TRANSACTIONS OF WAGNER 

 1242 



TERTIARY FAUNA OF FLORIDA 



Transennella carolinensis n. sp. 

 PLATE 55, FIGURE 4. 



Miocene of North Carolina at Magnolia and the Natural Well of Duplin 

 County ; Burns, Hodge, etc. 



Shell small, subequilateral, cythereaeform, rather solid and thick for its size ; 

 plump, with low, slightly anteriorly directed beaks ; polished, nearly smooth 

 in the middle, towards the ends having somewhat irregularly concentric bevelled 

 sulci ; lunule impressed, lanceolate, bounded by an incised line, striated ; hinge 

 normal, the middle left cardinal bifid ; marginal sulcations strong ; pallial sinus 

 short, nearly horizontal, rounded in front. Length u, height 9, diameter 6 mm. 



This species was obtained by Hodge in North Carolina more than sixty 

 years ago and was listed as Cytherea carolinensis in several papers and check- 

 lists by Conrad and Meek, but never figured or described. A specimen named 

 by Conrad and collected by Hodge in North Carolina was presented by the 

 latter to the National Institute and subsequently became part of the collection 

 of the National Museum, thus enabling me to recognize the nude name, which 

 I now adopt, as it may have some currency in collections. The species has also 

 been called Dione carolinensis. It is more heavy and trigonal than the follow- 

 ing species, more equilateral and smoother. It is much larger than any of the 

 species antedating the Miocene. 



Transennella caloosana n. sp. 

 PLATE 57, FIGURE 2. 



Upper Miocene of Jackson Bluff, south of Tallahassee, Florida, Vaughan ; 

 Pliocene of the Caloosahatchie, Shell Creek, and the Myakka River, south 

 Florida, Dall, Burns, and Willcox; Pleistocene of North Creek, near Osprey, 

 Florida, Dall. 



Shell elongate-ovate, inequilateral, wifh small, acute beaks, anteriorly 

 directed and situated at the anterior third ; surface polished, smooth in the 

 middle of the disk; towards each end irregularly concentrically sulcate with 

 rather close, somewhat bevelled sulci ; the middle of the disk is often crossed 

 by obscure radial threads, which are sometimes strong enough to crenulate the 

 outer margin ; lunule impressed, very narrow, lanceolate, bounded by a sulcate 

 line; hinge with the posterior right and middle left cardinals bifid, margins 

 strongly sulcate, pallial sinus small, linguiform. Length, 13.5, height 10.0, 

 diameter 5.5 mm. 



This species is nearest to T. cubaniana Orbigny of the recent species, but 

 is larger, with less uniform sulcation and shorter pallial sinus. It is more 



