240 A MANUAL OF AMERICAN LAND SHELLS. 



cle. Anal orifice contiguous to and a little above and in advance of 

 the pulmonary orifice. Orifice of organs of generation behind and be- 

 low the right eye-peduncle. Without terminal mucus pore. ^STo ex- 

 ternal or internal shell (see Fig. 260, p. 242). 



Jaw horn-colored, arcuate, with irregular concave margin, bearing a 

 blunt, slightly projecting beak ; terminations blunt ; the anterior sur- 

 face convex, without a decided median carina, and strongly striate or 

 with decided ribs. (Figs. 258 and 259.) 



The genus is not peculiarly American, as it is also found in Asia. 

 In iSTorth America it ranges over the whole Eastern Province, in Mexico, 

 and into Central America and Brazil. 



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. 



I formerly separated from Tehennophorus the species having a ribbed 

 jaw, but finding that in several genera of disintegrated Helix the 

 presence or absence of ribs is not a generic character, I now unite them 

 in one genus. 



Megimathium and Incillaria are names suggested for this genus. The 

 former antedates the name Tehennophorus, but I do not think it advan- 

 tageous to abandon the latter, so long established, especially as Megima- 

 thium is not accompanied with any description by which the genus can 

 be recognized. Philomycus I reject, as Eafiuesque did not correctly de- 

 scribe this genus under that name. 



T. Caroliniensis has an arched jaw (Fig. 258), with blunt, scarcely at- 

 tenuated ends, ribless anterior surface, and decided, blunt median pro- 

 jection to the cutting edge. The jaw is thick, coarse, with vertical and 

 parallel transverse lines of reinforcement, but has no appearance of 

 ribs. 1 have verified this fact by examining numerous specimens of 

 all ages from various parts of the country. My observations have been 

 confirmed by Morse also (Journ. Portland Soc. l!^^at. Hist., 1864, S). I 

 am therefore inclined to doubt the identity of the specimen which 

 Heynemaun (Mai. Blatt., 1862, Plate III, Fig. 12) describes with a 

 ribbed jaw. Bergh (Zool. Bot. Gesell. in Wien, XX, 833) suggests 

 that Heynemaun may have had 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 T. Wetherhi/i. 



