26 NATICA. 



N. FORATA, Reeve. PL 6, fig. 22. 



Shell depressed globose, resembling a Turbo ; umbilicus large, 

 with flattened walls forming an angle with the base of the shell, 

 and with a central thread-like entering-ridge ; aperture semicir- 

 cular, the inner lip straight and mostly detached, bounding the 

 umbilicus ; yellowish white, reticulated and spotted in revolving 

 series with orange-brown. Length, 15 mill. 



Cape of Good Hope. 

 N. LTMPIDA, E. A. Smith. PL 6, fig. 24. 



Rather thin, semitransparent, whitish, gloss3 r , opaque white at 

 the suture ; umbilicus rather narrow, without any internal ridge. 



Length, 8 mill. Torres Straits, Australia. 



No operculnm obtained. Is probably a young shell, and cer- 

 tainly possesses no characters to entitle it to description as a 

 new species. 



N. ANTONI, Phil. PL 6, fig. 25. 



Smooth, plicatulate at the suture ; olivaceous brown, with two 

 spiral series of brown dots, whitish towards the base ; umbilicus 

 entirely filled with callus. Length, 14 mill. 



Loo Choo Islands (Phil.); Mouth of Macusi Riv., 



E.Africa (Smith). 



Mr. Smith remarks that a young specimen had a pale band 

 between the two series of dots which become obsolete in the 

 adult. 



N. COLLIEI, Recluz. PL 7, figs. 34, 30-33. 



Obsoletely plicate at the suture ; yellowish, with oblique, 

 squarish chestnut markings in four spiral series, the two middle 

 series sometimes confluent ; umbilicus with a central rounded 

 entering callus. Length, 19 mill. Australia, Japan. 



N. concinna, Dunker (figs. 30, 31) and N. bicincta, Schrenck 

 (figs. 32, 33) are only color-varieties of this species. 



N. RUBROMACULATA, Smith. PL 7, fig. 35. 



With a band of chestnut-colored maculations above, and 

 another near the base, the spots connected by longitudinal 

 flexuous lines ; margin of aperture maculate within ; umbilicus 

 narrow, with entering callus. Length, 17 mill. 



Whydali, W. Africa. 



