538 MR. OWEN ON THE MAMMARY GLANDS OF THE ORNITHORHYNCHUS. 
Fig. 2. A magnified view of the mammary areola, showing the orifices of 
the ducts of the glandular lobules. 
Fig. 3. The mammary gland of the Ornithorhynchus paradoxus in a state of 
full development ; the exact dimensions of the gland are preserved. 
Fig. 4. The left ovary and Fallopian extremity of the oviduct of the same 
specimen. (The letters indicate the same parts as in PI. XV.) 
Fig. 5. a. A magnified view of a section of one of the lobules of the mam- 
mary gland, after having been injected with quicksilver, and 
dried. 
b, b. The extremities of the ducts of the other lobules converging as 
they pass through the integument to the mammary areola. 
c. The fibres of the panniculus carnosus. 
d. The integument. 
The preparations described in the preceding paper have been deposited in 
the Museum of the Royal College of Surgeons. 
