372 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



edly in size and shape and other particulars, but the differences are 

 those of degree only, and as far as our present knowledge extends, 

 the species may all be considered as belonging to the same genus. 



During our many trips along the Calvert Cliffs, we found between 

 tides several pieces of bones evidently belonging to turtles. They 

 were all heavy and black. One piece appeared to be the central 

 portion (about half) of a scapula, and on comparison with a scapula 

 of D. coriacea would seem to belong to P. calverten^is. It differed 

 from the same part in D. conacea in being slenderer and flatter. The 

 piece, 6| inches (165 mm.) long, appears to indicate that the scapula 

 is shorter than that of D. coriacea. 



The following is a list of species which have been referred to 

 Psefliofhorus : 



PSEPHOPHORUS POLYGONUS Von Meyer. 



rsephophorus polygonus Von Meyer, N. Jahrbuch, 1846, p. 472, and 1847, p. 



579; Ber. Mit. Freund. Naturw., 1851, p. 3. — Von Hauer, Verb. k.-k. 



geol. Reichsanst., 1868, p. 387, and 1870, p. 342 ; Fuchs, Verb. k.-k. geol. 



Reichsanst., 1874, p. 220. — Seeley, Quart. Journ. Geol. Soc. London, 36, 



1880, p. 406, pi. 15. — Woodward, Proc. Geol. Ass. Loudon, 11, 1889, p. 13. 

 Piscphophorus] /K>///(/o/i».s-, Dollo, Ann. Soc. Sci. Bruxelles, 11, 1887, p. 139; 



Bull. Mns. Roy. Hist. Nat. Belg., 5, No. 1, 1888, p. 83. 



The type-species, known only from a few bones and many scutes, 

 from near Neudorfl, Austria, in Pliocene sandstone. Specimen, in- 

 cluding the type material, now in the museum of the Imperial Geo- 

 logical Survey, Vienna. The slab of hard sandstone in which the 

 remains are preserved is 400 mm. by 410 mm. Avide. 



PSEPHOPHORUS PESUDOSTRACION (Gervais). 



Sphargis pscudosfyacion (Jervais, Diet. Univ. Hist. Nat. (Cb. d'Orbigny), 



11, 1848, p. 56; Zool. et Pal. Frang., 2d ed., 1859, p. 438, pi. 9. tig. 1. 

 P[sephophorus] (Sphargis) pseudostracion, Dollo. Bull. Mus. Roy. Hist. 

 Nat. Belg., 5, No. 1, 1888, p. 83. 

 Type-locality, Vendargues, near Montpellier (Herault). France. 

 Miocene. First considered to be a fish, Osfranon sp. 



PSEPHOPHORUS RUPELIENSIS (Van Beneden). 



Sphargis rupeliensis Van Beneden, Bull. Acad. Roy. Belg., 3d ser., 6, (1883), 

 p. 665. — Woodward, Proc. Geol. Ass. London. 11, 1889, p. 13. 



P[scphophorus^ (Sphargis) ruprliciisis Dollo. Bull. Roy. Hist. Nat. Belg.. 

 5, No. 1, 1888, p. 83. 



Type-locality, Boom, Belgium. Middle Oligocene, 



PSEPHOPHORUS SCALDII (Van Beneden). 



Macrochchjs scnidii Van Beneden, Bull. Acad. Roy. Belg., 2d ser., 31. 1871. 



p. 13.— Dollo, Bull. Mus. Roy. Hist. Nat. Belg., 5, No. 1. 1888, p. 75. 

 P[S€phophorus^ (Macrochcliis) smUUi, Dollo, Bull. Mus. Roy. Hist. Nat. 



Belg., 5, No. 1, 1888, p. 83. 



Type-locality, Antwerp, Belgium. Pliocene and Miocene. 



