90 TRANSACTIONS OF THE WAGNER FREE 



Cerithinm ornatissimnm, nov. sp. Fig. 18. 



Shell acuminate, gracefully tapering ; whorls numerous, fifteen or 

 more, furrowed below the suture, and rugated with a very elaborate or- 

 namentation ; the upper seven or eight whorls of the spire distinctly 

 plicated (longitudinally), the plications on the lower whorls becoming obso- 

 lete, and replaced by broken nodes, which are disposed in a double series 

 one row above the sub-sutural furrow, the other immediately below it 

 the nodes of the two series at first opposite, then alternate ; the lower por- 

 tions of the whorls granulated ; body-whorl with four distinct lines of 

 granulations, the basal one, which is separated by an interval from the 

 others and followed by three elevated, non-granulated lines, the strongest ; 

 entire surface of the shell covered with fine revolving lines, which alter- 

 nate in size ; aperture about one-fifth the length of shell, gently arcuate. 



Length, somewhat above two inches ; width, a half-inch. 



A solitary specimen from the banks below Fort Thompson. 



This species can be readily distinguished by its form and ornamenta- 

 tion from the recent C. atratum and C. cburncuiii, to both of which it bears 

 a general resemblance. 



LAMELLIBRANCHIATA. 



Panopsea Menardi, Deshayes. Fig. 19. 



Diet. Class. d'Hist. Nat., xiii, p. 22. 

 Panoptsa faujasi (auct.). 



Several large specimens from the banks .below Fort Thompson, with 

 the valves still attached. 



I can find no characters by which to separate the Florida fossil from 

 the well-known species of the European Miocene and Pliocene formations. 

 It is almost without doubt the species figured and described by Say as 

 Panopcea reflexa (Journ. Acad. Nat. Sciences Phila., vol. 4, p. 153, pi. xiii, 

 fig. 4), which is stated to have the "shell transversely oblong-subovate; 

 anterior margin somewhat narrower and longer than the posterior mar- 

 gin, the edge reflected ; surface wrinkled, and profoundly so towards the 

 base. Length, three inches and two-fifths; breadth, five inches and seven- 

 tenths," In the above description posterior [margin] should stand for an- 

 terior and vice versa ; height for length and length for breadth. I have 

 not seen any specimens from the American Miocene deposits which corre- 

 spond with Say's figures. The form that has been identified with it by 

 Conrad of which the collections of the Academy possess numerous 

 specimens and which has been generally accepted as Say's species, is a 

 very different shell, easily recognized by its declining posterior slope, the 

 position of the umbones, which are almost invariably placed nearer the pos- 

 terior border than the anterior, and the acute angulation and narrowness of 



