154- 



" With respect to the organs of generation in the male, the texles 

 lay obliquely upon the body of the piihis outside the abdomen, but, as 

 is common to the aquatic Mammalia, without making any projection 

 externally ; the communication between the tunica vaginalis and ab- 

 domen was large enough to allow these glands to be pushed back into 

 the latter cavity, Tliere were no vesiculce seminales, and only a very 

 small prostate. The penis has a pointed glans, and a bone about 

 halt an inch long, of a flattened form with thicker extremities ; into 

 this bone are inserted two retractor and depressor muscles, which arise 

 from the common anterior tendon of the sphincter ani. From "the 

 prepuce to the anus measured 5 inches, the penis being inclosed in a 

 sheath and making no projection externally. 



"The muscles of the fore and hind-flippers were dissected: in the 

 latter are two peculiar muscles for expanding the web of the foot, 

 which have been described in detail by Cams. The extent of origin 

 of the pectoralis major is increased by a cartilaginous process, 3 

 inches long, continued from the manubrium, or first bone of the sternum. 

 This circumstance involuntarily reminds one of the Mole, where a 

 similar structure exists, also in connexion with vigorous rotatory 

 movement of the anterior extremity : but in that animal the structure 

 is by so much the more marked, as progressive motion is attended 

 wath the displacement of denser and more resisting matter 3 it may 

 be said, indeed, to swim in the earth. 



" The following admeasurements are from the larger of the two 

 animals. 



ft. in. lines. 



From the snout to the end of the hind-flippers 3 



^ tail 2 7 G 



• commencement of the fore- 

 flippers 10 



Circumfertnce of the body, taken behind the fore- 

 flippers 1 10 



of the tail, behind the hind-flippers . 3 



Length of the stomach 1 f) 



Circumference of widest part, when distended, .... 1 2 



Length of intestinal canal. . 42 10 



of ccecum 10 



of large intestines 2 0." 



Mr. Owen also read the following " Notes on the anatomv of a 

 young Weasel-headed Arniudillo, Dasijpus fi-ci/ic/us, Linn., which was 

 brought forth at the Society's Gardens on the 3rd of September, and 

 died on the 16th of November. It had nearly acquired its full growth, 

 and had increased in weight during that short period b2oz. 2dr. 

 " Its admeasurements were as follows : — 



in. lines. 

 From the end of the nose to the setting on of the tail 1 1 3 



to the vertex 3 6 



From the vertex to the first band 2 6 



Breadth of the head across the eyes 2 3 



••This species is of a darker colour and more hirsute character than 



