PLATE 3 



EXPLANATION OF FIGURES 



12 Transverse section of the cloaca immediately anterior to the cranial end 

 of the median dorsal groove. 



13 Transverse section of the cloaca showing the median dorsal groove, 

 lateral furrows and ventral trough. 



14 Transverse section through the cloaca caudal to the extent of the lateral 

 furrows and immediately cranial to the chamber of the cloaca. 



15 Transverse section of the cloacal chamber, showing the ventrolateral 

 recesses. 



16 Transverse section through the caudal end of the cloacal slit showing the 

 paired masses of abdominal gland tubules. 



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