286 CALIFORNIA ACADEMY OF SCIENCES. 



Fig. 25. (). Bosce. A part of the muscular portion of the prostate gland 

 showing glandular cells imbedded in and between the spiral mus- 

 cles. 

 (/I. glands. 

 /. inner lumen of the duct, the focus being set on the surface of 



the di;ct. 

 ms. spiral muscles. 

 Fig. 26. O. Rotut A portion of the upper surface of the glandular part of 

 the prostate gland, showing the ends of the tubular cells. 



Plate VII. 



Fig. 27. 0. BeddardL A sperraatheca from somite ix. 



d. rudimentary diverticula; a portion of the tubular cells are shown. 



They are more regular and prominent than in any other species. 

 b. IV. body wall. 

 Fig. 28. 0. Beddnrdl. The other side of the same spermatheca. 

 d. rudimentary diverticula. 

 niK. muscular lower part of the organ. 

 Fig. 29. 0. Beddardi. Section of the wall of one of the spermathecal 



diverticula shown in the last figure. 

 .s;>z. spermatozoa. 

 Fig. 30. O. Beddardi, a semi-schematic view of the lateral vessels in one 



of the posterior somites. 

 d. V. dorsal longitudinal pulsating vessel. 

 V. V. ventral lougitiidinal non-pulsating vessel. 

 /. d. V. lateral dorsal vessel, two of which are found in each 



somite. 

 I. V. V. lateral ventral vessel, two of which are found in each 



somite. Both of these two vessels cling princijjally to the 



parietes of the somite. 

 <j. V. gastric vessel, one pair of which are found in each somite, 



they spread on the sacculated intestine, feeding the gastric sys- 

 tem. 

 V. gl. ventral nerve ganglion, 

 .s. septa, 

 s-. i. sacculated intestine. The upper and lower line indicate the 



parietes of the body somites. 

 Fig. 31. O. limicola. A semi-schematic view of the pharynx, resophagus, 



septal glands, dorsal vessel and hearts, showing the relative size 



of the septal glands and their lobes. Also the connecting vessel 



in somite ix. 

 phx. pharynx. 

 ,s/. gl. salivary glands. 



