188 THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 2. A small portion of the lower part of the intestinal canal of the Thylacine to show 



the short erect villi arranged in longitudinal rows. 

 Fig. 3. A portion of the lower part of the intestinal canal of the Thylacine turned inside 



out, and distended with spirit to show the large Peyer's patch (p.). 

 Fig. 4. A portion of the lower part of the intestinal canal of the Thylacine to show a 



small Peyer's patch (p.). 

 Fig. 5. Small intestine of a lion turned inside out to show the fleecy villi. 

 Fig. 6. Genito-urinary organs of the. male Thylacine displayed by the removal of the 

 sacrum. 

 a. Ureter. 

 h. Bladder. 



c. Vas deferens. 



d. Membranous portion of urethra. 



e. Levator penis. 



f. Crus penis. 



g. Erector penis. 



f.g. Crus penis, clothed by the erector penis. 

 h. and h 2 . Cowper's glands enveloped in their muscular capsules. 

 i. Bulb of the penis enveloped by the bulbo-cavernosus muscle. 

 k. Eetractor penis. 

 /. Penis. 

 fib. Prostate. 

 Fig. 7. Bladder and prostatic urethra of the male Thylacine laid open (slightly enlarged). 



c. Bladder. 



a. Bristle in the ureter. 



b. Bristle in the vas deferens. 



d. Prostate. 



Fig. 8. Genito-urinary organs of the male discus, 

 a Kidney 



c. Ureter. 



d. Body of testicle. 



e. Epididymis. 



f. Crus penis clothed by erector penis. 



g. Cowper's gland. 



h. Bulb of penis clothed by bulbo-cavernosus. 



i. Levator penis. 



h. Prostate. 



/. Retractor penis. 



m. Bladder. 



