FERTILIZATION IN LERN^EOPODA EDWARDSII OLSSOX. 117 



posteriorly to a slit-like opening located in the extreme lower 

 margin of the male's body. This opening is the ejaculatory pore 

 (Figs. 3-6, e.p.), through which the spermatophore is extruded. 



Each spermatophore (Figs. 1-6, sp.) originates in the third 

 branch of the vas deferens. It is pear-shaped in form, and in the 

 living organism is of a pale yellowish color. In Figs. 5-7 the 

 structure can best be studied. The spermatogonial pouch, 

 filled with spermatozoa (sz.), is enclosed by an outer wall of 

 chitin (cli.). Immediately behind this there is a thin layer of 

 cement-like substance (c.), that stains intensely black in Heiden- 

 hain's iron-alum hsematoxylin. In the center of the spermato- 

 phore is a spherical pouch rilled with a similar cement (c.) as is 

 evident from the similarity of its staining reaction. This cement 

 substance of the spermatophore appears to be continuous with 

 the small sphere of cement found in the loop-like enlargement of 

 the vas deferens (see Fig. 3, v.d. j). 



When the spermatozoa are mature, they are discharged into the 

 first branch of the vas deferens. From here they pass into the 

 second lobe, and finally, they migrate into the canal situated in 

 the center of the third part of the vas deferens. This is shown in 

 Fig. 5, where the canal (can.} conducts the spermatozoa into 

 the spermatophoral pouch, located between the central sphere of 

 cement and the outer cement wall. Here the sperm (Figs. 6-7, 

 5Z.) are stored until copulation occurs. 



THE FEMALE REPRODUCTIVE ORGANS. 



The mature female is much bigger than the male, being about 

 three times as long as the latter. Fig. i shows this size difference. 

 The sex organs of the female lie dorso-laterally within the ab- 

 domen, between the intestine and the body wall. The ovaries 

 (Figs. I and 9, ov.}, are paired in character, and each gives rise 

 to a slender oviduct (Figs. I and 9, od.), which makes its way 

 around the intestine to the posterior portion of the body, where 

 it opens to the exterior. Both oviducts unite slightly above their 

 terminations into a broad pouch that later becomes the sperma- 

 theca and its accessories (Figs. 9 and n, s.). From this pouch, 

 two slender tubes are developed that open posteriorly through 

 the genital pores (Figs. I and 8, g.p.). Also, within each oviduct, 



