728 CLASS. XII. 
Comp. Drrrance Dict, des Sc. natur. XXII. 1821, pp. 169, 170, 
DesuHayeEs Dict. class. d’Hist. nat. VIII. pp. 200, 201. This genus stands 
as in the middle between Spondylus and Pecten. Besides the fossil species 
upon which DEFRANCE has founded it (Hinnites Cortesti, Buainv. Malae. 
Pl. 61, fig. 1), DesHayes refers to it Pecten sinuosus LAM., Ostrea sinuosa 
GMEL. 
Pecten Brua. (Species of Ostrea L.). Shell free, inequivalve, 
mostly ribbed with longitudinal rays, auriculate, with apical margin 
straight and apices contiguous. Hinge edentulous, with small 
cardinal pit internal, receiving the ligament. Animal (Argus PoLt) 
orbicular, with mantle margined by cirri and ocelliferous tentacles, 
the foot small, sometimes byssiferous. 
Sp. Pecten Jacobeus Lam., Ostrea Jacobewa L., Pout Test. utr. Sicil. Tab. 27, 
figs. 1, 2; Buarnv. Malacol. Pl. 60, fig. 4 ;—St James’ shell, Mediterranean ; 
the shell is with us often used for stewing oysters, but the animal itself is, 
when roasted, very agreeable according to Pout. This species also is found 
fossil in newer tertiary formations in Italy.—Pecten pleuronectes Lam., 
Ostrea pleuronectes Li.; Rumen. Amb. Rariteitk. Tab. 45, figs. a, B, BLAINV. 
Malac. Pl. 60, fig. 5, Cuv. R. Ani., éd. ill., Moll. Pl. 75, fig. 1. A very 
numerous genus, of which many extinct species are found in the secondary 
formations. 
Pedum Bruce. Shell free, inequivalve, elongato-trigonal. Hinge 
edentulous. Inferior valve emarginate near the pomt. Animal 
with mantle cirri and ocelliferous tentacles. Foot byssiferous, the 
byssus passing through the excised valve. 
Sp. Pedum spondyloidewum Lam., Encycl. méth., Vers. Pl. 178, Buatny. 
Malac. Pl. 62, fig. 6, Cuv. R. Ani., éd. ill., Moll. Pl. 76, fig. 4, DESHAYES 
Conchyl. Pl. 48, figs. 4—6. In the Indian ocean and the South Pacific ; 
by Quoy and GarmarpD, who first described the animal of this shell, this 
species was found very numerous at the Island Vanikoro, 
Lima Brug. Shell free, subequivalve, inequilateral, oblique, 
furnished with small auricule, subgaping at the side. Hinge 
edentulous. Animal (Glawcus Pout) with mantle margined with 
long annulate cirri and without ocelliferous tentacles. Foot cylin- 
drical, rugose, clavate, sulcated at the apex. (Animals swimming 
by contraction of the valves.) 
Sp. Lima squamosa, Ostrea Lima L., Pow Test. utr. Sicil. 11. Tab. 28, figs. 
22—24, Buatnv. Malac. Pl. 62, fig. 3, &c. The fossil genus Plagiostoma 
SowrrBy, Lam., contains different species which belong to Podopsis, or 
rather to Spondylus. The remaining, according to the remark of DESHAYES, 
ought to be united with the genus Zima, for instance Plagiostoma gigan- 
tewm from the Lias-formation. 
