338 PHAEUS. 



PEESONA. Montfort, 1800. (Mask:) A genus composed of 

 Teiton Anus, Auct. and Similar species. PL xviii. fig. 401. 



PETRICOLA. Lam. {Peirus, a stone ; cola, an inhabitant.) 

 Fam. Litliopliagidse, Lam. — Bescr. Equivalve, inequilateral, 

 transversely ovate or oblong, rather irregular, anterior side 

 rounded ; posterior 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 ia 

 rocks, madrepores, &e. They may be known from Saxicava by 

 the regularity of their form and the teeth on the hinge. PL iv. 

 fig. 91, 92. 



PETEIFIED EINGEES, CANDLES, SPECTEE CANDLES, 

 &c. are vulgar terms by which fossils of the genus Belemnites 

 were formerly knovra . 



PHAKELLOPLEUEA. G-uild. 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 

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



' PL xxiv. fig. 506. 



PHANEEOPTHALMFS. Adams, Sowerby's Thesaurus, 1850. 

 A sub-genus of Bullidse, the shells of which are thus described: 

 " concealed, oval, entirely open, without more trace of a spire than 

 a curved process at the left border ; the right border prolonged 

 into a poiat slightly turned on itself." 



PHAEAMtrS. Montf. Lenttculina, B1. A genus of micro, 

 scopic Eoraminifera. 



PHAEETEITJM. Konig. (jpaperpewv, pharetrion, a quiver.)— 

 Bescr. A testaceous body composed of two conical sheaths, one 

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

 near the oral margin. 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 Ptero- 

 poda. P. fragile, PL i. fig. 3. 



PHAEIJS. Leach. MS. Gray. Syn. Brit. Mus. (undescribed.) 

 Cebatisolen, Eorbes. British Mollusca. P. 255. 



