182 CALIFORNIA ACADEMY OF SCIENCES. 



The ductus is separated from the vesicula by a constric- 

 tion just in front of which the vasa deferentia termi- 

 nate. The ejaculatory duct is divided into a wide, 

 anteriorly and outwardly running, proximal part, and 

 a narrower, longer, and posteriorly running, distal 

 part. The two meet in front at an acute angle. The 

 proximal dilated part is well provided with transverse 

 circular muscles; the distal portion is also provided 

 with muscles but not so prominently as the other. The 

 ductus opens into the penis, but this will be described 

 under the next heading. 



The testes (t) of Goniodes cervinicornis (plate xiii, fig. 

 3) are rather more elongated than those of the last 

 species described, but otherwise very similar. Their 

 larger ends are approximated, and connected by a com- 

 missure narrower and longer than in Eurymetopus. 

 The vasa deferentia (vd) are simple tubes passing from 

 the commissure backwards and then forwards to the sem- 

 inal vesicle {sv). They enter the latter, however, far 

 up, almost at the midlateral points. In this form the 

 vesicle is completely divided to its base into a right and 

 a left lobe. Each lobe is elongated, tapering in front 

 and behind. It is enlarged m its anterior half, and 

 joined a little below its middle point by the vas defer- 

 ens of the same side. The two lobes are connected 

 with the upper end of the ductus ejaculatorius, whose 

 lumen is formed by the union of the cavities of the 

 seminal vesicle. A short, backward-running, proximal 

 part of the ductus is comparatively very narrow. It 

 soon, however, enters on the riglit a greatl}'^ enlarged 

 division of the duct, which extends anteriorly and to the 

 right of the vesicula. It is longer than the latter, wide 

 through the middle, and narrowed at each end. Ante- 

 riorly it gradually contracts into the comparatively 



