PHYLOGENY OF FUSUS AND ITS ALLIES. 



89 



of this species occurs in the collection of the U. S. National Museum 

 (cat. 97494 pars.). The spire of this specimen is nearly turbinate, the 

 sutures being hardly impressed. A strong vertical ribbon-like border 

 marks the upper portion of the later whorls, and gives the shoulder a 

 very concave aspect. The whole appearance of the shell is like that of 

 some turbinate Pleurotomoids. 



Localities: Caloosahatchie River, Florida (Nat. Mus. 97494) ; Shell 

 Creek, Florida (Nat. Mus. 1 13220) ; Waccamaw River (Wagn. Free 

 Inst.) ; Florida (M. C. Z. 27799). 



Horizon: Pliocene. 



HEILPRINIA CALOOSAENSIS var. CAROLINENSIS (Dall). 



1892. Fusiis caloosa'ciisis var. carolincnsis Dall, Tert. Moll. Fla., pt. 2, p. 234, 

 pi. 14, fig. 4a (see fig. 12). 



1889. Ftisiis caloosacnsis var. carolincnsis Dall, Blake Moll., pi. 29, fig. 4. 



The type specimen of this variety shows an additional very minute 

 half whorl or more on the protoconch, so that altogther there occurs 

 a complete volution without riblcts, but this portion of the protoconch 

 is very small. This is followed by one and one 

 half volutions, which is ribbed as described for 

 the protoconch of H. caloosacnsis. The young 

 conch appears bicarinate because the lower of the 

 three spirals on each whorl is progressively 

 covered by the succeeding whorl. The later 

 whorls become more bulging and a strong sec- 

 ondary spiral appears between the middle and 

 lower of the primary ones, the latter being barely 

 visible above the suture. In some specimens the 

 shoulder is less depressed, sloping flatly upward 

 to the lower of the three spirals of the preceding 

 whorl, resembling in this respect more the normal 

 form. Intercalated spirals in these specimens do 

 not appear until the final whorl. 



This variety is stouter than the normal form 

 of the species, and shows a slight advance upon 

 it in that the ribs become obsolete nuich earlier, 

 nects this species with H. cqiialis. 



Localities: Tilly's Lake, South Carolina (Nat. Mus. 112349); 

 Waccamaw, S. C. (Nat. Mus. 11455) ; Cape Fear (Nat. "Mus. 8695). 



Horizon: Pliocene, Waccamaw beds. 



HEILPRINIA EQUALIS (Emmons). 



1858'. Ftisiis cqiialis Emmons, Geol. Rep. North Carolina, p. 250, fig. iii. 

 1862. Neptunca cqiialis Conrad, Proc. Acad. Nat. Sci. Phil., p. 560. 



1890. Fusus cqualis Dall, Tert. Moll. Fla., pt. I, p. 126. 

 1892. Fusus cqualis Dall, ibid., pt. 2, p. 234, pi. 14, fig. 3b. 



Fig. 12. Heilprinia 

 caloosacnsis var. caro- 

 lincnsis. (After Dall.) 



It apparently con- 



