CEBIT! i . 117 



pletrlv tllr M>|M cl of a M rl;ilii;i II that it i- Very probable Adaln 



I ;i- to hi- oprrculum really heloiigin;: to it. 



Section GOUBJTS \. P.ayle. L8fl I. 



No internal plications or tubercle- ; outer Hirface smooth. 

 Section I )[ TI;I:II -. Piette, 1*7 \. 



Turreted, With longitudinal rows <f tubrrc]<- ; outer lip thick- 

 ened, prolonged Itclou so MS to clox- the canal \\liich is short, 

 inner lip >pread nt, calloii>. I*. BQSTELLABIA, \\\\v. .Jura 



Snl^-enns TKI.IX OI-ITM, Montfort, 1810. 



Shell conical or trochoidal, of niinnTMiis flat \vlmrls, the aperture 

 Bubquadrangular, short, not chanuclivl behind; lip thin, sinuous, 

 prolonged at the base ; culuinella interiorly jilicate, ])lication visible- 

 near the suture. 



/'. ti-frxctiiihtiii is so abundant near Calcutta as to be used for 

 burnini: into lime; irreat heaps of it bein^ first exposed to the sun, 

 to kill the animals. In Borneo it is an article of food. 



Subireiins VITA IMA, d'Archiac, 1S">4. 



Turreted, spirally striated, with a row of tubercles next below 

 the suture; canal very short, recurved, inner lip callously thick- 

 ened, the callosity prolonged behind, where the aperture is chan- 

 neled; outer lip strongly sinuated posteriorly. 



P. VERNEUILI, cl'Arch. Xummulite, India. 



Submenus PIRENELLA, Gray, 1847. 



Shell turriculated, granose, with irregular ribs and vari 

 aperture rounded, terminating in a short anterior canal ; inner lip 

 simple, outer lip thin, sinuous. I*. MAMILLATTS, Phil. 



Subgenus CKHITHIDEA, Swainson, 1840. 



Turriculated, longitudinally ribbed; whorls numerous, apex 

 more or less truncated ; aperture rounded, slightly transversely slit, 

 anteriorly; outer lip expanded, thickened, broadly rounded below 

 and usually produced into a beak, cri>sing the sinus to the left. 

 Eye pedicels long and thick, connate with the tentacles nearly to 

 their tips. 



They are so commonly out of the water as to have been taken tor 

 land shells. P. DEOOLLATU8, Linn. 



Section APHANISTTLUS, Fischer, 1884. 



Shell decollated, thin, la>t whorl carinated : lip not dilated, nor 



