26 NATICA. 



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



Shell depressed globose, resembling a Turbo ; unibiliciis large, 

 with flattened walls forming an angle with the base of tlie 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. LiMPiDA, E. A. Smith. Tl. (J, fig. 24. 



Rather thin, semitransparcnt, whitish, glossy, opaque white at 

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



Length, 8 mill. Torres Sh-aits, Australia. 



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

 tainly possesses no characters to entitle it to description as a 

 new species. 



N. Antoni, Phil. PI, 6, fig. 25. 



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

 spiral series of brown dots, whitish towards the ])ase ; umbilicus 

 entirely filled with callus. Ticngth, 14 mill. 



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



E. Africa (Smith). 

 Mr. Smith remarks that a 3'oung specimen had a pale band 

 between the two series of dots — which become obsolete in the 

 adult. 



N. CoLLiEi, Recluz. PI. 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, Jajmn. 



N. conciniia^ Dunker (figs. 30, 31) and N. hicincta, Schrenck 

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



N. RUBROMACULATA, Smith. PI. 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, H mill. 



Whydah, W. Africa, 



