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Show 416 DR. M. WATSON ON THE MALE [Apr. 16, Fig. 5. Rhynchonella sicula (recent), p. 413. 6. R. sicula (fossil), p. 414. 7. Discina atlantica, p. 415. Observation.-In the enlarged figure of Terebratula vitrea, var. sphenoidea, the striae are much too strongly marked. In the figure of Biscina atlantica the setae are represented too thick. 2. On the Male Generative Organs of Hycena crocuta. By M . W A T S O N , M.D., Professor of Anatomy, Owens College, Manchester. [Received April 5, 1878.] (Plates XXIV. & XXV.) In a previous communication ] I laid before this Society a description of the female organs of Hycena crocuta, and having lately had an opportunity of examining those of an adult male of the same species, have thought that a description of these would not be altogether uninteresting, more especially as, so far as I can ascertain, no complete account of them has hitherto been published. For the sake of comparison I shall follow the plan pursued in the paper referred to, describing in the first place the external, and secondly the internal organs of generation. External Parts. The anal and perineal regions of the male resemble so closely those of the female that without a very accurate examination it is impossible to distinguish between the sexes. In both there is a well-marked glandular pouch above the anus ; in both there are cutaneous elevations corresponding in appearance to that of the scrotum in the males of allied species; and in both there is an elongated, pendulous, penis-like body, surrounded by a prepuce, and perforated at its extremity by a single aperture of small size. Penis.-This organ is directed forwards, and lies along the middle line of the perineum as in the dog. The free portion, consisting of a central glans surrounded by a thick fleshy prepuce, projects forward and downward from the level of the abdominal wall, and measures one inch and a half in length. The glans is conical in form and without distinct corona, the urethral aperture being situated on the apex of the cone. The inferior lip of this aperture is prolonged forward to some extent, so that seen from the side the glans presents the appearance of being obliquely truncated from before backward and upward as in the female, although the truncation is not so well marked as in that sex. In the flaccid condition of the organ the glans is for the most part concealed hy the prepuce, its apex only being exposed. The latter portion is of a dark blue colour, and its surface is much corrugated, whilst so much of the glans as is concealed by the prepuce is of a purplish colour and presents no trace of corrugation. Its basal two thirds are moreover covered by small 1 Proc. Zool. Soc. May, 1877. |