Plate XVII. 



Figs. 1 — 5. Rotula anceps, Gould, see p. 233 et seq. 



1 . General anatomy, 2, diagrammatic view of the various lobes 

 of the mantle, enlarged ; 3, genital organs ; 4, jaw ; 5, teeth, all en- 

 larged (see p. 236). 



Tigs. 6 — 14. Macrochlamys [Durgella] honestaj Gould, p. 248 

 et seq. 



6, normal form ; 7, Pegu variety ; 8, abnormal variety from 

 Moulmein, (comp. p. 248) ; 9, variety from near Moulmein ; 10, jaw ; 

 11, peculiar solid, horny threads from the genital organs ; 12, solid 

 particles out of the bag marked x in fig. 13, which is a peculiar 

 appendage of the genital organs; 14, various teeth; all objects 

 represented in figures 10 — 14 are greatly enlarged. 



f, foot ; fg, foot gland ; a, anus ; r, rectum ; ag, amatorial gland j at, albu- 

 minous gland accompanying the rectum j li, liver ; i, intestines ; st, stomach ; 

 sg, salivary glands; h, heart; Tc, kidney; pg, pigment gland; I, lungs; 

 oe, oral parts ; Isl, left shell lobe of mantle ; Is I', lower end of the same ; rsl, right 

 shell lobe ; rsl', lower end of the same ; rdl, right dorsal lobe ; ldl } left dorsal 

 lobe ; p, penis; p', enlarged portion of the same; cd, calciferous gland,; 

 ft, fiagellum ; vd, vas deferens ; fa, sessile gland of the oviduct ; rs, recepta- 

 culum seminis ; ut, uterus ; pr, prostata ; hd, hermaphrodite duct ; hg, herma- 

 phrodite gland ; dig, albuminous gland ; m, retractile muscle ; ho, hermaphro- 

 dite opening. 



