withstanding the difference which really exists in the ge- 

 neral hahit, in the labrum a columella, it w^ould caalesce 

 with it, were it not that the inhabitant possesses characters 

 which cannot justify the union. Ferussac was aware of 

 these distinctions, and after extracting what we formerly 

 published relative to the characters of the animal, he states, 

 " Si cependant on les reconnoit dans toutes les autres es- 

 peces du groupe auquel elles appartiennent, ou devra en 

 faire un genre apart, ou rais;uillette et quelques unes des 

 especes analogues, que nous y reunissons, entreront par 

 I'influence des rapports generaux de leur coquille," and 

 " De toutes les especes que nous reunissons dans les helix, 

 aucunes, sans doute, n'ofii'ent des caracteres de dissem- 

 blance aussi prononces." 



Having unfortunately mislaid a sketch of the animal, 

 taken during a visit to Florida, I can now only repeat 

 my description of it as published in Mitchell's edition of 

 Nicholson's Encyclopedia. Animal elongated, as long 

 again as the shell, granulated ; tentacula four, superior ones 

 oculiferous, abruptly deflected at tip, beyond the eyes ; in- 

 ferior ones much shorter, and abruptly deflected at tip ; 

 lips beneath the tentacula, elongated, palpiform, almost as 

 long as the superior tentacula, retractile, generally more or 

 less recurved, compressed, attenuated, and acute at tip, and 

 forming a considerable interval between their prominent 

 bases. When the animal is in motion, the elongated lips 

 are used as tentacula to feel the way. 



PXJkTE XX. 



