TEBENNOPHORUS. 



205 



and before the respiratory orifice. Male and female organs 

 with the same orifice, behind and below the right eye- 

 peduncle. 



No internal shell. 



The Asiatic genus 3Ieghimatium is also referred to this family, 

 it being by some considered identical with the strictly American 

 genus Tebennophorus. 



TEBEIVIVOPHORUS, Bixn. 



Body somewhat flattened, terminating obtusely, or in a some- 

 what truncated form. Back convex, more flat when fully ex- 

 tended. Integuments with irregular vermiform glands, anasto- 



Fig. 529. 



Thy. n30. 



Teheit nophorus earolinnisis. 



rnosing with each other, and having a general longitudinal 

 direction. Mantle covering the whole body. Locomotive disk 

 expanded at its margin, and visible beyond the sides of the 

 mantle ; no median band. Respiratory orifice near the head. 

 Anal orifice contiguous to, and a little above and 

 in advance of the pulmonary orifice. Orifice of 

 organs of generation behind and below the eye- 

 peduncle. .Without terminal mucus pore. 



Jaw horn-colored, arcuate, with a slightly den- 

 ticulated or irregular concave margin, bearing a 

 blunt, slightly projecting beak, terminations l)lunt ; the anterior 

 face is convex, without a decided median carina, and strongly 

 striate. 



The lingual membrane is very broad, composed of teeth of a 

 short, conical form, the centrals symmetrical and smaller, the 

 laterals inclined towards the central ; apex of each sharper. 



Jaw of 

 Ti-firn nophorus 

 caroUnensi.i. 



