NEW MAI.LOl'IIAGA. 185 



over the base of (lie ^laiifl, the latter l^eing situated 

 within the eells us a Ihnver in itsealyx. Kramer further 

 describes the penis and its muscles, and also the origin 

 of the sperm and formatinn of the s[)ermatoi)h(jres. 



Transverse sections through the testes of Menopoii 

 titan show that each is surrounded by a structureless 

 outer tunica. Within this is an epithelium of high 

 narrow cells projecting irregularly with ragged edges 

 into the lumen of the organ. They are all more or less 

 curved and together present somewhat the appearance 

 of an iris diaphragm (plate xiii, hg. 1). An intima is 

 apparently absent. The lumen of the testes is not very 

 large and is filled, in [)repared specimens, with a granu- 

 lar substance which is probably a coagulated fluid. 

 The vasa deferentia have an outer tunica resembling 

 that of the testes, within this a single-layered cellular 

 epithelium. The cells are much smaller and relatively 

 a great deal shorter than those of the testes (jdate xiii, 

 fig. 2). The lumen is small and lined by a thin 

 structureless intima covering the inner ends of the 

 epithelium cells. The seminal vesicle is composed of the 

 same elements as the vasa deferentia. The epithelium 

 cells are columnar Ijut comparatively short (plate xiii, 

 figs, 5 and 0). The lumen on the other hand is very large 

 and filled with an apparently coagulated (in mounte*! 

 specimens) non-cellular substance. The organ in sec- 

 tions is clearlv seen to be a doulde structure, for the two 

 halves are almost entirely se[)aratc. The two cavities 

 communicate only through tlic upper cud of the ejac- 

 ulatory duct. The main connection between the two 

 lobes is bv an annarentlv outer laver of the tunica, 

 which in the groove between the two sides passes 

 across from one to the other, and an inner layer con- 

 tinuing around its respective lobe. In some places, 



