234 CALIFORNIA ACADEMY OF SCIENCES. 



connects the anterior end of the pharynx with the body- 

 wall of somite iv. Two more muscular bands run cen- 

 trally backwards, around them being grouped the upper 

 septal glands in somite v (fig. 2, s.g-/.). At the place 

 of attachment to the pharynx these muscular bands are 

 straight and less separable in distinct bands, directly be- 

 coming more contractile and wavy before emerging from 

 the pharyngeal region. These muscular bands are partly 

 covered with large salivary glands (fig. 2, si. gl.). 



Salivary Glands. While yet in the pharyngeal region 

 the pharyngeal muscles are covered with large salivary 

 glands, in many respects similar to the septal glands al- 

 ready described. The salivary glands are situated in 

 somites iii and iv and partially in ii. They form ap- 

 parently one connected mass, exteriorly and posteriorly 

 differentiated into a number of broad and narrow lobes, 

 some of which appear to be constant in shape and posi- 

 tion, or at least vary but little. On the upper surface of 

 this pharyngeal mass there are thus seen two long narrow 

 glands (fig. 2, 5/. gl.), one on each side of the median 

 line, and running backwards through somites v, vi and 

 vii. The lobes of the other more lateral salivary glands 

 are broader and more or less multi-lobed. This part may 

 again be distinguished as one lateral and one inferior 

 part, the latter one being the smallest, and, as regards its 

 position, almost resting on the upper part of the oesopha- 

 gus. Towards the muscular pharynx all these glands 

 diminish in thickness, and in the immediate vicinity of 

 the pharynx proper they are entirely crowded out by the 

 muscular bands which closely cover the pharyngeal sur- 

 face. On the uppermost part of the pharynx, under the 

 cerebral ganglion, and in front of it another group of 

 salivary glands is seen, but of diminished size. The 

 whole mass of glands and muscles project considerably 



