OVEKTON : ANATOMY OF ARIOPHANTA JL LIANA, GRAY, 



P'ig. 2. — Generative Oryaiis, with the penis, etc., turned on one side. 

 Lctteiinii us in Fiy. i. 



Exttrnally the generative orifice opens into the vestibule into whicli the 

 penis opens posteriorly and dorsally, the dart-sac anteriorly and ventrally, 

 and the vagina in the middle. 



The vagina is a moderately long tube-like duct, having its internal wall 

 thrown into four longitudinal plications, which are continued into the free- 

 oviduct. At the opening of the receptaculum seminis they form a series of 

 serpentine folds, beyond which they run in a straight series for a short dis- 

 tance, and then in the bulbous portion of the free oviduct they become more 

 numerous and rise up in a very prominent manner. The receptaculum 

 seminis is a heart-shaped sac, and sessile. The penis is a large muscular 

 organ with a thick-walled muscular diverticulum, at the apex of which is the 

 retractor muscle At the junction of the penis and diverticulum the kalk-sac 

 is given off. This sac is a large muscular body, with smooth internal walls, 

 and in one specimen contained a hard calcareous body measuring 2 by .7 

 millim., which in all probability was a spermatophore incompletely formed. 

 From the anterior end of this sac the epiphallus is given off, which leads to 

 the narrow vas deferens. The dart-sac is a large muscular tube, and contains 

 a small fleshy dart, which exhibits a concentric ribbing. 



Judging from the generative organs this species seems to be nearer to 

 Euplrda, Semper, than to Arioi^hanfa, s.s. 



