124 PTEROCEBA. 



Section I. PTEROCERA (sertsu stricto). 



Subsection I. Heptadactylus, Klein. 

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



Angular fasciole or revolving rib carinated 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, 0-8 inches. 



Indian Ocean, Zanzibar, Philippines, New Guinea, 



Society Islands, etc. 

 P. AURANTIA, Lam. PL 9, fig. 5. 



Angular fa^ciole carinated on spire, and on the last whorl armed 

 with two enlarged tubercles; inner lip with the callus somewhat 

 restricted, folded near the apeiture; 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. 



Philippines, Mauritius, etc. 



P. crocata, 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 tuberculaled 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 lurid. Length, 10-15 inches. 

 Red Sea, Indian Ocean , Mauritius, Japan, 



Philippines, Australia, Society Islands. 



The synonymy includes P. truncata, Lam., Pyrula Bengalina, 

 Grat. (juvenile), P. Sebas, Yal., and P. Soiverbyi, 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. 



