PHASIANELLA. 223 



Lithophagidae, Lam. — Descr. Equivalve, inequilateral, transversely 

 ovate or oblong, rather irregular, anterior side rounded ; poste- 

 rior side more or less attenuated, slightly gaping ; hinge with 

 two cardinal teeth in each valve ; muscular impressions two in 

 each valve ; palleal impression entire ; ligament external. — Obs. 

 The Petricolae are found in holes made by the animals in rocks, 

 madrepores, &c. They may be known from Saxicava by the 

 regularity of their form and the teeth on the hinge. Fig. 91, 92. 



PETRIFIED FINGERS, CANDLES, SPECTRE CANDLES, &c. 

 are vulgar terms by which fossils of the genus Belemnites were 

 formerly known. 



PHAKELLOPLEURA. Guild. A genus composed of those 

 species of Chiton, Auct. which have bunches of hairs or hyaline 

 bristles on each side of each valve on the margin. The Chiton 

 fascicularis, found on our own coasts, is a well known example. 

 Fig. 506. 



PHARAMUS. Montf. Lenticulina, Bl. A genus of micro- 

 scopic Foraminifera. 



PHARETRIUM. Konig. ((f>apETp£<i)i>, pharetrion> a quiver.) — Desc?\ 

 A testaceous body composed of two conical sheaths, one within 

 the other, perforated at the apex, and joined together near the 

 oral margin. P. fragile, fig. 3. In describing this genus, which 

 appears to be the same as Entalis of Defrance, Mr. Konig 

 expresses the supposition that it may probably belong to the class 

 Pteropoda. 



PHASIANELLA. Auct. (Phasianus, a pheasant.) Fam. Tur- 

 binacea, Lam.. Ellipsostomata, Bl.— Descr, Smooth, oval, varie- 

 gated ; aperture entire, oval ; outer-lip thin ; inner-lip thin, 

 spread over a portion of the body whorl ; columella smooth, 

 rather thickened towards the base ; operculum horny, spiral 

 within ; testaceous, incrassated without. Britain, Mediterra- 

 nean, &c. ; the fine large species are Australian. Some fossil 

 species are found in the tertiary beds. — Obs. The shells com- 

 posing this genus are richly marked with lines and waves of 

 various and delicate colours, and if the genus be restricted to 

 those species which are smooth, and which have a thick shelly 



