160 Proceed inr/H of the Royal Society of Victoria. 



I. Aliinetitary Canal. — In segment XA'^III. as in Philjemon 

 the eleventh pair of diverticula are given off and extend back- 

 wards through segments XIX., XX., XXI., and XXII. The 

 main part of the alimentary canal passes through the segments 

 XIX. and XX. as a straight tube, but in segment XXI. from 

 its ventral surface arises a very definite duct-like portion leading 

 into the intestine. Where the main part is connected with the 

 narrow duct a very definite cjecum is developed in both these 

 forms but more especially in G. australiensis. The intestine 

 passes back through the remaining segments and opens on the 

 dorsal surface between the 95th annulus and the acetabulum. 

 At the anterior end of the intestine in segment XXI. it is 

 continued forward as a blind pouch in G. australiensis as far as 

 the 78th annulus and in G. ivhitniani to the 83rd. 



II. Posterior Organs. — In connection with the 11th diverti- 

 cula are a pair of posterior organs in structure resembling closely 

 those found in Philtemon. 



The position, however, differs. Instead of lying in segment 

 XIX. and in the mid-ventral line they lie in both G. whittnani 

 and G. australiensis in segment XXI. and occupy a more lateral 

 position. 



The ducts from these organs pass back into the inner and 

 almost extreme posterior surface of the diverticula, and on 

 account of the organs being two segments further back, the 

 ducts are shorter. They are also much wider and can easily be 

 detected in a dissected specimen. The glands do not appear to 

 possess any pigment in the longitudinal grooves. 



III. Salivary Glands. — Connected with the jaws. These are 

 exceptionally well developed in both these species, much more 

 than in Fhilcemon pungens. They are arranged in five distinct 

 groups [Fig. 5], some opening on the jaws between the denticles 

 as in Philaemon, others opening directly into the buccal cavity. 

 Of these there are three distinct masses connected with eacli jaw : 



1. A dorsal mass which is the largest and made up of 



several lobules. This extends as far back as the 

 anterior margin of segment X. [Fig. 5, 1.] 



2. The ventral mass which lies about the same level is 



also lobulated [Fig. f), 3.] 



