250 Janet W. Raff : 



oesophagus, in segment 16, the lining resembles that in segment 

 7, but here there is a deep layer of peritoneal cells, and also the 

 lining is ciliated, this being one of the restricted places in 

 which I have found cilia [Fig. 9]. 



2. — Megascolex fielderi, Spencer. 



Perichaeta fielderi, Spencer. P.R.S. Victoria, 1892. 

 Plate L., Fig. 11. 



(a) Macroscopic. — Buccal cavity and pharynx in segments 1-3. 

 Crop in 4. Gizzard in 5. Oesophagus in 6-16 ; simple in 6-10, 

 vascular swellings in 11-14, the one in 11 being small. In 15 

 and 16 the canal is simple and very vascular. Large intestine 

 begins in 17, and has a large lumen. Special bunches of 

 nephridia are present in the pharyngeal region. 



This description differs slightly from that given by Professor 

 Spencer. 



(b) Microscopic. — In segments 6-10 the lining is thrown into 

 deep, wade folds, and has goblet cells very largely developed in it. 

 The circular and longitudinal muscle fibres are well developed, 

 and there is a large blood supply. Vascular swellings, and 

 simple canal in segments 15 and 16, similar to Megascolex 

 dorsalis, but there are no cilia. 



3. — Megascolex tenax, Fletcher. 



Perichaeta tenax, Fletcher. Proc. Linn. Soc N.S.W., 

 vol. ii., 1887. 



Plate L., Fig. 12. 



(a) Macroscopic. — Buccal cavity and pharynx in segments 1-3. 

 Crop in 4. Gizzard in 5. Oesophagus in 6-15 ; simple in 6-10 

 and 14-15, calciferous glands in 11, 12 and 13. The glands are 

 paired and constricted off from the median canal by very short 

 ducts. Large intestine begins in 16, the first portion in seg- 

 ments 16-24 being sacculated as usual, but beyond segment 24 

 there is a constriction in the middle of each sacculation. 



(b) Microscopic. — Oesophagus in the simple portion has a 

 narrow lumen, with small folds in the lining. The columnar 



