OF PERIPATUS CAPENSIS. 88 I 



be traced back even beyond the end of the pharynx, and serves 

 along its whole length for the attachment of muscles. 



The greater part of the buccal cavity is filled with the tongue 

 and jaws just described. It opens dorsally and behind by the 

 mouth into the pharynx, there being no sharp line of demarca- 

 tion between the buccal cavity and the pharynx. Behind the 

 opening into the pharynx there is a continuation of the buccal 

 cavity shewn in transverse section in fig. 13, and in longitudinal 

 and horizontal section in fig. 17, into which there opens the 

 common junction of the two salivary glands. This diverticulum 

 is wide at first and opens by a somewhat constricted mouth into 

 the pharynx above (PL 49, fig. 13, also shewn in longitudinal 

 and horizontal section in fig. 17). Behind it narrows, passing 

 insensibly into what may most conveniently be regarded as a 

 common duct for the two salivary glands (PI. 49, fig. 17). 



The Salivary Glands. These two bodies were originally 

 described by Grube, by whom their nature was not made out, 

 and subsequently by Moseley, who regarded them as fat bodies. 

 They are placed in the lateral compartments of the body-cavity 

 immediately dorsal to the ventral nerve cords, and extend for 

 a very variable distance, sometimes not more than half the 

 length of the body, and in other instances extending for nearly 

 its whole length. Their average length is perhaps about two- 

 thirds that of the body. Their middle portion is thickest, and 

 they thin off very much behind and to a slight extent in front. 

 Immediately behind the mouth and in front of the first pair of 

 legs, they bend inwards and downwards, and fall (fig. 7) one on 

 each side into the hind end of the narrow section of the oral 

 diverticulum just spoken of as the common duct for the two 

 salivary glands. The glandular part of these organs is that 

 extending back from the point where they bend inwards. This 

 part (fig. 1 6) is formed of very elongated cells supported by 

 a delicate membrana propria. The section of this part is some- 

 what triangular, and the cells are so long as to leave a compara- 

 tively small lumen. The nuclei of the cells are placed close to 

 the supporting membrane, and the remainder of the cells are 

 filled with very closely packed secretory globules, which have 

 a high index of refraction. It was the presence of these globules 

 which probably led Moseley to regard the salivary glands as fat 



