FUEQUENXLY U^ED IN CONCHOLOGY". 



151 



Posticus, behind, used to express the 



back part. 

 Prcetenids, very thin. 

 Primarius, tlie chief. 

 Productus, produced, extended. 

 Profundus, deep. 



Prominens, prominent, standing out. 

 Proniinulus, rather prominent. 

 Propinquus, near. 

 Pubes, down. 

 Pubescens, downy. 

 Punctatus, dotted. 

 Punctus, a point, a prick. 

 Purpurasceris, purplish. 

 Piriformis, shaped like a pear. 



Quadratus, four-sided. 



Radiatus, with lines like rays diverg- 

 ing from a centre. 

 Radii, rays. 

 Ramosus, branching. 

 Rectirvalus, turned backwards. 

 Recurvus, hooked, curved back. 

 Rectus, straight. 

 Refexus, bent back. 

 Remotus, distant. 

 Reniformis, kidney-shaped. 

 Repandus, bowed or bent back, broad 



or flat. 

 Resupinatus, lying on its back, or 



turned upwards. 

 Reticulattts, reticulated, as if covered 



with network. 

 Retractus, drawn back. 

 Retrorsiim, backward. 

 lietusus, blunt. 

 Revolutus, rolled back. 

 Rhombus, used to express a diamond 

 or lozenge shape. 



Rigidus, stiff. 



Rima, a chink, a cleft, in bivalves, 

 where the connecting cartilage is 

 fixed. 



Riugens, gaping. 



Roseus, rosy, rose-coloured. 



Rostralus, having a beak ; in bivalves, 

 having the fore part long and nar- 

 row : Tellina rostrata. 



Rostrum, a beak ; where the extre- 

 mity or base is drawn out to a long- 

 point, in univalves. 



Rotatus, wheel-shaped. 



Rotundatus, rounded. 



Rubicundus, very red. 



Rudis, rough, coarse, as if unfiiiished. 



Rufescens, reddish. 



Ruga, a wiinkle. 



Rugosus, wrinkled. 



Rupes, a rock. 



Saxum, a stone, a rock. 



Scaber, rough, rugged. 



Scandens, climbing. 



Scriptus, marked with various cha- 

 racters like writing. 



Scrobiculatus, furrowed with irregular 

 seams. 



Scrobiculus, a hollow at the hinge 

 that receives a tooth or cartilage. 



ScutcUum, a shield. 



Serratus, like the teeth of a saw. 



Sericeus, silky. 



Setaceus, bristly. 



Setosus, hairy. 



Sinister, applied to those shells which 

 turn to the left, the same «ay as 

 the sun. 

 Sinistra, on the left side. 



