NATICA.— Plate I. 



presso-globosd, crasm, suhtus cancavd, spird parvd, 

 coHvexo-depressd, anfractihm ohliqiie striatic, superne 

 coiicavo-declwibus, deiiide rotundafis, aperturd pyri- 

 formi-ovatd, Iwrizontali, coltmidld teiiuicidd, ciillo- 

 sitate ampld laid spirali mnblUciim fere impletitp ; 

 pallide grised, callositate et aperturce fauce caataneo- 

 spadiceis. 



The Campeachy Natica. Shell umbilicated, depressly 

 globose, thick, concave beneath, spire small, coii- 

 vexly depressed, whorls obliquely striated, concavely 

 slanting at the upper part, then rounded, aperture 

 pyi-iformly ovate, horizontal, columella rather thiu, 

 with a large broad spiral callosity nearly filling the 

 umbilicus; light grey, callosity and interior of the 

 aperture chestnut-fawn. 



Eecluz, MS., Mus. Cuming. 



Hall. Campeachy Bay, Gulf of Mexico. 



This fine species is distinguished from its congeners of 

 the same gigantic dimensions, by its more depressly glo- 

 bose fonn and flattened spire. 



Species 3. (Mus. Cuming.) 



Natica heros. Nat. testa profimde umbilicatd, globom- 

 tiirbinatd, temdcidd, injlatd, spird subexsertd, a/ifrac- 

 J'ractibus rotimdatis, liBvit/atis, superne subdepressis, 

 juxta suturam obsolete plicato-margbudk, aperturd 

 mboblongd; sordide c'mered, epidermide temii fidvidd 

 indidd, intiis fmcescente. 



The hero Natica. Shell deeply umbilicated, globosely 

 turbinated, rather thin, inflated, spire rather ex- 

 serted, whorls rounded, smooth, slightly depressed 

 at the upper part, obsoletely plicately margined nest 



the suture, aperture suboblong; dirty ash, covered 

 with a thin fulvous epidermis, interior brownish. 



Say, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 248. 



Hab. Bay of Massachusetts, United States (on sandy and 

 muddy beaches) ; Gould. 



This fine species, distinguished by a rather light, glo- 

 bose form, is very closely allied to iV. diipUcata, so near, 

 indeed, that we have great doubt of its being actually 

 distinct. 



Species 3. (Mus. Cuming.) 



Natica Recluziana. Nat. testd obtecte mnbUicatd, co- 

 idco-tiirbinatd, cramssimd, snbtns excavato-depressd, 

 xpird siihi'xsertd, obtusd, anfractibns Icsvibus, .vipeme 

 dc'divihus, Infra convexis, aperturd oblique contractd, 

 colmnelld callositate densissime super umMlicum crasse 

 refle.vd ; sordidi cinered, juxta stduram obscure fmco- 

 fasciutd, c(dlositate carueo-fnscescade. 



Recluz's Natica. Shell with a covered umbilicus, co- 

 nicaUy turbinated, very thick, excavately depressed 

 beneath, spire rather exserted, obtuse, whorls smooth, 

 slanting at the upper part, convex below, aperture 

 obliquely contracted, columeOa with a very dense 

 callosity thickly reflected back over the umbilicus; 

 dirty ash, obscurely brown-banded next the sutm'e, 

 callosity flesh-brown. 



Deshayes, Mag. de Zool. 1841. Moll. pi. 37. 



Hab. California; Plinds. 



This fine species is remarkably characterized by its 



heavy growth and monstrous callosity. The shell figured 



by Dr. Gould at No. 1G4 of his work on the Invertebrata 



of Massachusetts as a variety of iV. dupUcata appears to 



be an immatm-e N. Reclu:iaua. 



