GLOSSARY. 



225 



Nodose, knotty. 

 Nucleus, a kernel. 



o. 



Ob, prefixed to vrords, is used for 

 inversely or inverted ; as obconic, 

 inversely conic ; obcordate, in- 

 versely heart-shaped. 



Oblongs, much longer than broad. 



Oblong-ovate, between egg-shajjed 

 and oblong. 



Obsolete, indistinct, not well de- 

 fined. 



Ocellated, applied to eye-like spots. 



Ochreous, of the coloui* of yellow 

 ochre. 



Oftuscated, darkened, clouded, 

 dimmed. 



Olivaceous, of a greenish olive 

 colour. 



Operculum, a lid which closes the 

 aperture of some turbinated uni- 

 valves ; and also some of the tops 

 of multivalves. 



Orbicular, spherical, circular, 

 round. 



Order, the second division of the 

 animal kingdom. Orders are 

 made up of families and genera. 



Orifice, an opening or perforation. 



Ovate, shaped Uke the longitudinal 

 section of an egg. 



Ovoid, ajiproaching to the shape of 

 an egg. 



P. 



Palmated, webbed, as in the feet of 



some water birds. 

 Papilke, small dots or pimples. 

 Papillary,") having the surface 

 Papillous,3 covered with dots or 



pimples. 

 Papillose, pimpled, dotted. 

 Papyraceous, thin as paper. 

 Parasitical, living on some other 



body or animal. 

 Parietes, the walls of a shell. 

 Patulous, mth a gap or ojiening. 

 Partitions, calcareous processes, 



dividing the shells of the genus 



Nautilus, Serpula, &C. 

 Pectinated, resembling the teeth of 



a comb. 

 Pedicle, the support of tlie Lepas 



Anatifera anil its corresj)ouding 



species, by which they are at- 

 tached to wood, etc. 

 Peduncle, a foot-stalk or tube on 



which any thing is seated. 



Pediform, foot-shaped. 



Pelagic, belonging to the deep sea. 



Pellicle, the skin or film. 



Pellucid, transparent, clear. 



Peltate, shield-shaped, orbicular 

 and attached by a central pe- 

 dicle. 



Pentagonal, having five angles. 



I*erforated, pierced with holes. 



Perlaceous, of or like mother-of- 

 pearl. 



Pervious, admitting passage. 



Piiosphorescent, emitting light in 

 the dai'k. 



Pillar, in univalves is the internal 

 continuation of the columella, or 

 inner Ups, and extends from the 

 base to the apex. 



Pinnated, winged. 



Plaited, folded. 



Plaits, folds. 



Plicated, folded or plaited, as in 

 the pillar of the volute tribe. 



Plumose, having a feathei'y ajjpear- 

 ance. 



Polythalamous, divided into sever- 

 al chambers. 



Porrected, projecting. 



Prismatic, generally applied to the 

 colours of shells, being like those 

 of the prism ; u'idescent. 



Produced, lengthened out. 



Protrude, to tlirust forward. 



Protuberances, parts higher or 

 more elevated than the parts 

 adjoining. 



Punctulated, with small hollows 

 Uke the punctures of a thimble. 



Pyrifbrm, pear-shaped. 



Q. 



Quadrangular, having four right 



angles. 

 (Quadriplicated, having four plaits. 



R. 



Radiated, furnished with rays. 

 Radicated, is when the shell is 



fixed by the base to another body. 

 Rectangulai', liaving right angles. 

 Recurvated, turned backwards. 

 Recurved, bowed back. 

 Refiected, thrown backwards, or 



berit back. 



Retlexcd \ ^^^ same as recwoafcd. 

 Refracted, abruptly bent, as if 



broken. 

 Reiiiform, kidney-shaped. 



