TRANSACTIONS OF WAGNER 

 IOIO 



TERTIARY FAUNA OF FLORIDA 



Angulus Megerle, 1811, Tellinella "Gray" Morch, 1852, and Eittellina 

 Fischer, 1887, are synonymous. The group is a denizen of the warmer seas. 

 The following groups may for convenience be regarded as of sectional rank : 



Section Liotellina Fischer, 1887 (Musculus Morch, 1853, non Rafi- 



nesque, 1818). Type T. radiata Linne. 



Valves externally smooth, elongated, and convex, the left lateral laminae 

 feeble or obsolete. Tropical. 



Section Macaliopsis Cossmann, 1886. Type T. Barrandei Desh. of the 

 Parisian Eocene. 



Shell resembling Tellina proper, but usually smaller, more compressed, 

 and not brightly painted, most of the species being nearly white, with no color 

 pattern, but only a delicate suffusion, when colored at all ; hinge and sinus 

 as in Tellina; external sculpture concentric, frequently sharp and with a fine 

 radial striation. Eocene to. recent seas, especially of the warm temperate 

 region. 



This group presents little in the way of salient diagnostic characters, 

 but is a very natural one, ancient geologically and widespread. Species 

 with rounded form and obsolete fold form the section Arcopagiopsis Coss- 

 mann. 



Section Arcopagella Meek, 1871. Type A. mac tr aides Meek, Upper 

 Cretaceous of Dakota. 



This form has the form and sculpture of Moerella, and the sinus of Arco- 

 pagia. 



Section Herouvalia Cossmann, 1892. Type H. semitexta Cossmann. 

 Parisian Eocene. 



Shell small, subequi lateral, moderately convex, with a posterior trunca- 

 tion but no fold ; hinge as in Tellina; sinus squarish in front, partly confluent 

 below ; the nymphs short and the bifid cardinals rather long and thin ; the 

 lunule and escutcheon very narrow, well marked, and deeply impressed; the 

 external sculpture is mainly concentric with rays towards the ends which 

 reticulate the former. 



This little shell is very close to Linearia, a subgenus of TellinidcE described 

 by Conrad from the Upper Cretaceous in 1875. The type of Linearia exter- 

 nally resembles Semele cancellata, the hinge has a well-marked nymph, and 

 its chief peculiarity is in the lengthening of the bifid cardinals. The present 

 section differs by its greater convexity, more marked posterior truncation, and 

 shorter cardinals. Herouvalia is also very close to Elliptotellina, which has 



