BRACHIOPODA. 237 



application of this term can be based. It is therefore necessary to take the 

 first species of the typical subgenus Pronites* {Pronites adscendens) as the type 

 of Clitambonites ; and it will probably prove desirable to limit the application 

 of this term pretty nearly to the typical division included by Pander under 



Figs. 5, 6. Orthamhomtes transverm. After Pandee. 



Pronites; that is, to shells having the lower valve flat, the upper valve with 

 the greatest elevation at the beak, the greatest width of the shell along the 

 hinge, and the cardinal area vertical. It will probably be unwise to attempt 

 to maintain the term Gonambonites for forms similar in all respects to Clitam- 

 bonites except in having a backward inclination of the cardinal area. 



With the foregoing definition of Clitambonites, d'Orbigny's Orthisina is ap- 

 parently a synonym. The name was proposed in the Comptes Rendus, in 1847, but 

 no example was cited. It was again used in the same year in the Annates des Sci- 

 ences Natur elks, and accompanied by a figure without specific name. In 1850 it 

 was used in a later volume of the same work, without the specification of a type, 



Figs. 7, 8. Gonambonites lata. After Pander. 



but with mention of three species: (1) 0. anomala, Schlotheim; (2) 0. adscendens. 

 Pander; (3) 0. Verneuili, von Eichwald; and in the same year the name is again 

 defined in his Prodrome de Paleontologie Stratigraphique, etc., with the species cited 

 in the following order : (1) 0. Verneuili, (2) 0. anomala, (3) O. adscendens. 0. 

 Verneuili, if taken as the type of this group, presents a species in all generic 

 features identical with Clitambonites adscendens. Should, however, O. anomala be 

 regarded as the typical species of Orthisina, it may eventually be desirable to 



* It appears that Pronites was also a preoijcupied term, having been used by Illiqer for a genus of 

 birds, in 1811. 



