REPRODUCTIVE ORGANS 



337 



■^ fjj -sj.s 



contains the ripe ova, arranged in a single row, each en- 

 closed in a vitelline 

 membrane and con- 

 taining a large nucleus 

 and nucleolus and a 

 number of granules of 

 food-yolk (p. 195). The 

 eggs are discharged 

 into the coelome and 

 are received into the 

 female gonoducts or 

 oviducts (Fig. 79 o.d., 

 and Fig. 82) — two 

 short tubes, each with 

 a wide ciliated mouth 

 placed opposite the 

 corresponding ovary. 

 The oviduct perforates 

 the next following sep- 

 tum {i.e. that between 

 segments thirteen and 

 fourteen) to open by 

 a minute aperture on 

 the fourteenth seg- 

 ment, near the inner 

 double row of setje. 

 Connected with the 

 mouth of each oviduct 

 is a small egg-sac (Fig. 

 79, r. o, Fig. 82, e. s), 

 developed as an out- 

 growth from the same septum and extending back into 

 the cavity of segment fourteen. 



Pract. Zool. Z 



Fig. S2. J.)iagraiTiniatic longitudinal section o 

 part of a Litmbriats, showing segments 

 9 — 15 and the contained generative organs 

 of one side :X3. In the body-wall the cuticle 

 is indicated by a clear space, the circular 

 muscles by irregular dots, the longitudinal 

 muscles by dotted longitudinal lines, and the 

 peritonea! membrane by a thin line. 

 c. s, egg-sac ; i?.' ovary ; f:p. aperture of anterior 

 spermotheca — both spermotheca; are indicated 

 by dotted lines ; sp. s. posterior sperm-sac, the 

 anterior and middle sacs are not lettered ; 

 ss. sperm-sac; /. anterior spermary — the 

 posterior is not lettered; 9 ■ aperture of ovi- 

 duct ; J . aperture of spermiduct. The ovi- 

 duct, spermiduct, and seminal funnels are 

 indicated by thick lines. (From the Cambridge 

 Natin-al History^ after Hesse.) 



