100 CALIKOICNIA ACADIOMY OV SCIE>'CE.S. 



PLATE XXXVIT. 



rONTODRILUS MICHAELSENI. 



55. A spoimntheca with its diverticulum seeu from interior of the l)ody, when the body-wall is spread out. upth. p. 



spermiithcciil pore. il. diverticulum, up-., iuner sac-like enlaryemeut where the spermatozoa are massed. 



56. A cross-sectiou of the hody-wall throuj^h the spermatheca near its pore. v. I. thin vascular layer or perito- 



neum, l.m. longitudinal muscle.s. /. m. transverse muscles, hy. hypodermis. npz. spermatozoa, int. ii. 

 interstitial nuclei, fu. epithelial nuclei and cells, e. m. circular muscles of the spermatheca. (/;r. diver- 

 ticulum. 



57. A cross-section of the diverticulum of the spermatheca. in. inner nuclei of the epithelium, ints. n. inter- 



stitial nuclei, c. m. circular muscles. ///. vascular layer, gl. c. exterior glandular layer consisting of a 

 double or triple row of cells. 



58. A longitudinal section of the body-wall, somites vii, viii and ix made through the spermathecal pore, spth, p. 



spermathecal pore. .yilh. the lower, enlarged part of the spermatheca, which forms a strongly muscular 

 papilla, dr. the junction with the diverticulum, net. seta. /. »i. longitudiual muscles. /. m. transverse 

 muscles, a. s. anterior septum of somite viii. p. s. posterior septum of somite viii. 



59. One of the testes. 



(iO, A longitudiual section of one of the testes. 



01 . An ovary. 



(j2. Longitudinal section of an ovary. 



63. Longitudiual section of the oviducal funnel. «. septum. 



