2(4 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 fasciculi of muscular fibres, arising 
