954 MANUAL OF THE MOLLUSCA. 
Shell usually sinistral, flat, or concaye above; aperture 
quadrangular. 
Platystoma (Suessi) Hornes, 1855. Trias, Hallstadt. 
Shell discoidal, sinistral? sculptured; peristome suddenly 
expanded, plain; aperture with an inner rim, circular, and 
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.) 
Paludestrina (lapidum) D’Orbigny part. Fresh waters of 
South America. 
Shell conic, few-whorled, epidermis green; aperture oblique, 
peristome abruptly reflected ; opereulum claw-like. The typical 
species appear to be Melaniade, but some small shells like 
Hydrobia have been included in the genus. 
PHoRvS, Montfort. Carrier-shell. 
Etymology, phoreus, a carrier. 
Synonyms, Onustus, Humph., Xenophorus, Fischer. 
Examples, P. conchyliophorus, Born. P. corrugatus, Pl. X., 
wie. A, 
Shell trochiform, concave beneath; whorls flat, 
with foliaceous or stellated margins, to which shells, 
stones, &c., are usually affixed; aperture very 
J oblique, not pearly; outer hp thin, much produced 
aboye, receding far beneath; operculum horny, im- 
bricated, nucleus external, as in purpura and palu- 
domus, with the transverse scar seen through it, Fig. 
108. (Museum Cuming.) 
Animal with an elongated (non-retractile?) proboseis; ten- 
tacles long and slender, with sessile eyes at their outer bases; 
sides plain ; foot narrow, elongated behind.—Adams. Related 
to scalaria 2 
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, and to scramble over the 
ground, like the strombs, rather than glide evenly. 
Distribution, 9 species. West Indies, India, Malacca, Philip- 
pines, China, and West America. 
Fossil, 15 species. Chalk ?—Hocene—. Britain and France. 
Fig. 108. 
