NKItKITES. 



NEIIITA. 



of revel* creeps ; there are beside* two tubercles to ech of their feet, 

 two bunche* of filament*, * clrrhui above, and one below. 



Lamarck nUtw that the antenna- of the Nereids are in general short 

 The eyes, when distinct, he lays, are four in number. The proboscis 

 is large, open at Ha extremity, anil often furnished with salient points 

 or small tentacle*. Lamarck divides them into six genera, namely, 

 Lytorit, Xrpktyt, (ilycrra, HttioHt, 1'kyllodon, and Syliit, principally 

 on the ground of the presence or absence of jaws, and the modifications 

 of the antenna' : to these he adds Spio. 



The Nereids are widely spread, and some of the species are found 

 in moat sea*. Some are found on our own coasts. [AsxEun.v.] 



NKHKITES, a genus of Fossil Anntltda, from the Lower Silurian 

 Strata of Lampeter, in South Wales. [Murchiaon.] 



N KRITA, a genus of Qasteropodons Molltuca, the type of the family 

 A'tritidtt. The genus Aferifo has the following characters : Shell 

 thick, smooth, or spirally grooved ; epidermis horny ; outer lip thick- 

 ened, and sometimes denticulated within ; columella broad and flat, 

 with iU inner edge straight and toothed; operculum shelly. 



A*, polila has the shell thick, smooth, somewhat shining, longitudi- 

 nally striated very finely, varying in colour ; the spire very retuse, the 

 lip toothed, smooth above. (Lam.) 



Xcrita polita, with it animal. ' Astrolabe.' 



This species, according to Messrs. Quoy and Oaimard, is the most 

 plentifully diffused of any of the genus, and is found in nearly all the 



seas of warm climates. It u heavy, polished, marbled, and often 

 coloured with three red transverse bands. 



The animal is of a uniform yellowUh-white, with the exception of 

 the tentacles, which are of a smoky-brown colour. 



.V. Atcaaionit has the shell solid, transversely fu.-rowedly ribbed, 

 greenish-gray, spotted with white and brown : spire prominent, the 

 apex yellow ; aperture white ; the lip toothed, rugous above : marked 

 above with a yellow spot (Lam.) 



This shell is deeply striated, rugous, yellowish-gray, with circum- 

 scribed brown spots upon the parts in relief; aperture smooth, yellowish- 

 white ; peristome dotted with white and brown. 



Am'/d Aictntionu. 

 a, shell, with animal ; b, operculum. 



The animal has the foot yellow below, striated and dotted with 

 deep-brown on the sides, so as to appear nearly black on a yellowish 

 ground. The head, which has a very expanded hood, is striated in 

 the same manner. The neck ia violet The tentacles are long, pointed, 

 lively-brown, striated longitudinally with black. The eyes, placed at 

 their base, are at the extremity of a triangular palette of yellowish- 

 white, having a black stripe at the external border. The mantle has 

 its contour dotted with brown. The operculum is red-brown, very 

 much granulated, angular at the posterior border, and provided with a 

 very projecting heel or process. It is found in the Island of Ascension. 

 (' Astrolabe.') 



END OF VOLUME III. 



BlUDBl-aY JtKD ETAKS, MUKTOIS, 



