58 SIGARETUS. 



the species. S. undulatus, Lischke (figs. 70-72) appears to me 

 to be very similar. 



S. DELESSERTI, Recluz. PI. 25, figs. 73, 74. 



Plano-convex, thin, pellucid, yellowish chestnut, somewhat 

 zoned, interior chestnut-colored. Diam., 32 mill. 



Philippines. 



Dr. Weinkauff refers to this species a shell with a well-defined 

 chestnut-band (fig. 74); bethinks it scarcely distinguishable from 

 S. laevigatus, Lam. 



S. PLANULATUS, Recluz. PI. 25, figs. 75-77. 



Much flattened on the dorsal side, white, under a very thin 

 yellowish epidermis, smooth, or with obsolete or very slight 

 spiral striae. Diam., 1-25-1-5 inches. 



Zanzibar, Philippines, Australia. 



Distinguished by its smooth flattened surface. It is S. planus, 

 Phil., S. Gualterianus, Recluz, S. lacteus, Recluz (fig. 77), S. 

 Indica, Gray. 



Section EUNATICINA, Fischer, 1885. 



S. PAPILLA, Gmelin. PI. 25, figs. 78, 79, 87, 88. 



Whitish, under a yellowish epidermis, moderately umbilicated, 

 spirally engraved. Length, 33 mill. 



Tranquebar, Moluccas, Japan, Philippines. 



It is S. costulatus, Quoy and Gaimard, S. acuminatus, Ad. and 

 Reeve. The following appear to me to be only varieties : S. 

 coarctatus, Reeve (fig. 79), S. nitidus, Reeve (fig. 87), S. acumin- 

 atus, Ads. and Reeve (fig. 88). 



S. TUMESCENS, Reeve. PL 25, fig. 82. 



Rather thin, ventricose, body-whorl not slopingly flattened. 

 Length, 1 inch. 



Hab. unknown. 

 Probably only a variety of the preceding species. 



S. OBLONGUS, Reeve. PL 25, fig. 83. 



Resembles S. papilla in form, but the sculpture instead of 

 incised linear grooves, consists of numerous raised threads. 



Length, 30 mill. 



Hab. unknown. 



Yery doubtfully distinct from S. papilla. 



