178 



Columella callous, transverse, rather flat; margin acute, forming an angle at 

 the lower base of the right lip. Operculum corneous. 



H. neritella, 

 ' striata, 

 ' fasciata, 

 ' viridis, 

 ' pulchella, 



II. substriata, 



' Brazil iensis, 

 ' costata, 

 ' aurantia, 

 ' rhodostoma, 



H. major, 

 ' submarginata, 

 ' unifasciata, 

 ' Brownii, 

 ' depressa, 



II. aureola, 

 ' orbiculata, 

 ' scitula, 

 ' Tankervillii. 



Pupa. Shell cylindrical, generally 

 the lower part rounded and subangular 

 outwards, disunited at the upper part 

 always affixed. 



thick; aperture irregular, demioval, 

 ; the margins nearly equal, reflected 

 by an interposed columella lamina, 



Clausilia. Shell mostly fusiform, slender, the summit rather obtuse; 

 aperture irregular, rounded oval; the margins united throughout, free, re- 

 flected outwards. 



C. torticollis, 

 ' truncatula, 

 ' retusa, 

 ' costulata, 



C. corrugata, 

 ' inflata, 

 ' teres, 

 1 denticulata, 



C. collaris, 

 ' papillaris, 

 ' plicatula, 

 ' rugosa, 



C. gracilis, 

 ' chrysalis, 

 ' Mediterranea. 



Bulimus. Shell oval, oblong, or turreted; aperture entire, longitudinal; 

 the margins very unequal, disunited at the upper part. Columella straight, 

 smooth, the base entire, not channelled. 



B. ovatus, 



hsemastomus, 



gallina, 



sultana, 



zigzag, 



undatus, 



Richii, 



inversus, 



citrinus, 



sultanus, 



Pythogaster, 



ovoideus, 



interruptus, 



B. Peruvianus, 



' Favannii, 



' Kambeul, 



' c ale are us, 



' decollatus, 



' Lyonetianus, 



' inflatus, 



' radiatus, 



' fragilis, 



' Gaudalupinsis, 



' Mexicanus, 



' multifasciatus, 



' Bengalensis, 



B. Caribseorum, 



' octonus, 



' terebraster, 



' articulatus, 



' acutus, 



' ventricosus, 



' montanus, 



' hordaceus, 



' lubricus, 



' iostoma, 



' goniostoma, 



' odontostoma, 



B. formosus, 

 ' Listeri, 

 ' Kingii, 

 ' Dufresnii, 

 ' pulcher, 

 ' Maugeri, 

 ' lsevis, 

 ' auris leporis, 

 ' papyraceus, 

 ' scobinatus, 

 ' vexillum, 

 ' planidens. 



