MONOCEROS. 



Plate IV. 



Species 13. (Mus. Cuming.) 

 [OKOCEKOS ACUMINATUM. Mon. testd ohlongo-ovatd, 

 spird pecuUariter acumhiatd ; spiraliter lirata,lins 

 parvis, subdistantihus. Urn mtmtitikque lemmume 

 sqummtis, squamk interdum in lamhm contmuiier 

 decurrentihus ; alhidd, ferrugineo-fmco varid, apertura 

 alhd, lahri margine intiis piirpureo-fuscd. 

 'HE ACUMINATED MoNOCEEOs. ShcU obloBg-ovate, 

 spire particularlv acuminated, spiraUy ridged, ridges 

 smaU, rather distant, ridges together with the inter- 

 stices very finely scaled, the scales sometimes runmng 

 do^vn continuously in lamina; white, vanegated 

 with rusty brown, aperture white, edge of the lip 

 tinged witliin with purple-hrown. 

 30WERBY, Conch, niustrations, Monoceros, Fig. 10. 

 Sab. Valdivia, Chili (on rocks at low water); Cuming. 



Approximating very closely in general character to the 

 W. cnmilabrnm, but so widely removed from it m form, 

 that it is impossible to be reconciled to the propriety 

 of maintaining the M. calcar and imbrkatum, as distmct 

 species ^vithout adopting the distinction in the present 



case. 



Species 14. (Fig. a, b, c, d, Mus. Cuming.) 

 MoNOCEKOS CEASSILABEUM. Mon. testd ovaid, cra.ssi^- 

 dmd, ponderosd, md Icnncjatd ant squamiltrata ; 

 aperturd pared, labro mlde plano-incrassato, margme 

 Memo, obsolete dentiadato, dente acuta, erecto ; citnno 

 vel rubente-fusco, columelld labroque lactem. 



The THICK-LIP MoNOCEROS. Shell ovate, very thick, 

 ponderous, either smooth or scaly ridged ; aperture 

 small, lip very flatly tliickened, inner edge obsoletely 

 denticulated, "tooth sharp, erect ; citron yellow or 

 reddish brown, lip and columeUa milk-wliite. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. x. p. 120 

 Fig. 14 c. Monoceros globulus, Sowerby. 

 Fig. 14 d. Monoceros citrimm, Sowerby. 



Eab. Valparaiso, Chili (vmder stones at low water); 

 Cuming. 

 Chiefly distinguished by its broad flattened lip. 



Species 15. (Mus. Cuming.) 

 MONOCEEOS GLABEATUM. Mon. testd oblongo-ovatu, eras- 



siuseuld, spird subacuminatd ; anfractAus convexis, 



gjabrath, Mro obllqui planaio, dente acuto, erecto; 



rnhente-fasco varid, lahro et apertura fame albis. 

 The SMOOTH Monoceros. SheU oblong-ovate, rather 



thick spire somewhat acuminated; whorls convex, 



smoo'th, lip obliquely flattened, tooth sharp, erect; 



variegated with reddish brown, lip and interior ot 



the aperture white. 

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



p. 120. ^ ^, . 



Eab. Island of Chiloe (on rocks at low water); Cuming. 



Little more, apparently, than an acuminated growth of 

 i the preceding species. 



September, 1846. 



