LAMELLIBEANCHIATA. 485 



Classification of paleozoic LamelUbranclilata.l 



CLASSIFICATION OF PALEOZOIC LAMELLIBEANCHIATA. 



Subkingdom JN/LOijJL U oO-A.. 

 Class LAMELLIBRANCHIATA, BlamvUle. 



Order ASIPHONIDA, Woodward. 

 Mantle lobes separate, siphons wanting. Pallial line without sinus. 



Suborder MONOMTARIA. 

 A single adductor muscle, the anterior one wanting. 



Family PECTENID^, Lamarck. 



Genera: Aviculopeeten, McCoy; Crenipeeten, Hall; Euehondria, Meek; I/yriopecten, Hall; Pernopecten, 

 Winchell; Pterinopecten, Hall; Streblopteria, McCoy. 



Suborder HETEROMYARIA. 



Anterior adductor muscle very small, the posterior one large. 



Family AVICULID^, d'Orbigny. 



Gbneea : Actinopteria, Hall; Bakevellia, King; Ectenodesma, Hall; Olyptodesma, Hall; Liopteria, Hall; 

 Leptodesma, Hall; Limoptera, Hall; Monoptera, Meek and Worthen; Monotis, Bronn; 

 ? Palceopinna, Hall; Posidonomya, Bronn; Pseudomonotis, Beyrich; Pterinea, Goldfussf'Fer- 

 tumia, Hall); Pteronitella, Billings; Pteronites, McCoy; ? Ptychopteria, Hall. 



Family PINNID^, Gray. 



Genera : Aiiiculopinna, Meek; Pinna, Linne. 



Family AMBONYCHIID^, Miller. 



Genera: Anonychia, Ulricb; Ambonychia, Hall (restricted); Amphicoelia, Hall; ^flnomafodonto. Miller; 

 Anoptera, Ulrich ; Byssonychia, XJlrich; Byssopteria, Hall; Clionychia, Ulrich ; Ectenoptera, 

 Ulrich; Eridonychia, Ulrich; Myiilarca, Hall; PaXaeocardia, Hall; Plethomytilus, Hall. 

 Psilonychia, Ulrich. 



Family CH^NOCARDIID^, Miller. 



Genera : Chcenooardia, Meek and Worthen; Megambonia, Hall. 



Family MYTILID^, Lamarck. 



Genera : ? Anthraoomya, Salter; ? Anthracoptera, Salter; Gosselettia, Barrois; Lithodomus, Cuvier (Litho- 

 phaga, Bolton); Modiella, Hall; Modiola, Lamarck; Myalina, Koninck; Mytilops, Hall; 

 ? Spathella, Hall. 



Family MODIOLOPSID^, Ulrich. 



Genera : Aetinoniya, U.lrich; f Aristerella, Ulrich; Colpomya, Ulrich; f Cymatonota, Ulrich; ? Cyprieardella, 

 Hall ; f Endodesma, Ulrich ; Eurymya, Ulrich ; Goniophora, Phillips ; Modiolodon, Ulfich ; 

 Modiolopsis, Hall; Modiomorpha, Hall; Orthodesma, Hall and Whitfield; ? Prolobella, Ulrich; 

 ? Psiloconcha, Ulrich; f Pyanomya, Miller. 



