158 



JOURNAL OF THE NEW JERSEY 



Obeonie, a reversed cone. 



Obelisk-shaped, a very elongated cone 

 with the apex removed. 



Oblique, slanting ; applied to the aper- 

 ture when its length is not par- 

 allel with the axis of the shell. 



Obouate, a reversed ovate ; univalve 

 shells which have their widest part 

 nearer the apex than the anter- 

 ior end. 



Obsoletely, applied to markings which 

 are very hard to see. 



Ocelli, the minute, simple eyes found 

 in pectens and a few other genera 

 of bivalves. 



Oehreous, a dull, yeUowish orange 

 color. 



Opaque, not at all transparent or trans- 

 lucent. 



Operculum, the hard cover or lid on 

 on the foot of many univalves and 

 closing the aperture when the ani- 

 mal draws into the shell (Fig. 45, 

 A). 



Oral, pertaining to the mouth; ap- 

 plied to the tentacles nearest to the 

 mouth (Fig. 27, A). 



Orbicular, applied to shells which are 

 rounded and flattened, like a disk, 

 the spire being very low. 



Orifice, opening. 



Oi'ate, egg-shaped. 



Ovately conic, egg-shaped, but ending 

 in more or less of a co-nic point 

 (Fig. 38). 



Pallets, the small spade-shaped shells 

 at the end of siphons of the ship- 

 worms (Teredo, etc.,) (Fig. 19). 



Palliel line or impression, the mark 

 extending between the adductor 

 nniscles of bivalves, showing the 

 attachment of the mantle to the 

 shell (Fig. 7, H). 



Palpi, the feelers or tentacles of mol- 

 lusks (Fig. 28, A and B). 



Papillce, small projecting points or 

 pimples. 



Papilose, covered with pimjdes or 

 warts. 



Parietal, pertaining to or growing from 

 the inner wall or shell. 



Patelliform, the shape of a depressed 

 cone (Fig. 42). 



Patulous, open, expanded, slightly 

 spreading. 



Paucispiral, slightly spiral ; applied 

 to opercular (Fig. 49). 



Pedicel, a foot-stalk or stem. 



Pdarjic, pertaining to the sea ; ap- 

 plied to mollusks of the ojjen sea, 

 as to the squids and pteropods. 



Pellucid, transparent, clear, bright. 



Penultimate, next before the last. 



Perfoliate, having a stem passing 

 through. 



Periphery, the outside line of a form. 



Peristome, the edge around the aper- 

 ture. 



Peritrcme, the rim or extreme edge of 

 tiie aperture of univalves. 



Pestle-shaped, the shape of the pul- 

 verizing instrument used in a mor- 

 tar by druggists. 



Pervious, slightly open, as the umbili- 

 cus when small. 



Pilose, covered with distinct hairs. 



Pinnate, with branching divisions ar- 

 ranged like a feather, as the gills 

 of many univalves (Fig. 28, G). . 



Plaits, folds like the bottom of some 

 dresses (Fig. 3). 



Planorhoid, applied to disk-like shells 

 with a flat spire like planorbis. 



Plicate, folded back and forth like a 

 fan. 



Podial ridge, the ridge often found in 

 bivalve shells extending from the 

 umbo to the podium. Fig. 11, 

 dotted line A B, shows the position 

 of the podial ridge. 



Poc^ium, the lower front angle of bi- 

 valve shells (Fig. 11, B). 



Radiated, extending oft' from a })oint 

 in many directions, as the rays of 

 light from a luminous body ; the 

 ridges of Fig. 4. 



RaduJa, the chitinous ribbon bearing 

 the teeth of mollusks ; called also 

 lingual ribbon and tongue ; lingua 1 

 ribbon covered with teeth, also 

 called tongue (Fig. 31). 



Ramose, having many branches, as a 

 stem with many divisions. 



Reflected, reflexed; turned or bent 

 backward. 



Reticulated, resembling net-work ; 

 having lines crossing each other 

 like a net (Fig. 36). 



Retractile, capable of being drawn 

 back or turned inward, as the ten- 

 tacles of land snails. 



