192 



DISCOVERY REPORTS 



PR. J. 



CART. I. 



COMM. 



'CART. 2. 



LU PEN. 



GL.EP. 



PR. 2. 



PR.C. 



PR. EXT. 



M. A P. 



SEM. GR. 



Fig. 15. Limacina bulimoides. The penial sac containing the coiled prostate gland illustrated as a stereogram by the opening 

 of the sac in an obliquely longitudinal plane. The prostate is represented as having been cut transversely at three points, 

 PR.i, which ends bluntly in the direction of the observer, and PR.z which becomes continuous above the plane of the 

 section with PR-2, forming the terminal part of the prostate lying at the base of the intromittent portion of the penis. The 

 arrows suggest the course followed by the sperm from the seminal groove, through the interstices between the prostate and 

 the wall of the penial sac, to the base of the intromittent portion. The inset diagram shows the shape of the intact prostate. 



'CART. 1 ', vacuolated connective tissue, forming cartilage-like support of the intromittent portion of the penis; 'CART.z', 

 'cartilaginous' connective tissue of the wall of the penial sac; COMM., communication between the grooves of the penial 

 sac and the base of the intromittent portion; GL.EP., glandular epithelium forming the general lining of the penial sac; 

 LU.PEN., lumen of the intromittent portion of the penis; LU.PROS., lumen of the prostate; M.AP., male genital aperture 

 at anterior end of penial sac; PR.C, prostate as indicated by dotted lines through wall of penial sac; PR.i, PR.2, PR-2, 

 prostate gland; PR. EXT., investment of prostatic epithelium external to the tubular prostate gland; SEM.GR., ciliated 

 seminal groove, running from common genital aperture to male opening; SEP., septum. 



