OCR Text |
Show 160 DR. E. LONNBERG ON THE [Feb. 20, The circulatory system cannot be studied from the material on hand, I therefore only state the dimensions of the preserved heart of a Musk-ox bull, 1 8 x l 3 | x 9 | (right) or 104 (left) cm. Its periphery is 39 cm. The dimensions seem to equal those of common cattle. The scrotal sac of the Musk-ox is pendent, with vertical testicles, as Mr. J. Arwidson informs me. The length of a testicle with the epididymis of a bull (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 Ovis and Capra (for instance the testicles of a young goat are fully 10 cm. in length). The musculus cre-master is well developed, 3| cm. broad. The vasa deferentia are arranged as usual. The thickened terminal portions are 6-7 m m. in length and about 7 m m . thick. They have an exterior muscular coat and a spongious-looking interior surface. The interspaces between these organs are filled with fat. The ductus ejaculatorius 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 vesicula* seminales are flattened, h\ 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 ejaculatorius. The prostata is only slightly developed, and. covered by the thick musculus urethrcdis. Next to the bladder only small scattered lobules are seen, but distally, 4| cm. from the proximal border of this muscle, the gland is thickened to a layer 5-6 m m. in thickness and about 1| cm. in length. The glandulce cowperi are well developed, rather triangular iu shape, about 3 cm. deep, and nearly 3| cm. long, but flattened on the median side so that the thickness does not amount to more than 1| cm. in the transverse diameter. So far as the muscles are left on the preparation, the following can be discovered:-a pair of broad iseliio-urethrales, a pair of large bulbo-cavernosi 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. Therm's opens into a praputium, which protrudes 6\ cm. outside the integument of the belly. The distal third of this sac-like prominence is exteriorly naked in a bull killed August 29tb. 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 preputial 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 era. This is probably |