NATICA.— Plate XXIX. 



The sl'ffused Natica. Shell oblong-ovate, solid, spire 

 obtusely conoid, whoiis slantingly convex, smooth, 

 aperture semilunar-ovate, produced at the base, colu- 

 mella with a broad callosity covering tlie umbilicus ; 

 transparent white, here and there opake, tinged with 

 violet towards the apex, callosity violet. 



Huh. New Ireland. 



An obtusely conoid species, of solid growth, though 



subtransparent in character, delicately tinged with violet, 



the colour being most conspicuous on the callosity. 



Species 140. (Mus. Cuming.) 

 Xatica nucula. 'Nat. leda obiecte tiubUkatd, subqua- 

 drato-globosd, solidd, spird minuid, aiifractibus su- 

 pei-ne obtuse rotundatis, deinde subplanatis, aperturd 

 ^cmilunari-ovatd, colitmeUd callositate laid rotmulatd 

 iiiMUcum tegente; sordide lutescente-albd, apice U- 

 v'ldd. 

 The little nut Natica. Shell with a covered umbi- 

 licus, somewhat squarely globose, solid, spire very 

 small, whorls obtusely rounded at the upper part, 

 then rather flattened, aperture semilunar-ovate, colu- 

 mella with a broad button-like callosity rovcring the 

 umbilicus; dull yellowish-white, livid at the apex. 



liab. New Ireland. 



This little solid species, from the same locality as the 

 preceding, is peculiarly squarely compressed round the 

 periphery, and has a characteristic small livid spire. 



Species 141. (Mus. Cuming.) 



Natica immaculata. Nat. testd angudissime profundi 

 umbilicatd, ovato-globosd, solidiusculd, spird minuid, 

 subexsertd, anfractibus plano-convexis, aperturd ob- 

 longo-ovatu, cohimeUd s/tperue subcallo-sd ; sordide 

 alba. 

 The spotless Natica. Shell very narrowly deeply um- 

 bilicated, ovately globose, rather solid, spire minute, 

 a little exserted, whorls flatly convex, aperture ob- 

 long-ovate, columella rather callous at the upper 

 part ; dull white. 

 Totten, Silliman's Journal, vol. xxviii. p. 351. f. G. 

 Hab. Bay of Massachusetts, United States (found plenti- 

 fully in the stomachs of fishes) ; Gould. 

 Very closely allied to the little N. pisiformis from Val- 

 paraiso, but the spire is rather more exserted, and the 

 nmbilieus more contracted. 



