CRETACEOUS FOSSILS. 145 



presence of the faint undulated ribs on the larger limbs, and in the presence of the 

 well-marked internal ribs. Unfortunately no septum was detected in the Indian 

 species, and we cannot be absolutely certain of their specific difference, since the 

 characters on which the two forms are separated, are among those which are most 

 subject to variation. 



BACULITES, Lam. 



B. occidentalis, Meek. 



(B. ovatus ? Meek (not Say), Trans. Albany Inst., Vol. 4, p. 48.) 



(jB. occidentalis, Meek; loc. cit., p. 49.) 



(B. sp. indet, Gabb ; Pal. Cal., Vol. 1, p. 81, pi. 17, fig. 28, 28 a; pi. 14, fig. 28 b.) 



As yet, only known from Vancouver Island, whence Mr. Meek obtained speci- 

 mens, which he referred doubtfully to Say's species, pointing out some differences 

 and suggesting the above name, should these differences prove constant. More 

 recently in his enumeration of the Cretaceous fossils, in the Proceedings of the 

 Philadelphia Academy, and in the Smithsonian Check List, he has elevated the 

 form to the rank of a distinct species, in which I follow him. 



GASTEROPODA. 



FUSUS, Lam. 



F. TUMIDUS, n. s, 

 PI. 26, Pig. 22, 



Shell elongated fusiform, thick; spire elevated, whorls six or 

 seven, sides swollen, outline sinuous ; body whorl concavely slop- 

 ing above, tumid in the middle, narrowed in advance. Aperture 

 broad above, narrow below, canal produced ; outer lip simple (?), 

 inner lip slightly incrusted. Surface marked by about ten short 

 broad longitudinal ribs or undulations on the middle of the 

 whorl, crossed by numerous revolving linear ribs. 



PAL. VOL. II. — 20 



