ORTHALICUS. IxV 



The jaw is composed of 15 plaits, the median ones not reaching 

 he lower margin. The radula (pi. 56, fig. 55, 0. sultana from 

 Maranon, after Binney) has over 108.1.108 teeth. The central and 

 nner three laterals on each side have rather narrow basal-plates, and 

 ong, lanceolate cusps. The rest of the teeth are wide, with broad,, 

 short, rounded cusps, as usual in the subfamily. 



O. sultana Dillw., xii, 188. 0. meobambensis Pfr., xii, 191. 



H. gallina sultana Chemn. O. trullisatus Sh., xii, 191. 

 0. sultana Beck. 

 A. pavonina Spix. 



Subgenus METORTHALICUS Pils. 



The anatomy of 0. atramentarius has been examined by Strebel 

 and Pfeffer. The lower portion of the penis is much swollen ; it 

 bears a large appendix, which is slightly lobed distally (pi. 55, fig. 

 48, 47, section of penis and appendix, f. 49, appendix). The median 

 plaits of the jaw are markedly triangular. The radula (pi. 56, fig. 

 54) has the central tooth, three laterals on one side and four on the 

 other, of the narrow, lanceolate shape which occurs in 0. princeps, 

 0. sultana, Liguus virgineus and magnificus ; the other teeth being 

 of the usual broadly rounded form. 



Group of 0. fraseri. 



O. buckleyi Higg., xii, 193. O. galactostoma Anc., xii, 194. 



O. fraseri Pfr., xii, 193. O. augusti Jouss., xii, 195. 



v. brevispira Pils., xii, 194. 



Group of 0. deburghice. 



O. deburghiae Rve., xii, 196. O. wrzesniowskii Lub., xii, 198. 



gloriosus Pfr. O. maranhonensis Alb., xii, 198. 



v. elongata Mill., xii, 198. 



Group of 0. labeo. 



O. labeo Brod., xii, 199. O. yatesi Pfr., xii, 202. 



O. vicarius Fult., xii, 200. v. sublabeo ' Dohrn ' Anc. 



labeo Rve. v. latevittata Shutt. 



O. shuttleworthi Alb., xii, 201. O. kelletti Rve, xii, 204. 



v. fungairinoi Hid., xii, 204. 

 jatesi Hupe. 



