28 NERITA. 



N. GROSSA, Linn. PI. 5, fig. 85. 



With 10-12 strong, spiral ridges and rather wider deeply excava- 

 ted sulci, frequently developing a central, much smaller riblet, 

 white, subradiately maculated with dark grey, varying to blackish ; 

 lip scarcely crenulated, very thick, internally bearing two strong 

 teeth above and usually one beloAV, with an intermediate series of 

 numerous fine denticles, columellar teeth strong, o or 4, the area 

 covered with wrinkles. Diam. 25-33 mill. 



Indian. Ocean, PhUipj}ine.i, N. E. Australia. 



N. Ascensionis, Lam, is a synonym. 



N. UNDATA, Linn. PI. 5, figs. 86-95; PL 6, figs. 96-3; PL 7, fig. 



30. 



With 30-40, rounded, small spiral riblets and narrower shallow 

 interspaces, yellowish, light brown or greyish with darker, olivaceous 

 grey or black maculations, often arranged in radiating, undulating 

 stripes, sometimes broad so as almost to cover the shell, aperture 

 often stained with yellow, median teeth of outer lip very numerous, 

 small, columellar area strongly rugose. Diam. 30-42 mill. 



East Indies, Philippines, etc. 



The above may be regarded as the typical system of coloration 

 in a species varying much in this respect. It has, under different 

 aspects received a number of names, several of which I retain as 

 varietal, not so much because of intrinsic value as for mere con- 

 venience, these several forms having been heretofore recognized as 

 species. With the type may be included N. Papnuina, Recluz, N. 

 LeGuillouana, Recluz (fig. 87), N. marmorata, Hombr. et Jacq., 

 N. Savieana, Recluz, (fig. 88), N. crassa, Gould (fig. >*9), N. undulata, 

 Gmel. and N. Novce-Guinece, Lesson (fig. 90), the two last juveniles. 



Var. MicRONEsrCA, Martens. 



Blackish olivaceous, with two spiral black bands. 



Var. STRIATA, Burrow. Figs. 91-94, 100, 1. 



Costulations small, close, somewhat unequal, greyish, yellowish, 

 or light brownish, usually spotted, undately strigate or trifasciate 

 with dark grey, olivaceous or black, aperture tinged with yellow. 



The synonyms are N. chrysostoma, Recluz (in part, fig. 91), N. 

 undata, Gould, Var. icterina, Marts, including N. aurantia, Recluz, 

 (fig. 92), iV. Tongaensis, Hombr. et Jacq. N. grisea. Reeve (fig. 93), 



