CORNISH FAUNA. 



—99*— 



Hie species of which there are Specimens in the Museum are marked * 



_.*©« — 



CORNISH SHELLS. 



CLASS I. 



THE NINTH CLASS OF LAMARK'S AVERTEBRATE 

 ANIMALS. 



The third Order of this Class, and first which possesses 

 a Shell, is that of the 



SEDENTARY ANNULATA. 



They are formed of tubes either membranous or horny, 

 encrusted outwardly with grains of sand and fragments of 

 shells; or solid, calcareous and homogenous. 



To distinguish these from various animals which in the 

 state of Larva construct a case for their temporary pro- 

 tection, it is to be observed that the latter inhabit fresh water 

 only, the former only the sea; and that the contained animal 

 is without eyes, soft, lengthened, wormlike, with segments 

 or transverse wrinkles, mouth nearly terminal, and without 

 articulated feet. It never entirely quits the shed. 



31 ALBANIA. 



DENTALIUM. 



GENERIC CHARACTER: Tube testaceous, nearly 

 regular, slightly curved, gradually diminishing from one 

 end to the other; open at both ends. 



* D. ENTALIS. Turlon's Linneus. Pennant's British 

 Zoology, vol. 4. pi. 90. Borlase's Natural History of 

 Cornwall, pi. 28, fig. 5. Montagu's Testacea Britannica, 

 vol. 2, p. 494. Stewart's Elements of Natural History, 

 vol. 2, p. 421. Greater Tooth Shell. The dead shell is not 

 unfrequently found on many of our shores, about low water 



B 



