86 PHYLOGENY OF FUSUS AND ITS ALLIES. 



tomoid ancestor. If this is true, this species can not be referred 

 to Falsifusus, but must be placed in a new genus. 



FULGUROFUSUS gen. nov. 



This is another of the pseudo-forms of Fitsiis, in 

 which the outHne and general characters are those of 

 Fitsits while the protoconch and early whorls are dis- 

 tinct. The protoconch is obliquely erect as in Fiilgur 

 and in Levifnsus (?) harrisi Grabau from the lower 

 Claiborne of Texas. (See Plate XVII, figs. 5, 6.) It 

 does not end in a ribbed portion as in Ftisits, but after 

 barely one volution an angulation appears near the 

 middle and with it a basal carina. This type of proto- 

 FiG. 9. Ful- conch is identical with that of Plcnrotoma diinitiata 

 gurofusus quer- Brocchi and P. coqiiandi Bellardi, both of which are 

 CO IS. ^ (, er fj-Qj-,^ ^\yQ Italian Pliocene. 



Genotype: Fnsiis quercollis Harris. 



Harris.) 



FULGUROFUSUS QUERCOLLIS (Harris). 



(Plate XVII, fig. 6.) 



1896. Fusus quercollis Harris, Bull. Am. Pal, vol. I, p. 200, pi. 18, fig. 9 (see 



fig- 9)- 



This species is well described by Harris and it is only necessary to 



add the following note to his description. 



The protoconch is Fulguroid, consisting of one whorl which is 

 smooth, obliquely erect and with a prominent apex. 



The conch is not distinctly separated from the protoconch, and is 

 very early marked by an angulation and a basal carina; i. e., a strong 

 spiral which appears just above the suture. The angulation is pro- 

 duced by two spirals which are crossed by vertically oblique semilunar 

 riblets. The peripheral spirals are close together and at first equal, 

 but later the upper one becomes more prominent and develops finally 

 into the strong noduled keel so characteristic of the species. The 

 lower spiral becomes fainter, and two others appear below it. None 

 occur on the shoulder. 



Locality: Graveyard Hill, Wilcox County, Alabama (Acad. Sci. 

 9019) ; Matthews' Landing, Alabama (Acad. Sci. 8524). 



Horizon: Lower Eocene. 



FULGUROFUSUS RUGATUS (Aldrich). 



1886. Fusus rugatus Aldrich, Bull. I Geol. Surv. Alabama, p. 22, pi. 5, fig. 9. 

 1896. Fusus 7'ugatus Harris, Proc. Acad. Nat. Sci. Phil., p. 478, pi. 22, fig. 8. 

 1899. Fusus rugatus Harris, Bull. Am. Pal., vol. 3, p. 43, pi. 5, fig. 6 (see fig. 10). 



This species has precisely the same type of protoconch as the pre- 

 ceding, but with the beginning of the conch only one spiral appears, 



