FREE INSTITUTE OF SCIENCE 



1277 



TERTIARY FAUNA OF FLORIDA ' ' 



distinct ; inner margins, except the posterior margin, finely crenulate ; palliai 

 sinus very small, triangular ; outer edges of the adductor scars usually a little 

 raised. Length 19.0, height 16.5, diameter 8.0 mm. 



This neat little shell grows to a somewhat larger size, as fragments indi- 

 cating individuals one-third larger than the measurements given are in the 

 collection. It is from this stem that the upper Oligocene and Miocene Artena 

 seems to be derived. 



Cytherea (Ventricola) Blandiana Guppy. 

 Venus Blandiana Guppy, Geol. Mag., Decade ii., vol. i., p. 444, pi. xvii., fig 8, 1874. 



Oligocene of Bowden, Jamaica, Vendryes, Henderson, and Simpson ; of 

 Haiti, Guppy ; of Florida at White Beach, near Osprey, and the Chipola beds 

 on the Chipola River, Calhoun County, and of Curagoa, Dutch West Indies. 



This species recalls C. strigillina Dall, of the recent West Indian fauna, 

 but has the primary concentric lamellae lower and more distant, the secondary 

 sculpture more distinct, and a more elongated outline. The young shells are 

 more rounded than the adults. 



Cytherea (Ventricola) rugatina Heilprin. 



Venus rugatina Heilprin, Trans. Wagner Inst, i., p. 92, pi. xi., fig. 24, 1887; Dall and 

 Simpson, Moll, of Porto Rico, p. 483, 1901. 



Pliocene beds of the Caloosahatchie River and Shell Creek, south Florida, 

 Willcox, Dall, and Burns; living from Cape Hatteras, North Carolina, to the 

 Florida Keys, and at Mayaguez, Porto Rico, West Indies, United States Fish 

 Commission. 



This fine shell is well distinguished from C. rugosa, as Heilprin has shown. 

 The recent specimens found are all young or adolescent, but agree well with 

 the fossil individuals of the same size. 



Cytherea (Artena) glyptoconcha n. sp. 



PLATE 55, FIGURE 24, 

 Cytherea staminea Heilprin, Trans. Wagner Inst., i., p. 116, 1887; not of Conrad, 1839. 



Oligocene of the silex beds at Ballast Point, Tampa Bay, Florida ; Willcox, 

 Burns, and Dall. 



Shell variable in form from short to rather produced, trigonal with the 

 posterior slope longer and the posterior end subrostrate; beaks (normally) 

 pointed, moderately high, subcentral ; lunule cordate, striated, impressed ; an- 



