180 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



America it ranges over the whole Eastern Province, in Mexico and into Central 

 America. 



The internal rudimentary, nail-like shell described by Dr. Gray has not been 

 noticed by any American author. 



The habits of the genus are similar to those of the native species of 

 Limax. 



This genus was first described, in 1842, by Dr. Binney (Bost. Journ. Nat. 

 Hist, IV. 163), under the name of 1'ebennophorus. No other descriptions of it 

 had then been published. The species of it have been referred by various 

 authors to other genera, such as Limax, which differs in having a small shield- 

 like mantle, a different shaped jaw, etc. ; and to Philomycus, a genus distin- 

 guished by the absence of a mantle. The latter genus probably existed only 

 in the fertile imagination of Rafinesque, the same "habitat" where flourished 

 Tremesia and Deroceras} 



Ferussac repeats (1823) the description of Rafinesque, but never had seen 

 an individual of the genus. He suggests that Limax Caroliniensis, Bosc, may 

 Belong to it, judging from the figure alone. Gray, H. and A. Adams, and 

 Morch adopt the name of Philomycus, on the supposition that Rafinesque had 

 before him a Tebennophorus when describing Philomycus (in 1820). It may be 

 he had, but as he did not make it so appear, I have preferred adopting the first 

 name evidently applying to it. 



Meghimatium, or Incillaiia, an Asiatic genus, is identical with Tebenno- 

 phorus. 



One species only is known to exist within our limit3, T. Caroliniensis. It 

 has an arched jaw (Fig. 89), with blunt, scarcely attenuated ends, ribless ante- 

 rior surface, and decided blunt median projection to the cutting edge. The 

 jaw is thick, coarse, with vertical and parallel transverse lines of reinforcement, 

 but has no appearance of ribs. I have verified this fact by examining numer- 

 ous specimens of all ages from various parts of the country. My observations 

 have been confirmed by Morse also (Journ. Portland Soc Nat. Hist. 1864, 7). 

 I am therefore inclined to doubt the identity of the specimen which Heyne- 

 mann (Mai. Blatt. 1S62, PI. III. Fig. 12) describes with a ribbed jaw. Bergh 

 (Zool. Bot. Gesell. in Wien, XX. 833) suggests that Heynemann may have 

 had Pallifcra dorsalis before him. Morch, Journ. de Conch. 1865, suggests 

 that it may have been Veronicella Floridana. At all events I do not believe it 

 could have been the species now under consideration. I suspect it to have been 

 Pall if era Wetherbyi. 



The lingual membrane (PI. IV. Fig. O) is arranged as usual in the Helicea. 

 Morse counted 115rowsof 56 — 1 — 56 teeth; another membrane gave 49 — 1 — 49 

 teeth, with 22 perfect laterals ; I have myself counted 56 — 1 — 56 teeth, with 11 



1 See descriptions of these singular animals in the new edition of Rafinesque's Com- 

 plete Conchological Writings. Bailliere, New York, 1864. See also Terr. Moll. I, 

 51, 52. 



