264 CALIFORNIA ACADEMY OF SCIENCES. [PROC. 3D Ser. 



EXPLANATION OF PLATE VIIL 

 Eudrilus Eugenics (Kin berg). 



Fig. 40. Transverse section of a median calciferous diverticle of the intestine. 

 The section passes through the junction with the intestine. 



Fig. 41. Transverse section of the median diverticle of the intestine. Only 

 a few of the numerous calcic crystals figured. 



Fig. 42. Subintestinal vessel surrounded by lymphatic tissue. The dark 

 dots represent nuclei. Zeiss A A., Comp. Oc. 6. 



Fig. 43. A highly magnified detail of the former. The solid black repre- 

 sents blood. Zeiss, Apo. 2 mm. Comp. Oc. 4. 



Fig. 44. Male apparatus, in longitudinal section. The figure is constructed 

 from a number of sections and is to some degree diagrammatic. 

 The section does not show the free, external parts of the organ; 

 div. pr. , diverticle of the prostate joining the main prostate at the 

 point X; e. sp.d., entrance of sperm-ducts into the main prostate; 

 jn. s. , muscular layers of prostate enclosing both the main pros- 

 tate and its diverticle; p., section of penis. The large central 

 lumen is the duct from the prostate. Below this is seen a T- 

 shaped groove. The Y-gland opens out just opposite this groove 

 at X • The junction of the central canal in the penis and the T- 

 shaped groove is found much nearer the apex of the penis, and 

 is not shown in the figure; co. m. c, copulatory muscular cushion, 

 the inner wall of the lumen. 



Fig. 45. A transverse and sagittal section through the copulatory male pore, 

 showing the ducts. The figure is constructed from three sec- 

 tions. The details are diagrammatic; pr. d., duct from prostate 

 below junction of the diverticle and the main prostate; pr., sec- 

 tion of the prostate above its junction with the diverticle. The 

 dotted lines indicate the outlines of the prostate between the two 

 sections; l.gro., lumen of groove running along the exterior of 

 the penis. This groove connects with the lumen of the penis 

 nearer its apex, which is twisted. The section has passed 

 through an apparent, but not a real opening in the wall. A real 

 opening does not exist; or. y. gl., pore of the Y-gland, opposite 

 the external penial groove. 



Fig. 46. A more highly magnified detail of fig. 44, representing the pore of 

 the Y-gland and the groove of the penis; t. gr., T-shaped groove 

 in the penis, on the side of the papilla; c. c, copulatory cushion 

 following the inner wall of the bursa; bu. c, copulatory bursa; 

 o. bu. c, opening of copulatory bursa. 



Fig. 47. Cross-section of the prostate at the point where the sperm-ducts 

 enter the prostate. 



Fig. 48. A cross-section of the body in somite XVII, passing through the 

 pore of the copulatory bursa; c. b. c, cushion of bursa, strongly 

 muscular; po. b. c, pore of bursa, the latter retracted below the 

 outline of the body; gr., exterior groove in penis, cut through in 

 such a way as to appear a single pocket; d. y. gl., duct of Y-gland, 

 near the pore; or. y. gl., pore of Y-gland, the dots indicate its 

 appearance in succeeding sections. 



