PIIYLOGENY OF FUSUS AND ITS ALLIES. 



87 



Fig. 10. Ful- 

 gurofiisiis r u - 

 gatus. ( A 1 d - 

 rich.) 



which is crossed by vertical ribs much after the manner of a young 

 Fulgnr. The ribs produce no(Uiles where they cross the angulations. 

 The adult whorls show a remarkable sinuosity or notch 

 on the periphery, where this is marked with strong 

 spirals. This notch is something over a fourth of an 

 inch in dciMh, l)ut becomes filled up later on and dis- 

 appears as a notch from the margin. When the spine 

 is developed at its maximum the notch extends out- 

 ward from the aperture, but later on as the shell is 

 built forward the notch comes to project backwards in 

 the margin of the shell. This type of spine is precisely 

 that found in adult Fulgnr, such as F. caricnm, and this 

 together with the fulguroid protoconch of the present 

 .species suggests that we have in FiilgitrofiiSKS either the 

 Eocene ancestor of Fulgnr and Sycotypus or a closely 

 related lateral branch from that ancestor. 



The Fusoid form of the species of Fulgurofusus is 

 clearly a case of parallelism and is due to a great ob- 

 liquity of whorls and a loose coiling. It is approached 

 in certain species of Fulgnr. From this same stock was undoubtedly 

 derived the Levifusus series through such connecting form as L. 

 (?) harrisi from the Texas Eocene. 



Localities: Graveyard Hill, Wilcox County, ^Vlabama (Acad. Sci. 

 9018); Gregg's Landing, Alabama (Acad. Sci. 6869). 



Horizon: Eocene. 



14. THE GENUS HEILPRINIA. 

 HEILPRINIA gen. nov. 



This generic name is proposed for a number of recent and late 

 Tertiary Fusoid shells from the Antillean region and Florida. They 

 differ from Fusus in the very remarkable, strongly accelerated proto- 

 conch, which is throughout its greater portion crossed by riblets. 

 (See detailed description under H. caloosavnsis.) The shells are 

 usually close coiled with short spire and bulging whorls. The canal 

 is long and the columella usually furnished with numerous short plica- 

 tions in the adult. 



Genotype: Fusus caloosa'cnsis Heilprin. 



HEILPRINIA CALOOSAENSIS (Heilprin). 



(Plate XVIII, fig. 5; Plate VIII, fig. 21.) 



1887. fusus caloosa'cnsis Heilprin, Trans. Wagn. Free Inst., vol. I, p. 68, pi. I, 



fig. I. 

 1890. Fusus caloosacnsis Dall, Tert. '\lo\\. Fla., pt. i, p. 127. 

 1892. Fusus caloosacnsis Dall, ibid., pt. II, p. 234, pi. 14, fig. 3 (see fig. 11). 



The protoconch in the specimens seen has a small rather pointed 

 end, and is smooth for about a third of a volution. There is, however, 



