76 EOCENE AND LOWER OLIGOGENE GORAL FAUNAS. 



Localities. — Clalbonie, White's marl lied (Monroe County), Lisbon and 

 Grosport, Alabama; South Carolina;^ Lexington, Lee County, Texas; Bold 

 Mound, 9 miles southeast of Jewett, Texas; 1 mile below Shipps Ford, 

 Bastrop County, Texas; Newton and Wautubbee, Mississippi. Meyer and 

 Aldrich cite Jackson, Mississippi (vide op. sup. cit.). 



Geologic occurrence. — Claibomiau iu general. 



The distinctive characters of this species will be noted after the 

 following: 



Platytrgchus goldfussi (Lea). 



PI, V, figs. 2 to 7. 



1833. Turhinoiia f/olflfiifisii Lea. Gontrib. to Geol., p. 19.5, pi. vi, fig. 208. 

 1838. Turbinoiia goM/Kstiii Michelotti. Spec, zoophyt. dil., p. 57. 

 1848. Turbinoiia goldfussii Bronu. Index pal., p. 1315. 



1818. Plati/trochus gold/iissii Milue-Edwards and Haime. Anuales sci. uat., 3d ser., 

 Vol. IX, p. 21S, pi. vii, tig. 9. 



1850. Plati/trochus gold/ussii d'Orbigiiy. Prodr. de Pal., etage 25, num. 1245. 



1851. Platytrochus [loldfiissii Mllue Edwards and Haime. Polyp, foss. des Terr. Pal., 



p. 29. 

 1857. Platytrochus qoldfussii Milne-Edwards and Haime. Hist. Nat. des Corall., Vol. 



II, p. 72. ■ 

 18G1. Plafi/froclius (joldfussii de Frpmentel. Introd. a I'fitude des Polyp, foss., p. 93. 

 1806. Platiitroclius gold/itssii Gonrad. Check List, p. 2. 

 1890. Platytrochus (/oldfussii de Gregorio. Mon. de la Faune eoccuitpie de I'Ala., p, 



255, pi. xlv, figs, 10-20. 



Shape cuneate, cross section elliptical, base compressed, usuallv rounded, 

 sometimes emarginate. Costae rather wide, granulate, from 24 to 36 iu 

 number. The nine ribs and their derivatives nearest the median portion of 

 the lateral faces are widest in their upper portions, there consisting of about 

 three granules alongside of one another; they converge toward the cen- 

 ter of the base, becoming narrower as they approach it, and near their origin 

 consist of t)nly one njw of granules. The marginal costaj and those stand- 

 ing immediately next are wider, are composed of a large member of gran- 

 ules, and increase iu breadth as the base is approached. The costae next the 

 median eosta of a lateral face sometimes trifurcate.^ The intercostal furrows 

 near the middle of a face are straight; those bordering the marginal costje, 

 and usually those standing next to them (i. e., eight in all, four to each 

 face), are usually curved in such a manner that their termini approach the 



'Specimens in the 5Ju8. of Comp. Zool., Cambridge, Mass. 



-Tlie mode of costal and septal increase is tlie same in Platytrochus as iu Sjihenotrochus (see pp. 



82-84). 



