60 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



the small intestine, it resembles Limax campestris. The rectum, in its 

 course to the pulmonary orifice, perforates the renal organ. 



Tebbnnophorus. The buccal body has a conspicuous curve down- 

 wards, and the buccal pouch of the lingual lamina is longer than in 

 Limax or Avion, and curves upwards from the postero-inferior part of 

 the buccal body. The retractor muscle of the latter is split into two 

 bands as in Avion, but one stronger. There are also two small retrac- 

 tor muscles to the lower lip. The oesophagus is comparatively long. 

 The stomach is cylindrical and sacculated, and, posteriorly with the 

 small intestine, forms a wide cul-de-sac. The small intestine is like 

 that of L. campestris and Avion. The salivary glands occupy a position 

 on each side of the oesophagus. The ducts are tortuous. 



Prophysaon, Hemphillia, Ariolimax. In my descriptions of these 

 genera I have included the digestive system, which has the same gen- 

 eral arrangement as in Limax. 



It appears that no generic characters may be found in the digestive 

 system of the respective genera, excepting the jaw and lingual mem- 

 brane, which are treated in full in Chapter III. 



Veroxicella. The buccal body possesses no retractor muscle. The 

 dental plate, or jaw, is broad, and, upon the anterior surface, has a pec- 

 tinate appearance, from the numerous ribs upon it. Its cutting edge is 

 devoid of the conical toothlet. The oesophagus is moderately long and 

 capacious. The stomach is cylindrical and sacculated, and posteriorly 

 forms a deep, capacious cul-de-sac, independent of the small intestine. 

 It is strongly muscular and shining, the transverse muscular fibres being- 

 very distinct. The anterior hepatic duct opens into the angle formed 

 by the cul-de-sac and the intestine, the posterior into the fundus of 

 the latter. The small intestine is pretty uniformly cylindrical, and 

 holds the usual course to near its termination in the rectum, when to 

 reach the latter it turns abruptly backward, and joins it on the right 

 side, just posterior to the middle of the body. The rectum is straight, 

 and proceeds backwards, along the right side of the body, within the 

 pulmonary cavity, and terminates between the extremity of the tail 

 and the pedal disk, at the side of the pulmonary orifice. The salivary 

 glands are arborescent, or fasciculated in appearance. The ducts are 

 short and delicate. The lobuli of the liver are looser, or more sepa- 

 rated, than in the preceding genera. 



The Genera of Disixtegkated Helix. The buccal body has the 

 same ,'ippcarance, generally, as in the slugs. The retractor muscle is 



