GLOSSARY. 



225 



Nodose, knotty. 

 Nucleus, a kernel. 



o. 



Ob, prefixed to words, is used for 

 inversely or inverted ; as obconic, 

 inversely conic ; obcordate, in- 

 versely heart-shaped. 



Oblong, much longer than broad. 



Oblong-ovate, between egg-shaped 

 and oblong. 



Obsolete, indistinct, not well de- 

 fined. 



Ocellated, applied to eye-like spots. 



Ochreous, of the colour of yellow 

 oclire. 



Offuscated, 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 uj) of families and genera. 



Orifice, an opening or perforation. 



Ovate, shaped like the longitudinal 

 section of an e^g. 



Ovoid, approaching to the shape of 



an egg. 



P. 



Palmated, webbed, as in the feet of 



some water birds. 

 Papillae, small dots or pimples. 

 I'apiUary,"! having the surfece 

 Papillous,3 covered with dots or 



pimples. 

 Papillose, pimpled, dotted. 

 Papyraceous, thin as paper. 

 Parasitical, lining on some other 



body or animal. 

 Parietes, the walls of a shell. 

 Patulous, with a gap or opening. 

 Partitions, calcareous processes, 



dividing the shells of the genus 



Nautilus, Sei-pula, «fec. 

 Pectinated, resembUng the teeth of 



a comb. 

 Pedicle, the support of the Lepas 



Anatifera and its corresponding 



species, by which tliey are at- 

 tached to wood, &c. 

 Peduncle, a foot-stalk or tube on 



which any thing is seated. 



Pediforra, 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, ha\'ing five angles. 



Perforated, pierced with holes. 



Perlaceous, of or like mother-of- 

 pearl. 



Pervious, admitting passage. 



Phosphorescent, emitting light in 

 the dark. 



Pillar, in univalves is the internal 

 continuation of the columella, or 

 inner lips, 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 feathery appear- 

 ance. 



Polythalamous, divided into sever- 

 al chambers. 



Porrected, projecting. 



Prismatic, generally applied to the 

 colours of shells, being like those 

 of the prism ; iridescent. 



Produced, lengthened out. 



Protrude, to thrust forward. 



Protuberances, parts higher or 

 more elevated than the parts 

 adjoining. 



Punctulated, with small hollows 

 like the punctures of a thimble. 



Pyriform, pear-shaped. 



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. 

 Rectangular, having right angles. 

 Recurvated, tui-ned backwards. 

 Recurved, bowed back. 

 Reflected, thrown backwards, or 



bent back. 



Refie.xed 1 *^^ same as recwrwaf^d. 

 Reft-acted, abruptly bent, as if 



broken. 

 Reniform, kidney-shaped. 



