TRANSACTIONS OF WAGNER 

 1278 



TERTIARY FAUNA OF FLORIDA 



terior end below the lunule rounded ; posterior slope nearly straight ; a striated 

 narrow area representing the escutcheon is bounded by a rapidly widening 

 radial ridge, in front of which is a shallow sulcus, the whole forming at its 

 intersection with the posterior border a short rostrum ; sculpture of heavy, 

 slightly recurved concentric ribs, somewhat expanded on the rostrum and 

 covered with a fine secondary close, concentric striation ; base arcuate ; hinge 

 heavy, normal, the anterior lateral small but distinct; basal margin minutely 

 crenulate ; pallial sinus small, triangular. Dimensions of varying forms : 



Elongate length 22.0, height 15.0, diameter n.o mm. , 



Normal " 26.5, " 20.5, 18.0 mm. 



Short " 18.0, " 16.5, 13.0 mm. 



A few specimens show faint radial striation on the ventral side of the ribs 

 nearest the base of the shell. 



This interesting species has the general aspect of Lirophora, the minute 

 sculpture and hinge of Artena. It is one of the more abundant species in the 

 silex beds. 



Cytherea (Artena) Shepardi n. sp. 

 PLATE 55, FIGURE 16. 



Oligocene of Hillsboro' Bay and Ballast Point, near Tampa, Florida; J. 

 Shepard, Willcox, Post, and Ball. 



Shell small, solid, subtrigonal, concentrically feebly waved, the waves more 

 distinct near the beaks, the whole surface minutely, closely, concentrically 

 striated ; lunule narrow, lanceolate, defined by a sharply incised line, but feebly 

 impressed ; escutcheon narrow, striated, defined by a sharp radial keel beyond 

 which the concentric waves do not pass ; beaks small, pointed, prosogyrate ; 

 hinge normal, anterior lateral well developed ; inner margins finely crenulate ; 

 pallial sinus small, triangular. Length 21.0, height 18.5, diameter 12.0 mm. 



This species recalls C. ucuttana in its sculpture, but it has the Chione-shape 

 of Artena and an almost rostrate posterior end. It is nearest to C. glypto- 

 concha, but is less produced and wants the prominent ribbing. 



Cytherea (Artena) undulata Conrad. 



Artena undulata Conrad, Am. Journ. Conch., vi., p. 76, 1870. Cf. Dall, Am. Journ. Sci., 

 3d Sen, xlviii., pp. 300-301, 1894. 



From the phosphatic rock of the Ashley River, South Carolina, the upper 

 or Miocene member of the Ashley and Cooper marls of Tuomey. 



