NATICA. 



Species 37. (Mus. Cumiug.) 

 Natica Baconi. Nat. testa obtecte mibillcatd, ahhre- 

 viato-irocliiformi, crassd, spird brevi, obtusd, avfractl- 

 iiis obliqite dense miimtissime striafis, s/ijicnit: ih'rliri- 

 biis, ad sutiiram rudibus et callosis, ad baiui rutmiihttis, 

 aperturd semilunaj-i, horiiontali, coliiiiiel/d sidiaciitd, 

 callositate densd rudi mnbiUcum implente ; candes- 

 cente-gj-ised, h-regulariler pallide strigatd, basi al- 

 hidd. 

 Bacon's Natica. Shell with a covered umbilicus, ab- 

 breviately trochus-shaped, thick, spire short, obtuse, 

 whorls obliquely, densely, very minutely striated, 

 slanting at the upper part, rude and callous at the 

 suture, rounded at the base, aperture semilunar, ho- 

 rizontal, columella rather shaqi, with a rude dense 

 callosity filling the umbilicus ; bluish-grey, irregularly 

 pale streaked, white at the base. 

 Hub. Mouth of the Swau River, New Holland ; Dr. Bacon. 

 A solid trochoid species, of rude structure, of a bluish- 

 grey colour, irregularly interrupted with pale streaks nm- 

 nins into the base, which is white. 



Species 38. (^Mus. Cuming.) 



Natica intermema. Nai. te.std obtecte nvibilicatd, ob- 

 lo/igo-globosd, cras.sd, poiide?-osd, .ipird pared, mncro- 

 natd, anfractibus lavigatis, nitentibus, superne decli- 

 vibus, delude plano-convexis, aperturd semilimari, co- 

 Imnetld callositate densis.wnd, umbilicnm implente ; al- 

 bidd, riifo-ferrugiiieo tliictd. 



The intermediate Natica. Shell with a covered um- 

 bilicus, oblong-globose, thick, ponderous, spire small, 

 pointed, whorls smooth, shining, slanting round the 

 .upper part, then flatly convex, aperture semilunar, 

 columella with a very thick callosity, filling the um- 

 bilicus ; whitish, stained with red rust. 



Philippi, Kuster Conch, pi. 18. f. 10. 



Hab. ? 



This species, of a rather flattened oblong-globose form, 

 with a small pointed spire, is peculiarly stained with red 



Species 39. (Mus. Cuming.) 



Natica vitellus. Nat. jirofnnd'i subanyiisfe unibilicald, 

 globosd, solidiuscidd, spird brevi, apice acuta, anfrac- 

 tibus rotundatis, loevigatis, aperturd semilunari, co- 

 lumelld callosd, eticausto super umbilicum partim re- 

 voluto ; ustulato-aurantid, maculis albis perpaucis pro- 

 miscuis interrupid, columelld et apertura: fauce albis. 



The egg-yolk Natica. Shell deeply, rather narrowly 

 umbilioated, globose, rather solid, spire short, sharp 



at the apes, whorls rounded, smooth, aperture semi- 

 lunar, columella callous, the enamel partially rolled 

 back over the lunbilicus ; burnt orange, inten-upted 

 with a few promiscuous white blotches, columella 

 and interior of aperture white. 

 Lamarck, Auim. sans vert. vol. viii. p. 637. 



Nerita vitellus, Linnreus. 

 Ilab. Island of Ticao, Philippines (on the reefs) ; Cuming. 

 This well-known species is always distinctly charac- 

 terized by its peculiar burnt-orange colouring, interrupted 

 w-ith a few gaps wanting colour. 



Species 10. (Mus. Cuming.) 



Natica bifasciata. Nat. testd anguste subobtecte umbi- 

 licatd, oblongo-globosd, spird subcxsertd, anfractibus 

 dense minute striatis, rotundatis, spadiceo-fuscescente, 

 ad suluras albis, fasciis angustis albis subdistantibus 

 medio cingulatis, aperturd oblongo-ovatd, columelld 

 callosd, encausto super mnbilicum pai-tim revoluto ; en- 

 causto coluniellari intense violaceo-ca-staneo. 



The two-banded Natica. Shell with a narrow nearly 

 covered umbilicus, oblong-globose, spire rather e.\- 

 serted, whorls densely minutely striated, rounded, 

 light fawn brown, white next the suture, encircled 

 round the middle with two narrow, rather distant, 

 wliite bands, aperture oblong-ovate, columella cal- 

 lous, enamel partially roUed back over the umbilicus ; 

 columellar enamel deep violet-chestnut. 



Gray, Griffith's Cuvier's Animal Kingdom, pi. 1. f. 2. 



Hab. Guaymas, Gulf of California (on the sands at low 

 water) ; Mr. Babb, R.N. 

 An elegant species, of a characteristic oblong-globose 



form, distinguished by two linear white bauds upon a light 



fawu-brown ground, the columellar euamel being a deep 



chestnut. 



Species 41. (Mus. Cuming.) 



Natica dubia. Nat. testd obtecte wmbilicatd, globosd, 

 cras-id, ponderosd, spird parvd, snturd callosd, indis- 

 tincld, anfractibus rotmidatis, politis, aperturd semi- 

 liinari, parvd, columelld den-ie callosd, callositate um- 

 bilicum implente; stramineo-ebiirned. 



TnE doubtful Natica. Shell with a covered umbilicus, 

 globose, thick, ponderous, spire small, suture callous, 

 indistinct, whorls rounded, polished, aperture semi- 

 lunar, small, columella densely callous, callosity fill- 

 ing the umbilicus ; straw-tinted ivory. 



Recluz, Pro. Zool. Soc. 1S43, p. 209. 



Hab. ChUi ? 



A very solid globular shell, of polished surface, lik(; 



straw-tinted ivory. 



.\pril, 185S 



