BY C. HED.LEY, 



171 



crescentie horns. In colour the jaw is dark horny brown, in texture 

 finely striated. Behind, a sort of hood is folded back on the fang. 



The floor of the buccal mass is occupied by the wide lingual 

 ribbon, whose function is to drag into the oesophagus the food ho« d 

 or raked up by the jaw. The radula is much wrinkled. The teeth 

 are excessively variable. In most odontophores each tooth is the 

 exact counterpart of the one in front and behind ; even a mis- 

 shapen or abnormal tooth may be repeated down the whale length 

 of the membrane. But in Aneitea each has individual differences. 

 The base is somewhat quadrate, and in some laterals, emarginate 

 anteriorly. The cutting edge is bent till it is parallel to the plate 

 from which it springs, and is divided into irregular multifid cusps. 



The oesophagus originates in the centre of the roof of the buccal 



mass. Right and left the slender salivary ducts accompany it, 



arriving after a long and tortuous course at the salivary glands, 



which are large, and spread on the anterior walls of the stomach. 



-On receiving the oesophagus, the stomach dilates into a sort of crop. 



The stomach is very long, somewhat square in section, and twisted 



in three spiral turns. The liver occupies the hinder extremity of 

 0- 



the body, its bile ducts communicating with the posterior end of the 

 stomach. A small caacum exists near the commencement of the 

 intestine, which at first winds on the inner side of the spiral stomach 

 till it arrives at its anterior end, then abruptly turning, it retrace* 

 two-thirds of its course, again turning, it follows its previous con- 

 volutions till beneath the shield, when it reaches the anus, situated 

 just below the pulmonary orifice. 



On the floor of the visceral cavity, and attached to the body 

 wall immediately underneath the mouth, extends a white, flat, 

 strap-shaped organ, grooved along its eentre, about 25 mm. in 

 length and 3 mm. in width. It appears to answer to a similar 

 organ, described by Prof. Hutton,* whose function is not under- 

 stood, but supposed to be an organ of smell. 



No great peculiarities are presented by the nervous system. 

 The str mato-gastric ganglia are a small pair situated on the upper 

 posterior side of the buccal body, between the lingual pouch and the 



* Trana. N. Z. Inst. Vol. XIV., p. ICO. 



