92 PHYLOGENY OF FUSUS AND ITS ALLIES. 



Mexico, between Tampa and Tortugas, 27 fathoms on sand (Nat. Mus. 



93651)- 



HEILPRINIA BURNSII (Dall). 



1890. Fusus burnsii Dall, Tert. Moll. Fla., pt. i, p. 126. 



This species has the H. exilis type of whorl and sculpture, but is 

 longer and more slender. The bicarination of the early whorls is 

 marked. The shoulder is not so concave as in H. exilis, but the spirals 

 and method of intercalation are similar. The fifth or sixth whorl of 

 H. exilis has in general the character of the second to the fifth whorls 

 of H. bunisii. 



Locality: Petersburg, Va. (Nat. Mus. 97492). 



Horizon: Miocene. 



HEILPRINIA BARBARENSIS (Trask). 

 1855. Fusus barbarciisis Trask, Proc. Cal. Acad. Nat. Sci., vol. I, p. 41. 

 1903. Fusus barbarensis Trask, Arnold, Pal. and Strat. San Pedro, Cal., p. 224, 



pl. IV, fig. IS. 



The protoconch of this species is worn in nearly all the specimens 

 seen, but in one the sculpture of H. caloosacnsis was noted. The rib- 

 lets on the final portion of the protoconch merge into the ribs of the 

 conch. 



The conch shows three strong central spirals, the lower of which 

 is just above the suture. Intercalated spirals appear on the fourth 

 whorl of the conch. The angulation of the whorls is never very pro- 

 nounced, and the canal is slightly deflected. In many individuals the 

 last whorl or two are ribless. 



This species agrees very closely with H. burnsii, which is slightly 

 more angular, with thicker ribs and stronger central spirals. The 

 intimate relation of these two can not be questioned. 



Localities: Dead Man's Island, San Pedro; also various localities 

 along the west coast of America (Nat. Mus. 124746) ; Santa Barbara 

 (Trask). 

 Horizon: Pliocene. 



HEILPRINIA ROBUSTA (Trask). 

 1855. Fusus robustiis Trask, Proc. Cal. Acad. Nat. Sci., vol. I, p. 41. 

 1903. Fusus robustus Trask, Arnold, Pal. and Strat. San Pedro, Cal., p. 226. 



This species is like the preceding when young, but has a more flat- 

 tened shoulder and more bulging whorls in the adult. The specimens 

 are shorter and not so slender. It is clearly a descendant of the pre- 

 ceding species. 



Locality: Fossil— San Pedro (Nat. Mus.) ; Recent— Santa Barbara, 

 California (Nat. Mus. 7157, E. Jewett, 32399, Stearns coll.) ; Catalina 

 Island (Nat. Mus. 32340, Stearns coll.). 



Horizon: Pliocene to Recent. 



Fusus rugosus Trask (Arnold), p. 226, pl. IV, fig. 7) appears to 

 belong here. 



