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5. Dentes cardinales non divergentes. 
Stirps 11. 
B. Lamella seepius nulla ante et pone dentes cardinales. 
a. Umbones ante aut pone medium locati. 
Stirps 3. 
b. Umbones pone teste medium locati. 
Stirps 4. 
e. Umbones subcentrales. 
Stirps 2. Umbones non prominentes. 
Stirps 7. Umbones prominentes et antrorsum curvati. Teste 
subrotundatz impressione cordiformi imperfecta. 
Stirps 9. Umbones prominentes recurvi. Teste rotundate 
impressione cordiformi nulla. 
Stirps 5. Umbones subcentrales prominentes recurvi. Teste 
subcordiformes impressione cordiformi perfecta. 
Stirps 6. Umbones subcentrales valde prominentes et recurvi. 
Teste subrotundate, aut subglobose. 
Stirps 8. Umbones prominentes antrorsum curvati. Teste 
subcordatz impressione cordiformi perfecta. 
STIRPS I. 
The shells equally convex ; the cardinal teeth diverging, and 
generally with a lamella placed before and behind them. 
Synopsis Generum. 
* Lamella pone dentes cardinales locata. 
Testee ovato-globose ; umbones subcentrales 
prominentes obtusi. Dentes cardinales 
duo simplices in utraque valva, lamella 
compressa pone dentes cardinales locata.. 34. AUTONGE. 
** TLamella ante et pone dentes cardinales locata. 
Testze ovato-globosze ; umbones centrales tu- 
