130 PHYLOGENY OF FUSUS AND ITS ALLIES. 



when the shelf is completely developed. The shelf generally slopes 

 inward more as in C. solanderi of the British series. 



Localities: Jackson, Miss. (Acad. Sci. 6884, Conrad's types) (M. 

 C. Z. 27792) (Nat. Mus. 14707) ; Mount Lebanon, La. (Acad. Sci. 

 6887, Nat. Mus, 1473 18, 1473 16) ; Montgomery, La. (Acad. Sci. 

 6886) ; St. Maurice, La. var. (Acad. Sci. 6885). 



Horizon: Jackson stage. Eocene (var. Claiborne stage). 



Note: The last-mentioned variety has less impressed sutures between 

 the whorls, and the shelf appears early, the conjiinctus stage being 

 much condensed or almost eliminated. The convexity of the whorls 

 is suppressed, so that the sides appear almost straight, though converg- 

 ing upwards. The shelf is narrow and regular. The ribs of the neanic 

 stage are narrower, more uniform and less bulging. The protoconch 

 is of the usual type. The other Louisiana specimens form connecting 

 links, and together these forms lead to the Texan variety next described. 



CLAVILITHES TEXANUS Harris. 



1896. Clavilithes humerosus var. texaniis Harris, Proc. Phil. Acad. Nat. Sci., 



1895, P- 72>, pl- 7, t^g- 7- 



This species is a parallel to the Parisian C. subscalaris, i. e., it is in 

 the same state of development. As in the other species of this series, 

 the first whorl of the protoconch is abruptly compressed and somewhat 

 elevated so as to produce a strong projecting point. The other whorls 

 are round. 



The neanic whorls of the conch are similar to those of the variety 

 from St. Maurice, La. In the later whorls the spirals become subdued. 

 The shelf appears early and a slight depression forms below it, recalling 

 the deep concavity characteristic of C chamberlaini Johnson and Grabau. 



Locality: Alabama Bluff, Trinity River, Houston Co., Texas (Acad. 

 Sci. 6889) ; Claiborne, Alabama (Nat. Mus. 2916). 



Horizon: Eocene (Claibornian). 



CLAVILITHES RAPHANOIDES (Conrad). 



1834. Fusus raphanoidcs Conrad, Journ. Acad. Nat. Sci., vol. 7, p. 144. 



1835. Fusus raphanoidcs Conrad, Foss. Shells Tert. Form. N. Am., p. 54, pl. 18, 

 fig. 8. 



1890. Fusus (Clavella) raphanoides Gregorio, Ann. de Geol. et de Pal., Liv. 7) 



p. 89. 

 1893. Clavilithes raphanoides Cossmann, ibid., Liv. 12, p. 2>^. 



"Fusiform, entire; whorls slightly contracted above; suture pro- 

 found; margined by an obsolete raised line; body whorl abruptly 

 rounded inferiorly ; aperture suddenly contracted above and beneath" 

 (Conrad). 



This species recalls C. egregius from the North German Oligocene 

 in its final whorls. Spirals seem to be absent altogether from this 

 species. 



