TRANSACTIONS OF WAGNER 

 734 



TERTIARY FAUNA OF FLORIDA 



the ribs faintly grooved distally on top; the concentric sculpture sometimes 

 strong on three or more ribs and almost absent on the intervening ones; 

 hinge-line wide, ears large, with conspicuous but not deep notch, with six or 

 seven coarsely imbricated, close-set radial threads on the byssal ear and more 

 numerous threads on the others ; submargins nearly smooth ; cardinal crura 

 strong ; inner basal margin with strong, short flutings, obsolete above. Alt. 

 25, lat. 25, length of hinge-line 18 mm. 



Pecten (.^quipecten) su'waneensis n. s. 



Vicksburgian of Suwanee County, Florida ; Johnson. 



Shell with twenty-two entire, rounded ribs, with narrower, rather shallow 

 interspaces crossed by little raised, concentric, not crowded, more or less fluc- 

 tuated laminae continuous over ribs and spaces, with lateral grooves on the 

 ribs near the basal margin ; submargins narrow, smooth ; ears subequal, 

 moderate, with fine, close, concentric sculpture and four or five distant fine 

 imbricated radii ; notch distinct, rather deep. Alt. 20, lat. 20 mm. 



This form differs from P. Knciskcrni by its unchannelled interspaces, con- 

 tinuous concentric lamellae, and subequal ears ; from P. cliipolaniis by feebler 

 and more numerous ribs, shorter ears, and less conspicuous sculpture. It is 

 flatter, thinner, and smaller than the weakest specimens of P. pcrplamts, and 

 while its characters are not marked, does not seem to be unliable with any of 

 the others of its section. P. nuperus, which is the nearest to it among the 

 species of CJilamys, has a more solid shell, more sharply keeled ribs, and 

 differently sculptured ears, while its form is decidedly more ovoid. 



Pecten (.ffiquipecten) glyptus Verrill. 

 Pecten glyptus\&xx\\\, Trans. Conn. Acad., v., p. 580, 1882; Dall, Proc. U.S. Nat. Miis., 



xii., p. 248, pi. 8, figs. 2 and 3, 1889. 

 Pecten Try onz DaW, Bull. Mus. Comp. Zool., xviii., p. 438, 1887. 

 Chlamys (^•Equipectcn') glypta Verrill, Trans. Conn. Acad., .x., p. 76, 1897 ; in part. 



This species is cited here as the only true living representative on our 

 coast of the section Aiquipcctcn, and it is rather more inequilateral than 

 typical species of that group. It has been found from the vicinity of Cape 

 Hatteras to the continental bench off Martha's Vineyard. Professor Verrill's 

 specimens were very imperfect, and some worn fragments of another species, 

 P. phrygiitm Dall, were confused with those belonging to P. glyptus in Pro- 

 fessor Verrill's cited paper. Of his figures on plate xvi., 7, 10, and per- 



