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DR, S. GADOW ON THE CLOACA AND ON THE 
I. ProctodcBum (P.D.), epiblastic = Vestibulum cloacae, anal chamber, chambre 
copulatrice, bourse clu prepuce, bourse de 
copulation, vestibule genito-excrementitiel. 
With its derivatives : 1. Bursa Fabricii. 
2. Various hedonic glands. 
3. The copulatory organ or organs, the at 
least partly epiblastic nature of which is 
indicated by the frequently developed 
horny armature of the glans, 
II. UrodcBum (U.D.), hypoblastic = Primitive cloaca, middle or urino-genital 
chamber, vessie urinaire, canal uretro- 
sexuel. 
With its derivatives : 1. Urinary bladder, ventral. 
2. Cloacal s. anal sacs of Tortoises, dorsal. 
HI. Coprodceum* (C.D.), hypoblastic = Bectal or innermost cloacal chamber, poche 
vestibulaire du rectum, vestibule rectal. 
The Urodmum is the oldest portion of the whole cloaca, then follows the Procto- 
dseum, and lastly the Coprodseum has secondarily assumed cloacal functions. 
* I propose to designate the typical urino-genital and the fecal chambers the Urodaeum and Copro- 
dasum in accordance with Professor E. Ray Lankester’s terms Stomodasum and Proctodamm ; cf. ‘ Quart. 
Journ. Micr. Sci.,’ April, 1876. 
