-27- 



In a ventral view, the coil of the posterior end of the 

 gland does not, of course, shov/, but at each end is seen a median 

 groove which shows, even through the fibrous envelope; these 

 grooves are caused by the separation of the two parts of the 

 gland, at each extremity, whereas throughout most of their length 

 the halves are in close contact with each other. The numerous 

 transverse folds In the seven pairs of gill pouches are seen in 

 this figure, and also the fibrous character of the anterior v/all 

 of the pharynx. The actual oral opening is not shown. 



Fig. 6 k is a diagrammatic side view of the gland, 

 to show the points through which the sections were cut, and also 

 to show longitudinal space relations, such as size and position 

 of duct, extent of coil, etc. ^>elng carefully reconstructed and 

 drawn by scale, it shov/s these relations with mo3?«- -»r- -l^e-s accu- 

 racy. As is seen from this diagram, the duct lies a little 

 nearer the posterior than the anterior end of the gland, though 

 If the coiled posterior end of the gland were straightened out, 

 the duct would then be considerably nearer the anterior end. 

 By comparing Fig. 6 c with this diagram, it will be noticed 

 that the duct is now a longitudinal silt instead of a nearly 

 circular duct, the lateral growth of the duct apparently not hav- 

 ing kept pace with the longitudinal. Fig. 6 k represents the 

 actual relative longitudina l but not vertical dimensions of the 

 duct. The actual increase in size of the gland may be appreciated 

 by noting that, though all the sections were dravm with a camera. 



