7 Dentaliuin Gadus 

 S Monoculus 

 9 Vermiculum Oblongura 

 10 Dentaliuin Trachea 



Paje. 



496 

 175 



522 

 497- 



2-16 

 314 

 566 

 189 

 267 

 ib. 

 399 

 313 

 214 



331 

 375 

 373 

 376 



379 

 3S0 

 369 

 367 

 372 



VIGNETTE I. , 



1 Bulla liydatis, natural fize, p. 217. 



2 Ditto, with the anterior part of the 



animal, and lateral fin-like mem- 

 branes protruded. 



3 The gizzard or ftomach of the ani- 



mal. Natural iize. 



4 D!tto, as it appears when firll ex- 



trafled from the animal, magni- 

 fied ; Ihev.ing the tipsof the plates 

 A. A. A. covered by a thin mem- 

 brane, and furrounding mui'cular 

 integument, thickened at the 

 upper part B. 

 C The part attached to the mouth, 

 with the Oefophagus, or gullet, 

 communicating with the gizzard. 



D. The intcflinal, or alimentary ca- 



nal. 



5 The gizzard laid open at its anteri- 



or end, fliewing the three corru- 

 gated, corneous plates, E, E. E. 

 with their connetting ligaments 

 F. magnified. 



6 A plate of ditto of its natural uze. 



7 Helix criilata, natural Iize, p. 460. 



8 Ditto, with the anterior part of its 



animal protruded, as m the acl 

 of crawling, magnified 



VIGNETTE II. 



1 Bulla aperta, natural fize, p. 20S. 



2 Animal of ditto, with the Ihrll con- 



cealed under the pofterior Ihield A 



3 The gizzard, of its natural fize, 



compoled of three tellaceous 

 plates, (hewing the finalier plate 

 B ■ ' 



C 



4 Another view of the gizzard, fhew- 



ing the two larger plates D. D. 

 with their conncctinsr liframent. 



E. The gullet. F.'The alimentary 



canai. 



with the connecting ligament 



