PHYLOGENY OF FUSUS AND ITS ALLIES. 



133 



Locality: Bald mound, nine miles southeast of Jevvett, Leon Co., 

 Texas (Acad. Sci. 9409). 



Horizon: Eocene, Lower Claibornian. 



CLAVILITHtS (?) SALEBROSUS (Conrad). 



1834. Fiisus salebrosus Conrad, Journ. Acad. Nat. Sci., vol. 7, p. 145. 



1835. fusus salebrosus Conrad, Foss. Shells Tert. Form. N. Am., p. 55, pi. 18, 



fig. 13- 

 1835. Fusus protcxtus Conrad, ibid., p. 54, pi. 18, fig. 7. 

 1866. Fusispira protexta and salebrosa Conrad, Check list, p. 19. 

 1890. Fusus (Fusispira) protcxtus and salebrosus Gregorio, Ann. de Geol. et 



Pal., Liv. 7, p. 90. 

 1893. Clavilithes protcxtus Cossmann, ibid., Liv. 12, p. ;i6. 



Conrad's F. protcxtus is the adult of his F. salebrosus. The ribs of 

 the early whorls are chicHy restricted to the peripheral portion, the 

 shoulder being' flat or slightly concave and riblcss. Spirals persist 

 throughout. The last whorl or more is entirely ribless but with a pro- 

 nounced concavity on the shoulder. There is no sutural shelf. 



It is not unlikely that this species belongs to another series (Fusi- 

 spira Conrad ) . 



Locality: Claiborne, Alabama (Conrad). 



Horizon: Eocene, Claibornian. 



The following table shows the biologic equivalency of the various 

 species here described under the generic designation of Clavilithes. 

 The structural equivalents, i. e., those in the same stage of development 

 are placed upon the same line : 



6. C. longccvus. 6. C. scalaris. 

 5a. C. solandcri. 1 



6 C. chamber- 

 lain i. 



5a. C. macro- 

 spira. 



S- C. siibscalaris 5. C". maxim us. 5. C. texa- 



i nus. 



4fl. C. tuber- 

 culosus. 



4. C. parisiciisis. — 4. C. parisieitsis. - - 

 var. 



2a. C. cgre- 

 gius. 



4 C. humero- 4. C. sp. 

 sus. ' 



3(7. C. vicks- 

 burgcitsis. 



3 C. conjunc- 3. C. conjunctus 3 C. pachy- 3 C. rapliau- 3 C. /ccnneciy- 



toides. leurus. aides. niius. 



2. C. dameriaccnsis. 



I. C. rugosus. 

 The dotted lines indicate doubtful relationship. 



