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CALIFORNIA ACADEMY OF SCIENCES. 
PLATE XXXVII. 
PONTODRILUS MICHAELSENT. 
A spermatheca with its diverticulum seen from interior of the body, when the body-wall is spread out. spth. p. 
spermathecal pore, d. diverticulum. spz. inner sac-like enlargement where the spermatozoa are massed. 
A cross-section of the body-wall through the spermatheca near its pore. v. Jl. thin vascular layer or perito- 
neum. /. m. longitudinal muscles. ¢. m. transverse muscles. hy. hypodermis. spz. spermatozoa. int. n. 
interstitial nuclei. en. epithelial nuclei and cells. c. m. cireular muscles of the spermatheca. div. diver- 
ticulum. 
A cross-section of the diverticulum of the spermatheca. im. inner nuclei of the epithelium. inés. x. inter- 
stitial nuclei. c.m. circular muscles. 5]. yascular layer. gl. c. exterior glandular layer consisting of a 
double or triple row of cells. 
A longitudinal section of the body-wall, somites vii, viii and ix made through the spermathecal pore. spih. p. 
spermathecal pore. spth. the lower, enlarged part of the spermatheca, which forms a strongly muscular 
papilla. dv. the junction with the diverticulum.  sef. seta. 7. m. longitudinal muscles. ¢. m. transverse 
muscles. a.s. anterior septum of somite viii. p.s. posterior septum of somite viii. 
One of the testes. 
A longitudinal section of one of the testes. 
An ovary. 
Longitudinal section of an ovary. 
Longitudinal section of the oviducal funnel. s. septum. 
