ZOOL.— Vol. III.] HEATH— EPIDELLA SQUAMULA. 119 



ducts leading to the prostate reservoirs. All these cells, 

 similar in form, react in essentially the same way when 

 treated with different reagents, and although they undoubt- 

 edly belong to various categories it is impossible to differ- 

 entiate them. A considerable number immediately behind 

 the testes lead to the prostate vesicles, and many others 

 located farther backward appear to pursue the same course. 

 As noted above, the ducts follow different routes until they 

 arrive in the neighborhood of the ovary, but from this point 

 they become closely associated, and pursuing a somewhat 

 wavy course open into the prostate reservoirs. 



The walls of the latter are composed of a felted mass of 

 connective tissue fibers which at many points may be seen 

 to pass off into the surrounding parenchyma. A few 

 muscle fibers without any apparent definite arrangement 

 lie in the substance of this sheath. Ganghon cells are also 

 visible on its outer surface, and the terminal cells of the 

 excretory system are frequently noted in preserved and 

 Hving specimens. Within the vesicle a considerable num- 

 ber of muscle and connective tissue bands extend from the 

 anterior lobe of the reservoir into the posterior, where they 

 radiate and attach to its walls. 



The penis (figs. 11, 13) is a hollow, conical organ 

 lying almost wholly in the genital atrium. It is totally 

 devoid of any chitinous modifications, and is accordingly 

 a comparatively weak structure. The spongy connective 

 tissue of which it is composed is apparently directly con- 

 tinuous with the closely matted fibers forming the walls of 

 the prostate reservoirs. 



The muscles of the penis consist of the outer and inner 

 sets of circular muscles and the longitudinal bands. The 

 first of these is well developed, and occupies a position 

 immediately beneath the limiting membrane. Beneath 

 these He the irregularly disposed longitudinal fibers, which 

 are usually continuous with the somatic muscles or with 

 those imbedded in the walls of the prostate reservoir. On 

 the side of the penis which is traversed by the vas deferens 

 a comparatively few longitudinal fibers extend within the 

 reservoir and become attached to its walls. 



