160 DR. E. LoNNBEBG ON THE [Feb. 20, 



The circulatory system cannot be studied from the material 

 on hand, 1 therefore onlv state the dimensions of the preserved 

 heart of a Musk-ox bull, 18x13^x94 (right) or 10J (left) cm. 

 Lts periphery is 39 cm. The dimensions seem to equal those of 

 common cattle. 



The scrotal sac of the Musk-ox is pendent, with vertical tes- 

 ticles, as Mr. J. Arwidson informs me. The length of a testicle 

 with the epididymis of a hull (killed at Emperor Franz Joseph 

 Fjord, Aug. 26) measured 12| cm., the transverse diameter of the 

 same is about 6 cm. This is about the same size as in cattle, and 

 relatively smaller than in Oris and Copra (for instance the testicles 

 of a young goat are fully 10 cm. in length). The mvsculvs cre- 

 master is well developed, 3| cm. broad. The vasa deferentia are 

 arranged as usual. The thickened terminal portions are 6-7 mm. 

 in length and about 7 mm. thick. They have an exterior muscular 

 roat and a spongious-looking interior surface. The interspaces 

 between these organs are filled with fat. The ductus ejaartatorivs 

 opens on a colliculus seminalis which has the shape of a ridge, but 

 distally this ridge is cleft in two parts, which border a furrow. 



The vesicidu- seminales are flattened, 5| cm. long and 2| cm. 

 broad, organs with a distinctly lobed appearance. They are nearly 

 solid and have a glandular structure. Each opens with a duct 

 into the corresponding ductus tjaculatorius. 



The prostata is only slightly developed, and covered by the 

 thick museulus urethralig. Next to the bladder only small scat- 

 tered lobules are seen, but distally, 44 cm. from the proximal 

 border of this muscle, the gland is thickened to a layer 5-6 mm. 

 in thickness and about 14 cm. in length. 



The glandulce cowperi are well developed, rather triangular 

 in shape, about 3 cm. deep, and nearly 34 cm. long, but flattened 

 on the median side so that the thickness does not amount to more 

 than lg cm. in the transverse diameter. 



So far as the muscles are left on the preparation, the following 

 can be discovered : — a pair of broad ischio-urethrales, a pair of 

 large bidho-cavemosi and the " Afterruthenmuskeln/' which run 

 alongside each other to the S-shaped curve of the penis. There 

 they separate, and continue laterally of the penis to a point about 

 6 cm. from the praeputium, where they insert by means of a sinew. 



The penis opens into a prceputium, which protrudes 6-Jr cm. out- 

 side the integument of the belly. The distal third of this sac-like 

 prominence is exteriorly naked in a bull killed August 29th. The 

 base is covered by dark brown, nearly black hairs partly reaching 

 a length of 18 cm. Distally the hairs get shorter, less numerous, 

 and partly greyish white. The praeputial cavity is distinctly 

 differentiated into three regions with different structure. The most 

 distal of these, which corresponds with the protruding part, is 

 richly provided with longitudinal folds. Its integument has the 

 same structure as the exterior surface of the tip of the praeputial 

 prominence. In a bull killed in July this portion is densely 

 covered by fine hairs reaching a length of 6 cm. This is probably 



