ORDER in TELEODESMACEA 4 1 1 



a pair of lateral laminae in each valve, the anterior laminae often absent, 

 and the posterior frequently closely adjacent tn t}- /v.</// /////, 

 Emulating cardinals. One Cretaceou^ and a numlii-r <>)' 

 Tertiary and Recent species. '^ X"X 



Erycina (Lam.), Fischer (Fig. 750) ; Kelli". Tuilmi ; 

 Pythina, Hinds ; Lasea, Leach ; Lepton, Turton ; Erycinella, 

 Conrad ; Spaniodon, Reuss ; Fabella, Conrad., etc. Tertiary 

 and Recent. 



Family 23. G-aleommidae. Gray. 



Shell without a perceptible epidermis; valves equal, free, './/,/<-/,/, inn 



widely gaping ventrally, smooth, or variably sculptured ; Caicaire Grassier ; Fames. P., 

 adductor scars distant, oval; pallial line JJj^ 0| ,.; ; '.-.luva!'. 



simple; ligament usually obsolete, resilium Greatly enlarged (after i>>- 

 internal, sub-umbonal, or oblique, attached 8 ayes ' 

 to an excavated chondrophore in each valve; hinge plate hardly 

 developed ; laterals obscure or absent ; one or two cardinal teeth in 

 each valve or none. Tertiary and Recent. 



Scintilla, Desh. (Fig. 751) ; Galeomma, Turton ; Passyia, 

 Sportella, Desh. ; Hindsiella, Stol. ; Ephippodonta, Tate, etc. 



SciniiOa. parisiensis, Tertiary and Recent. 

 Desh. Upper Eocene ; 

 Auvers, near Paris. 2/ 3 



(after Deshayes). Family 24. Chlamydoconchidae. Dall. 



Shell cellulo-crystalline without an epidermis, comprising the prodissoconch with 

 narrow, long laminar accretions, very small; valves wholly internal, not connected, con- 

 tained in laterodorsal separate capsules, without hinge or hinge plate, not attached to 

 muscles or ligament ; ligament absent, resilium separately encapsuled between the obsolete 

 valves, functionless. Recent ; California. 



The genus Chlamydoconcha, Dall, is evidently the last term in a series beginning 

 with forms like Lepton, and continued by Galeomma and Ephippodonta, but the 

 specialisation has been carried so far that it may well be regarded as the type of 

 a distinct family. 



Family 25. Kelliellidae. Fischer. 



Shell with a periostracum ; valves equal, free, closed, smooth externally with plttin 

 margins; pallial line simple; area obscure or none; ligament external, parivincnlar ; 

 resilium external or slightly sunken; hinge plate narrow, entire, with one or two 

 cardinals, and a single anterior lateral placed above the anterior cardinal tooth. Tertiary 

 and Recent. 



Kelliella, Sars ; Lutetia, Desh.; ? Allopagus, Stol.; Turtonia, Forbes. Eocene to 

 Recent. 



C. CYCLODONTA. 



Teeth arched, springing from below the hinge margin, with the hinge plate obscure or 

 absent. 



Superfamily 9. CARDIACEA. Lamarck. 



Lobes of the mantle free behind the siphons, foot elongate, geniculate ; sculpture of 

 the shell chiefly radial ; cardinal teeth conical, the lateral laminae short, distant from the 

 cardinals. 



