ANIMAL BIOLOGY. 



[Part II. 



The essential organ is lodged in the right lobe of the diges- 

 tive gland in the apex of the shell (Fig. 87, h. gl), from which 

 it has not been extricated in the dissection from which the 

 diagram is taken. It is known as the hermaphrodite gland, 



.a. 



g.ap. 



FIG. 87. SNAIL : ORGANS OF GENERATION. 



al. gl Albumen gland, d. s. Dart Sac. fl. Flagellum. g. ap. Genital Aperture. 

 h. d. Hermaphrodite duct. h. gl. Hermaphrodite gland imbedded in terminal 

 lobe of digestive gland, m. gl. Muciparous gland, ov.d. Oviduct, pr. 

 Prostate, p. s. Penis sac. r. p. Retractor muscle of penis sac. sp. Sper- 

 matheca. vl>. Vestibule, v.d. Vas deferens. 



or ovotestis. Within the minute acini, of which it is an aggre- 

 gation, both ova and spermatozoa are developed. And if an 

 ovotestis be teased with needles, and examined under the micro- 

 scope, developing or ripe ova, and sperm cells, spermatoblasts 

 attached to a blastophore, blastophores with bundles of almost 

 fully developed spermatozoa, or separated male elements may be 

 seen. 



