124 PTEROCEBA. 



Section I. PTEROCERA (sensu stricto). 



Subsection I. Heptadactylus, Klein. 

 P. LAMBIS, Linn. .PL 8, figs. 1-3. 



Angular fasciole or revolving rib carinatecl on spire, on the 

 body-whorl provided with two enlarged, compressed tubercles ; 

 inner lip with the callus spreading; outer lip with the margin 

 (normally) somewhat reflected, with the digitations bending out- 

 ward and rather small, and with the antesinual lobe undulated ; 

 lips and aperture whitish or yellowish brown, becoming more or 

 less sanguineous within. Length, 6-8 inches. 



Indian Ocean, Zanzibar, Philippines, New Guinea, 



Society Islands, etc. 

 P. ATJRAN T TIA, Lam. PL 9, fig. 5. 



Angular fasciole carinated on spire, and on the last whorl armed 

 with two enlarged tubercles; inner lip with the callus somewhat 

 restricted, folded near the aperture ; outer lip with its margin 

 somewhat inflected, the digitations successively more recurved, 

 and the antesinual lobe tridentate ; lips more or less orange or 

 saffron-colored. Length, 5-6 inches. 



Philippine*, Mauritius, etc. 



P.crocala, Link, has priority, but it is unnecessary to displace 

 a well-established name in favor of a recently resurrected one, 

 published very obscurely. 



P. BRYONIA, Gmelin. PL 8, fig. 4 ; PL 9, fig. 8. 



Angle coronated or tuberculaf ed on spire, unarmed on the last 

 whorl ; inner lip with diffused callus, outer lip with erect margin, 

 with six moderate digitations, and with the antesinual lobe little 

 undulated ; lips whitish or luri'd. Length, 10-15 inches. 

 Red Sea, Indian Ocean , Mauritius, Japan, 



Philippines, Australia, Society Islands. 



The synonymy includes P. truncata, Lam., Pi/rula Bengalina, 

 Grat. (juvenile), P. Sebae, Yal., and P. Sowerbyi, Morch. Morch 

 has distinguished the two latter as species, but they do. not 

 present any claim to even varietal rank ; not only is the species 

 very variable within its usually recognized limits, but certain 

 specimens before me indicate a transition to P. lambis. 



