382 The MoUuscan Family Planorbidae 



PLATE 73 



* Indoplanorbis exustus (Deshayes) 



Genitalia cojiied from Larambergiie, 1939b, p. 288 



1. General view of genitalia (in French works the figures of both the animal and the 



shell are in reverse as compared with the position of American figures). 



2. Penial complex (appareil copulateur) with vergic sac cut open to show length and 



nature of verge. 



3. Transverse section of vas deferens (canal deferent). 



Explanation of symbols used on the plates: Al, albumen gland; Bf, 

 buccal sac; C, junction of preputium with vergic sac (col); C '^ , ovi- 

 sperm duct (canal hermaphrodite) ; Cd, vas deferens (canal deferent) ; 

 G, preputium (gaine) ; G ^, ovotestis (glande hermaphrodite); Gu, 

 nidamental gland (glande uterines) ; Od, oviduct; P, pilasters (piliers 

 musculaires) ; Pc, spermatheca (poche copulatrice) ; Pe, verge (tube 

 penial); Pp, vergic sac (poche du penis); Pr, prostate; R, retractor 

 muscle (muscle fetracteur) ; compare the insertions of this figure with 

 the figures on plate 22 of this work; Sp, sperm duct (spermiducte) ; 

 Ut, uterus; Va, vagina. 



Vertical line indicates measurements in millimeters; horizontal line 

 in microns. 



