385 BULIvETlN 5 115 



cells disposed spirally as in the Nui)i}niilite, but its longitudinal section 

 displays only deep grooves. The shell was therefore composed of tubes or 

 syphons, placed parallel to each other, and revolving laterally as in the 

 genus Melon is of Lamarck, with which its characters undovibtedly cor- 

 respond. But as in the transverse fracture, its spiral system of tubes 

 cannot be traced to the centre in any of the numerous specimens we 

 have examined, it would seem to have a solid axis, and consequently belongs 

 to that division of the genus, that Montfort regards as distinct, under the 

 name of Miliolites, which seems to be similar to the Fasciolites of Parkin- 

 son, and altogether different from the Miliolites of Lamarck. Our speci- 

 mens are conspictiously striated on the exterior, which distinction, toge- 

 ther with their elongated fusiform shape, sufficiently distinguish them as a 

 species from the sahulosus, which Montfort describes as the type of his genus. 

 No aperture is discoverable in this shell, but the termination of the exte- 

 rior volution, very much resemblds an apertiure as long as the shell. 



The length is three-tenths of an inch. And its greatest breadth, one- 

 twelfth. 



We call it Miliolites secalicns. Say. Mr. T. Nutall informs me, that 

 he oserved it in great quantities high up the Missouri. 



In the same mass were some segments of the Encrinus, and a Terebra- 

 tula with five or six obtuse longitudinal waves. 



30. Another petrifaction, abundant in some fragments of compact carbon- 

 ate of lime, also found on the shores of the Missouri, possesses all the generic 

 characters, which we have attributed to the preceding species, excepting 

 that in the transverse fractm-e, the cells distinctly revolve from the cen- 



\_Foot note, page i§2\ . 

 tre itself, and of course the shell was destitute of the solid nucleus as in 

 Melonis. Lamarck. It has about four volutions. We have named this 

 species, which is, notwithstanding the difference of the central portion, of 

 the same genus with the preceding, Miliolites centralis. Say. As in the 

 preceding, it is entirely filled solidly with carbonate of lime, and this 

 substance being of a greater purity in the filled up cavities of the fossil, 

 than in the mass, its interior divisions are very obvious. 



The latter species, we observed about one hundred miles up the Kon- 

 zas river, where it forms the chief body of the rocks in extensive ranges. 

 It seems to be a carbonate of lime containing iron. 



[Long's Expedition to the Rocky Mountains, Vol. I, 1823]. 



