( 41 ) Claiborne Fossils 41 



sedgewickii Lea 



Nnada sedg;etvickii Lea, Cont. to Geol., Dec, 1S33, p. 79, pi. 3, 



fig. 58. 

 Syn. of Nucula magnifica Con. 



sellseformis Con. 

 Ostrea sellcBforinisQ.o\\., Foss. Sh. Tert. Form., 1832, p. 27, pi. 13. 

 O. radians Con., ibid., p. 27, pi. 13, fig. i. 



It is very doubtful whether a specimen of this species has ever 

 been found in the Claiborne sand. A very closely related 

 form, O. divaricata, is occasionall}^ met with here and above 

 but sellcEformis seems to be more particularly a Lower Clai- 

 borne form. It is particularly^ abundant in the calcareous lay- 

 ers from 10 to 60 feet beneath the sand bed. 



semen Lea 



Marginella semen Lea, Cont. to Geol., 1833, p. 178, pi. 6, f. 190. 



semen Lea 

 Nuada senien'Li&Q., Cont. to Geol., 1833, p. 200, pi. 6, f. 214. 



semilunata Lea 

 Natica se7nihmatal^QQ., Cont. to Geol., Dec, 1S33, p. 108, pi. 4, 



fig- 93- 



semiltmata Lea 



Ostrea semilunata \^^2l, Cont. to Geol., Dec, 1833, p. 90, pi. 3, 

 fig. 69. 

 Syn. of O. alabaviiensis , which see. 



septemnarius Con. 

 Murex septemnarins Con., Jr. Ac. Nat. Sci., vol. 7, 1S34, p. 154. 

 Type ? 



sessilis Con. 

 Scalaria sessilis Con., Foss. Sh. Tert. Form., Nov., 1833, p. 45. 

 S.plamdata\,Q.'&., Cont. to Geol., Dec, 1833, p. 115, pi. 4, fig. 



102. 

 kS. veniista H. C. Lea, Amer. Jr. Sci., vol. 40, 1840, p. 95, pi. i, 



fig- 7- 



sexangiilus Con. 

 Fusus sexangidus Con., Jr. Acad. Nat. Sci., vol. 7, 1834, p. 144. 

 Type ? 

 Syn. of Murex engonahis fide Con. 



sillimani Con. 

 Tellina sillimani Q.OU. , Anier. Jr. Sci., vol. i, i§46, p. 399. pi. 4, 

 fig. 9. 



