254 MAKTTAL OF THE MOLLTJSCl. 



Shell usually sinistral, flat, or concave above ; aperture 

 quadrangular. 



Flatystoma (Suessi) Homes, 1855. Trias, Hallstadt. 



Shell discoidal, sinistral ? sculptured ; peristome suddenly- 

 expanded, plain; aperture with an inner rim, circular, a ad 

 deflected (upwards) at right angles to the plane of the shell. 

 Several examples have occurred. 



Philippia (lutea) Gray, has a multi-spiral operculum, and 

 the animal is like Trochus. (Philippi.) 



Faludestrina (lapidum) D'Orbigny part. Eresh waters of 

 South America. 



Shell conic, few-whorled, epidermis green ; aperture oblique, 

 peristome abruptly reflected ; operculum claw-like. The typical 

 species appear to be Melaniadce, but some small shells like 

 Hydrobia have been included in the genus. 



PHORirs, Montfort. Carrier-shell. 



Etymology, phoreus, el carrier. 



Synonyms, Onustus, Humph., Xenophorus, I'ischer. 

 Examples, P. conchyliophorus, Born. P. corrugatus, PL X., 

 Fig. 1. 



Shell trochiform, concave beneath ; whorls flat, 



with foliaceous or stellated margins, to which shells, 



stones, &c., are usually affixed; aperture very 



f /"^^^W oblique, not pearly ; outer lip thin, much produoad 



\V v>^^ above, receding far beneath * operculum .horny, im.- 



^^^=^^ bricated, nucleus external, as in purpura and palii-' 



rig. 108. ^omus, with the transverse scar seen through it, Fig* 



108. (Museum Cuming.) 



Animal with an elongated (non-retractile?) proboscis; ten- 

 tacles long and slender, with sessile eyes at their outer bases ; 

 sides plain ; foot narrow, eloiigated behind. — Adams. Eelated 

 to scalaria ? 



Most of the phori attach foreign substances to the margins of 

 their shells as they grow, particular species affecting stones, 

 whilst others prefer shells or corals. They are called "mineral- 

 ogists" and " conchologists," by collectors; P. Solaris and 

 P. indicus are nearly or quite free from these, disguises. They 

 are said to frequent rough bottoms, q^nd to scramble over the 

 ground, like the strombs, rather than |^ide evenly. 



Distribution, 9 species. West Indies, India, Malacca, Philip- 

 pines, China, and West America, f -^ 



Fossil, 15 species. Chalk ? — Eocene — . Britain and France. 



