NATICA. 



Plate XVII. 



Spccirs 73. (Mus. Ciiming.) 



Natica filosa. Nat. tedd mhanymle umbiUcatd, cum- 

 presso-ovatd, Siyaretoided, spird Irevi, acmninatd, un- 

 fractihus dedki-corivexis, arcuatim longitudinalikr 

 striata, slriis minutis impressis nndulatis spiralibm 

 decussatd, aufractu, ultimo injlato, aperturd ampld, 

 columella mblate rejlexd ; albidd, fasciis duabiis latis 

 dilute ferrugineo-fuscis cingidatd, columella purpiireo- 

 nigricante. 



The thread-marked Natica. Shell rather narrowly 

 umbilicated, compressly ovate, inflated, Sigaretus- 

 shaped, spii'e short, acuminated, whorls slantingly 

 convex, arcuately longitudinally striated, decussated 

 with minute, waved, spiral, impressed iintu, last 

 whorl large, inflated, aperture large, columella rather 

 broadly reflected ; whitish, encircled with two broad, 

 diluted, rust-brown bands, columella purple-black. 



SowERBY, MS3., Mus. Cuming. 



Hab. ? 



This species, belonging to the group of Naticcs, par- 

 taking mostly of the character of Sigandm, is distinguished 

 by its decussated thread-like sculpture. 



Species 73. (Mus. Cuming.) 



Natica Succineoides. Nat. tcdd angude obtecte um- 

 biUcatd, compresse ovatd, spird brevi, acmninatd, an- 

 fractibus oblique plicato-striatis, snperne concavo-de- 

 clivibus, delude plano-conxexis, aufroxiu nUiiuo in- 

 jlato, aperturd ampld, basi subeffntsd, cnh'uieUd phiiio- 

 rcfie.xd, mubilicum tegente ; alba, qiidi:n,iide teuui 

 induta, columelld et area umbilicali purpureo-nigris. 



The Succinea-like Natica. Shell with a narrow co- 

 vered umbilicus, compressly ovate, spire short, acu- 

 minated, whorls obliquely plicately striated, eoncavely 

 slanting at the upper part, then flatly convex, last 

 whorl inflated, aperture large, rather eft'used at the 

 base, columella flatly reflected at the back, covering 

 the umbilicus ; white, covered with a thin epidermis, 

 columella and umbilical area purple-black. 



Hab. Pasacoa, Island of Luzon, Philippines (in sandy mud 

 at ten fathoms) ; Cuming. 



A delicate white species, having the characteristic form 



of Succii/ea, with the rich purple-black stained columella 

 broadly reileeted aud pressed down upon the umbilicus. 



Species 7k (Fig. a, Mus. Cuming ; Fig. b, Mus. Taylor.) 



Natica Seb.b. Nat. lestd anguste nmbilicatd, oblongo- 

 ovatd, tenuiculd, spird parvd, acuminatd, anfractibus 

 leviler convexis, temie plicato-striatis, slriis minutis- 

 .umis .ipiralibus impressis decussntis, aufractu ultimo 

 Mul/o tiijhdo, (iperlurd auipld, .^ithquudrulu-orntd, co- 

 luiiirllu brcriiisntlii, aiipi-nie hile apprcmt ; pelhicido- 

 iilhd, j'liam hilerdu,,, oljseiire fiisc'inld, epidermide fulm 

 induta, columelld riohiceu-J'uscd. 



Seba's Natica. Shell narrowly umbilicated, oblong- 

 ovate, rather thin, spire small, acuminated, whorls 

 slightly convex, finely plicately striated, striae decus- 

 sated with spiral, very minute, impressed stria;, last 

 whorl much inflated, aperture large, somewhat square- 

 ly ovate, columella rather short, broadly appressed at 

 the upper part ; transparent white, sometimes ob- 

 scurely banded with brown, covered with a fulvous 

 epidermis, columella violet-brown. 



Souleyet, Voyage de la Bonite, pi. 3.5, f. 0, 7. 



Hab. San Nicolas, Island of Zebu, Philippines (under 

 stones) ; Cuming. 

 A fine bold species, the largest and most inflated of the 



Sigaretus-like group. 



Species 75. (Mus. Cuming.) 



Natica Zanzibarica. Nat. testa subobtecte umbiUcatd, 

 coiupi-esse quadrato-ovatd, spird minutd, aufractibus 

 longitudinaliter plicato-striatis, striis mimUissimis im- 

 pressis spiralibus decussatis, anfractu ultimo peramplo, 

 injlato, aperturd qnndrato-ovatd, patnld, columelld 

 late rcjh'xd, limhilimui frri: l.ycnle : ulhd,fiixc'id fused 

 interrnpid ahsnu-r ninjulald. rjjidrruiidr fnlnl indutd, 

 columelld el arrd iiiMllrali iiigrirunle-vaslauris. 



The Zanzibau N.viica. Shell with a nearly covered 

 umbilicus, compressly quadrately ovate, spire very 

 small, whorls longitudinally plicately striated, strioa 

 decussated with very minute spiral impressed stria;, 

 last whorl very large, inflated, aperture squarely 

 ovate, open, columella broadly reflected back, nearly 

 covering the umbibcus; white, obscurely encircled 



