728 CLASS xu. 



Comp. DEFRANCE Diet, des Sc. natur. xxu. 1821, pp. 169, 170, 

 DESHAYES Diet, class. d'Hist. nat. vin. 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 Corlesii, BLATNV. Malac. 

 PI. 6 1, fig. i), DESHAYES refers to it Pecten sinuosus LAM., Ostrea sinuosa 

 GMEL. 



Pecten BRUG. (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^QiA) 

 orbicular, with mantle margined by cirri and ocelliferous tentacles, 

 the foot small, sometimes byssiferous. 



Sp. Pecten Jacobceus LAM., Ostrea Jacobcea L., POLI Test. utr. Sicil. Tab. 27, 

 figs. 1,2; BLAINV. Malacol. PI. 60, fig. 4 ; St James 1 shell, Mediterranean ; 

 the shell is with us often used for stewing oysters, but the animal itself is, 

 when roasted, very agreeable according to POLL This species also is found 

 fossil in newer tertiary formations in Italy. Pecten pleuronectes LAM., 

 Ostrea pleuronectes L., EUMPH. Ami. Rariteitk. Tab. 45, figs. A, B, BLAINV. 

 Malac. PI. 60, fig. 5, Cuv. R. Ani., ed. ill., Moll. PI. 75, fig. I. A very 

 numerous genus, of which many extinct species are found in the secondary 

 formations. 



Pedum BRUG. Shell free, inequivalve, elongato-trigonal. Hinge 

 edentulous. Inferior valve emarginate near the point. Animal 

 with mantle cirri and ocelliferous tentacles. Foot byssiferous, the 

 byssus passing through the excised valve. 



Sp. Pedum spondyloldeum LAM., Encycl. meth., Vers. PI. 178, BLAINV. 

 Malac. PI. 62, fig. 6, Cuv. R. Ani., ed. ill., Moll. PI. 76, fig. 4, DESHAYES 

 Conchyl. PI. 48, figs. 4 6. In the Indian ocean and the South Pacific. ; 

 by QuOY and GAIMARD, 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 auriculae, subgaping at the side. Hinge 

 edentulous. Animal (Glaucus POLI) 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., POLI Test. utr. Sicil. II. Tab. 28, figs. 

 22 24, BLAINV. Malac. PI. 62, fig. 3, &c. The fossil genus Plagiostoma 

 SoWERBY, 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 Lima, for instance Plagiostoma yigan- 

 from the Lias-formation. 



