156 AMPKLITA. 



bound to the penis from its base to its apex ; its free portion short. 

 Duct of spermatheca long. Albumen gland large, the ovisperm duct 

 imbedded in it nearly its whole length (pi. 51, figs. 1-3, 6, A. xystera. 

 See also pi. 42, fig. 40, A. loucoubeensis). 



Embryonal whorls about 2, indistinctly marked off from the after- 

 growth ; eggs unknown, but apparently one-fifth to one-seventh the 

 diameter of the adult shell. 



Distribution, Madagascar. The general aspect of the shells is 

 that of ground snails, but the dentition is more like that of arboreal 

 forms. The prominent features of this genus, apart from its discoi- 

 dal and peculiar shell, are (1) that all of the teeth of the radula 

 have single, simple rounded cusps, even the outermost marginals ; 

 (2) the ribless jaw; (3) the vas deferens is bound to the penis from 

 apex to base of the latter, and the lower course of the ovi-sperm duct 

 is bound to the albumen gland nearly the entire length of that 

 gland. 



The genitalia of A. loucoubeensis have been figured rudely by 

 Brancsik (Jahresheft der naturwissenschaftlichen Vereines des 

 Trencsener Comitates, xiv-xv Jahrgang, p. 209, pi. 6, f. 3, 1893). 

 The anatomy of A. xystera and dentition of A. sepulchralis has been 

 examined by myself. The species are numerous, and some of them 

 at least are excessively variable, giving rise to an extensive syn- 

 onymy. Most of those described without figures by Mabille may 

 prove synonyms or varietal forms of the well-known species. 



Group of A. sepulchralis. 



A. sepulchralis Fer., vi, 18, 301. A. subsepulchralis Crse., vi, 22. 



labrella Lam. /. obscura C. & F., vi, 302. 



f. sganziniana C. & F., vi, 301. /. minor C. & F., vi, 302. 



/. prceclara C. & F., vi, 300. sepulchralis Rv., f. 147 b. 



f. olivacea Pils., vi, 300. /. nigropurpureaC. &F.,vi,302 



f. lethifera C. & F., vi, 300. A. hova Angas, vi, 24. 



/. funebris v. Mart., vi, 19. madera Mab., vi, 50. 



v. funebris Morel., vi, 301. polydora Mab., vi, 50. 



v. eurychila C. & F., vi, 301. A. stragulum C. & F., vi, 23, 302. 



cadaverosus Pils., vi, 19. A. lamarei Mke., vi, 25. 



/. pallidior C. & F., vi, 301. v. sakalava Ang., vi, 26. 



/. excoriata Mart., vi, 22. v. catarella Mab., vi, 49. 



A. watersi Angas, vi, 26. 



