214 INTRODUCTION, 



instead of the length of the latter, as usual. The salivary 

 glands are situated one on each side of the commencement 

 of the stomach ; their ducts, just before opening into the 

 buccal body, become dilated. 



Glandina. The oral orifice is triangular, and bounded 

 by three papillated lips, one upper and two lateral. The 

 buccal body is a very long muscular cylinder, a little 

 curved downward at the posterior part. There is no 

 cul-de-sac for the lingual lamina protruding behind ; and 

 the retractor muscle is divided into three fasciculi, one 

 central and passing into the buccal body posteriorly, the 

 others lateral and inserted as usual. Externally, it has 

 a very thin investment of longitudinal muscular fibres, 

 continuous with those of the retractor muscle and the 

 origin of the especial muscles of the tongue. This layer 

 is very delicate and transparent ; and at the anterior 

 third of the buccal body, laterally and inferiorly, it pre- 

 sents several fasciculi, which pass to the tegumentary lips. - 

 Beneath the exterior covering, and readily seen through 

 it, is a thick and strongly fasciculated, transverse layer of 

 muscular fibres. When the buccal body is laid open the 

 oral orifice is found to be continuous with a triangular ca- 

 nal with smooth sides, running one-third its length. At 

 the posterior superior termination of the canal, is the open- 

 ing of the oesophagus and orifices of the salivary ducts. 

 There is no dental plate. The posterior two-thirds of the 

 buccal body is occupied by a long oval organ, composed 

 of numerous,' strong fascicuh of muscular fibres, arising 



