GLOSSARY. 



181 



Partitions, calcareous processes, divi- 

 ding the shells of the genus Nauti- 

 lus, Serpula, &c. 



Pectinated, resembling the teeth of a 

 comb. 



Pedicle, the support of the Lepas An- 

 atifera, and its corresponding spe- 

 cies, by which they are attached to 

 wood, &c. 



Peduncle, a foot-stalk or tube on which 

 anything is seated. 



Pediform, foot-shaped. 



Pelagic, belongmg to the deep sea. 



Pellicle, the skin or film. 



Pellucid, transparent, clear, bright. 



Pentagonal, having five angles. 



Perforated, pierced with holes. 



Pervious, admitting passage. 



Phosphorescent, emitting light in the 

 dark. 



Pillar, in univalves is the internal con- 

 tinuation of the columella or inner 

 lips, and extends from the lase 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. 



Polythalmous, divided into several 

 chambers. 



Porcate, marked with raised longitu- 

 dinal lines. 



.^orrected, projecting. 



Prismatic, generally applied to the 

 colours of shells, being like those of 

 the prism ; iridescent. 



Produced, lengthened out. 



Protrude, to thrust forward. 



Protuberances, plaits higher or more 

 elevated than the parts adjoining. 



Punctuated, with small hollows like 

 the punctures of a thimble. 



Pyriform, pear-shaped. 



Q. 



Quadrangular, having four right an- 

 gles. 

 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, turned backward. 

 Recurved, bowed back. 



Reflected, tlxrown backward, or bent 

 back. 



■n a ' ^ \ the same as recurvated. 



Refracted, abruptly bent, as if broken. 



Reniform, kidney-shaped. 



Repand, with a serpentine margin. 



Replicated, folded or plaited, so as to 

 form a groove or channel. 



Reticulated, formed like a piece of net- 

 work. 



Retrofleeted, bent backward. 



Retrousse, cocked up, turned up. 



Retroverted, turned back. 



Retuse, ending in an obtuse sinus. 



Retundated, blunted, or turned at the 

 edge. 



Reversed spire, is when the volutions 

 turn the reverse way of a common 

 corkscrew, or to the sun's apparent 

 motion. 



Revolute, rolled backward. 



Ribbed, having longitudinal or trans- 

 verse ridges. 



Ridge, the upper part of a slope. 



Rima, the interstice between the valves 

 when the hymen is removed. 



Rostrum, the beak ; the extension of 

 the shell, m which the canal is situ- 

 ated. 



Rotund, round, circular, spherical. 



Rudunentary, the commencement or 

 first elements of anything ; general- 

 ly applied to the indistinct teeth of 

 shells. 



Rufous, of a reddish colour. 



Rugose, rugged, full of wrinkles. 



Sanguinaceous, of a blood colour, or 



resembling blood. 

 Scabrous, rough, rugged, harsh, or like 



a file. 

 Scalloped, indented at the edges. 

 Scorbiculate, pitted, having the surface 



covered with hollows. 



Scorbiculous, a depression or cavity. 



Scutellated, ? . • 1 1 , 



o . nf > shield-shapca. 



Scutelliiorm, J ' 



Seam, the line formed by the union of 



the valves. 

 Semi, is used in composition in the 



sense of half. 

 Semi-cordate, half heart-shaped. 

 Semi-cylindrical, half cylindrical, cut 



through lengthways. 

 Semi-orbicular, the shape of a half 



globe. 

 Semi-lunar, the shape of a half moon. 



