between them are too close to admit of their separation into two species. 

 The outer lip of the shell represented on plate 15 is broken, but its 

 contour is plainly indicated by the lines of growth. Besides the 

 distant, oblique, but nearly transverse ribs, the surface of the body 

 whorl is finely striated across, and under the lens each of the strise is 

 seen to be curved concavely backwards near the suture bo as to form a 

 broad, shallow sinus. In the middle or a little above the middle of the 

 last whorl, the strise arch gently forwards, and below this they gradually 

 straighten until they reach the base. Mr. Gabb makes no mention of 

 these striae of growth in his description of S. raricostata, and they are 

 not represented in his figures of the species, so that it is to be presumed 

 that they can only be seen in well preserved specimens. The minute 

 curved lines of growth, and more especially the shallow sinus of the outer 

 lip, appear to be the only characters by which this shell can be discri- 

 minated from the Fusus Renauxianus of the " Paleontologie Francaise," 

 and these may not have been visible on D'Orbigny's specimens, which are 

 not always as perfect as the figures might lead one to suppose. 



FULGUEARIA NaVARROENSIS, ShUMARD. (Sp.) 

 Plate 15, figures 3, 3a. 



Volutilithes Navarroensis, Shumard.— Proc. Bost. Nat. Hist. Soc, 1861, Vol. VIII, p. 192. 

 " « Gabb.— Pal. Cal., Vol. I, p. 102, pi. 19, fig. 56. 



Fulguraria Navarroensis, Stoliczka. — Gastr. Cret. Rocks of S. India, p. 86. 



? = Fulguraria elongata, D Orb. sp. — Compare especially Stoliczka's descriptions and 



figures of that species in the Paleontologia 

 Indica, Vol. II., p. 87-89, pi. 7. 



Middle Shales, Division D., of the west side of Hornby Island, one frag- 

 ment ; Lower Shales, Division B, at Blunden Point, (one) ; and Brown's 

 River, V. I., (two) ; Pioductive Coal Measures, or Division A, of the 

 Sucia Islands, ten large, well preserved and tolerably perfect examples ; 

 J. Eichardson, 1871-'74. 



The Texan and Californian types of V. Navarroensis, described by 

 Shumard and Gabb, appear to have been either young shells which had 

 not yet begun to form the thickened outer lip and columellar callus, or 

 else imperfect individuals in which those parts of the shell had been 

 broken off; The Sucia Island Volutes, on the other hand, which clearly 

 belong to the same species, are nearly all adult specimens, with com- 

 paratively thick tests, and with the mouth characters fully developed. 

 Their outer lip is much thickened, though it can scarcely be said to be 



