, displaying its beautiful parts, ib. 



Pecten obsoletus (P. tic/rinusj, 

 One of the smallest of the genus. 

 Description of the shell and animal. 

 Springs with great fore 3 t'lrougb the water, 

 Specimen survived four months, 



10. Pectdnculus pilosus fP. glycimerisj , 

 Shell and animal described, 

 Plate XVII. described, . 



SoLEN siLiQUA — Razor Shell, 

 Seven specimens on the 19th July 1844, 

 The whole about five inches long. 

 Shell described. 



ib. 

 ib. 

 ib. 

 76 

 ib. 



ib. 

 ib. 



75, 76 



77 

 ib. 

 ib. 

 ib. 



