N A T I C A. 



Plate Vllf. 



Species 28. (Mus. Cumiug.) 



Natica candidissima. Nat. testa, sidobtecte umhiUcaid, 

 glohom, poiiderosd, spird mimttd, vix elevatd, apice 

 distindd, aufractibus decUvi-convexis, deinde roimi- 

 datis, miiiutissinw decussatim striatis, aperturd parvd, 

 obliqiid, semibmari, colxmeUd dense ca/losd ; nifetite- 

 albd. 



The very white Natica. Shell witli a nearly covered 

 umbilicus, globose, ponderous, spire very small, 

 scarcely raised, distinct at the apex, whorls slant- 

 ingly convex, then rounded, very minutely decus- 

 sately striated, aperture small, oblif[ue, semilunar ; 

 columella densely callous, shell white. 



Le Guillou, Revue Zool. Soc. Cuvierienne, IS 12, p. 10.5. 



llab. Moluccas. 



Of a peculiarly short globose form, the spire being only 



faintly indicated, although distinctly developed at the apex. 



Species 29. (Mus. Cuming.) 

 Natica mamillaris. Nat. testa suhamjmle profiinde 

 vmbilicatd, conoideo-ovatd, crassd, spird siibclaeatd, 

 anfractibiis superm depresso-declivibus, deinde con- 

 vexis, minutissime decussatim .•striatis, aperturd semi- 

 lunari, parviusculd, colmnelld callosilate imdiocri ; 

 fulvo-rubescente, basi alba. 

 The mamillary Natica. Shell rather narrowly deeply 

 umbilicated, conoidly ovate, thick, spire somewhat 

 raised, whorls depressly slanting at the upper part, 

 then convex, very minutely decussately striated, aper- 

 ture semilunar, rather small, columella with a mode- 

 rate callosity ; fulvous-red, white at the base. 

 Lamarck, Anim. sans vert. (Deshayes' edit.), vol. viii. j). 



638. 

 Hab. West Indies. 



M. Deshayes has shown, in an elaborate note on this 

 species, that the Linnrean Natica mamiUaris must refer 

 to a freshwater shell, probably a Lyinnea. The shell re- 

 presented in the accompanying Plate, which Lamarck took 

 for his type, is well figured by Chemnitz. 



uiiihilicntd, ublonijo-ovatd, subpyrijornii, inmidd, spird 

 parvd, anfractibus obligtie rude striatis, striis minu- 

 tissimis spiralibtts impi-es-ns, anfractn ultimo sub(ffuso, 

 aperturd oblonyo-semiliniari, niihdiiiphi, vuliiniclld lu- 

 viiud eucausld super iniibHicuHi rrrulnhi ; nlhidil. car- 

 neo-fnscesceule pallide hitijn.scinld, ml mia-lhl i-t vircu 

 umbiUcum. intense castaned. 



The black mouth Natica. Sliell with a narrow nearly 

 covered umbilicus, oblong-ovate, somewhat pear- 

 shaped, swollen, spire small, whorls obliquely rudely 

 striated, impressed with very minute spiral strias, 

 last whorl somewhat efl'used, aperture oblong-semi- 

 lunar, rather large, columella with enamelled lamina, 

 rolled back over the umbilicus ; whitish, faintly broad- 

 ly banded with light flesh-brown, columella and 

 round the umbilicus dark chestnut. 



Lamarck, Anim. sans vert. (Deshayes edit.), vol. viii. p. 

 631. 



Nerita melanostoma, Gmelin. 

 Natica opaca, llecluz. 



Ilab. Sechelle Islands. 



Of a swollen, effused, somewhat pear-shaped, ovate 



form, very faintly dusky flesh-banded, rich dark chestnut 



on the columellar lamina and region of the umbilicus. 



Species 30. (Mus. Cuming.) 

 Natica melanostoma. Nat. testa anijuste subobtecte 



Species 31. (Mus. Cu 



Natica albumen. Nat. tenUi iirrdmiilili-r n„ibiticatd, 

 couve.ro-depre.ssd, subtus e.i'ciiriihj-ijIiiiKild. yiird )ui- 

 nutd, anfractibus convexli, lirriyntn, ad iniinilin.sime 

 decussatim striatis, aperturd subanguste semilunari, 

 umbilico late canaliculato, callositate conspicud cen- 

 trali ; aurantio-ruhescente, subtus albd. 



The albumen Natica. Shell very largely umbilicated, 

 ' convexly depressed, excavately flattened beneath, spire 



i very small, whorls convex, smooth, or very minutely 



decussately striated, aperture rather narrowly semi- 

 lunar, umbilicus broadly channelled, with a conspi- 

 cuous central callosity; orange-red, white beneath. 



Lamarck, Anim. sans" vert. (Deshayes' edit.), vol. viii. ji. 

 628. 



Hab. Catbalonga, Island of Samar, Philippines (in sandy 

 mud at six fathoms) ; Cuming. 

 Tlus well-known species is remarkably ciiaraeterized by 



its very depressed convex form. 



April, 18E 



