. Fig. 6. Horizontal section of the Pro- stata and lower part of the urinary canal in a 1-23 m. Fin whale foetus. Ventral view, (x 2.) a. Urinary canal. b. Blind latero-dorsal terminations of the prostatic portion of the urethra. c. Urinary pore and crista urethrae. d. Seminal pores. e. Dorsal ridge of the prostatic part of urethra. /. Compressor prostatae muscle. The uterus masculinus No trace whatever of the uterus masculinus or sinus pocularis was found in either of the foetuses examined. This is surprising in view of the fact that previous authors, with the exception of Yves Delage (1885)
. Fig. 6. Horizontal section of the Pro- stata and lower part of the urinary canal in a 1-23 m. Fin whale foetus. Ventral view, (x 2.) a. Urinary canal. b. Blind latero-dorsal terminations of the prostatic portion of the urethra. c. Urinary pore and crista urethrae. d. Seminal pores. e. Dorsal ridge of the prostatic part of urethra. /. Compressor prostatae muscle. The uterus masculinus No trace whatever of the uterus masculinus or sinus pocularis was found in either of the foetuses examined. This is surprising in view of the fact that previous authors, with the exception of Yves Delage (1885) and Meek (1918), have found traces of the uterus masculinus. Delage carried out a large-scale dissection of an adult male Balaenoptera musculus (now physalus), and described the verumontanum and openings of the vasa deferentia in considerable detail. It seems unlikely that a sinus pocularis could have been missed in material so large. This author emphatically denied its existence. Daudt (1898, p. 295), however, in the same species, described a small sac which he took to represent the uterus masculinus. " The dorsal part of the wall of the neck of the bladder, towards which the folds are seen to converge, is itself somewhat swollen and imme- diately behind this highest point a little pit sinks into the prostate little pit corresponds to the vesicula prostatica" (uterus masculinus). Beauregard and Boulart
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