CONTENTS OF THE FOURTH VOLUME, 



EXHIBITING THE FINAL CORRECTIONS AND ADDITIONS. 



Species of questionable indigenousness are printed in italics ; spurious and 

 unrecognized species in nonpareil. The addition of (a. i.) to a species refers the 

 reader to the first Appendix, or Supplementary Notes on the Acephala, in the 

 Second Volume, (a. ii.) to the Appendix at the end of the work. 



GASTEROPODA 

 FERA 



ONCHIDIAD/E 



Onchidium 

 O. Celticum 



LIMACID^ 



Arion 



A. empiricorum 



A. flavus . 



A. hortensis 

 Geomalacus 



G. maculosus 



LlMAX 



L. agrestis 

 L. cinereus 

 L. arborum (a. ii 

 L. flavus 

 L. brunneus 

 L. tenellus 

 L. Sowerbii 

 L. gagates 



TESTACELLID^ 



Testacella 

 T. Haliotoidea 

 T. Maugei 



HELICIDjE . 



VlTRINA 



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