TRANSACTIONS OF WAGNER 



"54 



TERTIARY FAUNA OF FLORIDA 



without a lithodesma; in its fullest development with two anterior and two 

 posterior teeth in each valve, of which the anterior ones are shorter and 

 usually regarded as " cardinals," which may be concrescent at their umbonal 

 ends, forming a A -shaped tooth, or may be free and pustular; the interior 

 face of the valves commonly shows, radial striation and the valves are fre- 

 quently distorted through the effect of the nestling habit. The species retain 

 the young between the valves until pretty well grown, and these young are 

 much more compressed than the adult shells. In many species the dental 

 formula is not fully represented by developed teeth. 



Section Mandkellia Dall, 1899 (Zoe Monterosato, non Philippi). Type 



K. pumila S. Wood. 



Shell minute, rounded ; hinge with a minute right cardinal in line with a 

 more distant anterior lamina, right posterior lamina distant, feeble ; a feeble 

 or obsolete anterior and posterior lamina in the left valve. The posterior 

 laminae are sometimes wholly absent. (See my recent "Synopsis North 

 American Leptonacea." ) 



Section Kelliola Dall, 1899. Type Kellia symmetros Jeffreys. 

 Shell minute, oblong, turgid, posterior end short; with a strong internal 

 resilium behind the beaks and a single relatively stout anterior tooth in each 

 valve, that of the right valve stouter. 



Section Divarikellia Cossmann. Type K. nitida Caillat. 



Shell oblique, rounded ; hinge-plate excavated, the edge inflected to serve 

 as laminae; the cardinals obsolete or absent; the interior of the valves with 

 elevated radial lirse which hardly affect the smoothness of the outer surface. 



Anomalokellia Cossmann seems to us better placed as a section of Erycina, 

 and Planikellia is more closely related to Lepton. Kelliopsis Verrill and Bush 

 is synonymous with Aligena Lea. 



Kellia sp. indet. 



Miocene of Barker's Landing, Choptank River, Maryland ; Harris. 



Shell oblong, moderately convex, equilateral, externally smooth or with 

 feeble concentric sculpture ; beaks low and inconspicuous ; dorsal margins 

 sloping, ends rounded, base arcuate. Lon. 9.5, alt. 7.5, diam. 4 mm. 



A single left valve of a species singularly resembling Kellia Laperousii 

 Desh. of the Pacific fauna was collected as above indicated. Unfortunately, 

 the hinge was incrusted and worn, so that the generic characters cannot be 



