2*74 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XIIL 



Ocnerodrilus ( Ilyogenia) taste (Eisen). 



Fig. 135. Spermatheca. This organ is smaller than in the type from EI 

 Taste, Baja California. The specimen described is from Tepic, 

 Mexico. 



Diplocardia (Aleodrilus) Key est (Eisen). 



Fig. 136. One of the spermathecse. 



Diplocardia singularis Ude, caroliniana var. nov. 



Fig- 137- Clitellar and genital somites, ventral view. 



Fig. 138. A common seta. 



Fig. 139. A penial seta; same magnification as in 138. 



Fig. 140. Apex of penial seta. 



Fig. 141, a and b. Two spermathecae from somites VIII and IX. 



Fig. 142. A prostate. 



Diplocardia riparia Smith. 



Fig. 143. A spermatheca, somite IX. 



Fig. 144. The other spermatheca from the same somite. 



Diplocardia Udei Eisen. 



Fig. 145. Anterior somites, ventral view. The ventral parts of somites VIII- 

 X are swollen and furnished with spermathecal sexual setae. 



Fig. 146. Sexual zone in somites XVII-XXI. 



Fig. 147. Somite VIII, longitudinal section of body-wall, showing sperma- 

 theca and its diverticle; gl., glands leading to the spermathecal 

 sexual setse. 



Fig. 148. Spermatheca from IX, with a hidden diverticle. 



Fig. 149. A prostate with muscular duct and bundle of penial setae. 



Fig. 150. Spermathecal sexual seta. 



Fig. 151. Apex of spermathecal sexual seta; side view and front view. 



Fig. 152. Apex of common seta. 



Fig. 153. Apex of penial seta, same magnification as fig. 151. Zeiss Apo. 

 2 mm., Oc. 4. 



Fig. 154. Longitudinal section of body- wall passing through the pore of sex- 

 ual seta and showing the glandular structure combined with it; 

 sex. gl., sexual glands, the ducts of which lead to the pore, and 

 to the chambers opening in the pore; chant, sex.gl., chambers 

 into which open the ducts of the sexual glands; sex. set., sex- 

 ual seta cut off obliquely, just before it enters the pore; dticts. 

 sex. gl., ducts of the glands leading to the pore. 





