TRANSACTIONS OF WAGNER 

 1404 



TERTIARY FAUNA OF FLORIDA 



Astarte (Ashtarotha) cuneiformis Conrad. 

 Astarte cuneiformis Conrad, Fos. Medial Tert, p. 42, pi. xx., fig. 9, 1840; Proc. Acad. 



Nat. Sci. Phila., xiv., p. 578, 1863 ; Meek, Checkl. Inv. Fos. Miocene, p. 7, 1864. 

 Astarte varians Conrad, Proc. Acad. Nat. Sci. Phila., i., p. 29, 1841 ; Journ. Acad. Nat. 



Sci. Phila., viii., p. 184, 1842 ; Bull. Nat'l Inst. No. 2, p. 181, 1842 ; Fos. Medial Tert., 



p. 67, pi. xxxvii., fig. 7, 1845 ; Proc. Acad. Nat. Sci. Phila., xiv., p. 578, 1863 ; Meek, 



Checkl. Inv. Fos. Miocene, p. 7, 1864. 

 f Astarte planulata Conrad, Bull. Nat. Inst., ii., p. 187, 1842 ; Proc. Acad. Nat. Sci. Phila., 



p. 578, 1863; Meek, Checkl. Inv. Fos. Miocene, p. 7, 1864 (a nude name, nowhere 



defined). 



Miocene of Plum. Point, Maryland, upper and lower layers, and various 

 localities within a mile of Plum Point. 



More elongated and inequilateral than the A. perplana and with a shorter 

 lunule. The sculpture is very variable, the type has the umbones rippled and 

 the remainder of the disk smooth and rather flat ; the variety obesa Dall is 

 thicker and more convex, with the umbones not flattened and the whole surface 

 perfectly smooth; the variety calvertensis Glenn is compressed like the type, 

 but finely concentrically striated all over. 



The Pliocene, being an epoch of relatively high sea temperature in which 

 the subtropical fauna made inroads on the territory previously occupied by the 

 cooler-water Miocene, has few Astartes and they are of small or deep-water 

 types. 



I Astarte meridionalis Gabb. 

 Astarte meridionalis Gabb, Journ. Acad. Nat. Sci. Phila., 2d Ser., viii., p. 376, pi. xlvii., 



fig. 78, 1881. 



Pliocene clays of Limon, Costa Rica, Gabb. 



Three millimetres long, concentrically ribbed, trigonal, and pointed behind. 



Astarte opulentora n. sp. 

 PLATE 57, FIGURE n. 



Pliocene clays of the Tehuantepec Railway, seventy and one hundred and 

 twenty-four kilometres west of Atlantic terminus ; J. W. Spencer. 



Shell small, rounded, wide and rounded behind, shorter and more pointed 

 in front ; beaks small, low, usually eroded ; lunule short, lanceolate, slightly 

 impressed ; escutcheon longer, narrow, bordered by a low keel externally ; 

 valves moderately convex, rounded below, sculptured with small, subequal, 

 low, concentric ribs and channels, which are less distinct near the posterior 

 margin ; hinge normal ; hinge-plate narrow, inner margins sharply crenu- 

 lated. Height 10.0, length 12.5, diameter 6.5 mm. 



