364 DESCRIPTIONS OF NEW SPECIES OF FOSSILS 



SILIQUARIA, Brug., not Schum. 

 (Agathirses, Montf., Tenagoda, Auot.) 

 S. SCULPTURATA, n. s., PI. 46, fig. 59ffl. 



Shell large, beginning in a loose, irregular spiral, until it acquires a diameter 

 of about one inch, when it runs off in a much more open and direct spiral, several 

 inches in length, and somewhat over an inch in diameter. Surface marked by 

 numerous, closely placed, longitudinal ribs, crossed by lines of growth, some of 

 which rise as sub-squamose plates on crossing the longitudinal ribs, giving the en- 

 tire surface the roughened appearance of a rasp. This is most marked on the 

 under side. Cross section circular ; aperture elongate, the sides sloping upwards 

 and backwards to the superior slit, the lower margin of the lip produced and thin. 

 The two species nearest to this are the recent <§. centiquadrata, marked by 

 about the same number of longitudinal ribs, but entirely wanting the rasp-like 

 cross sculpture, and the Eocene species, described by Mr. Lea under the name of 

 S. Claibornensis, from Alabama, which is smaller, more regular in its juvenile mode 

 of growth, and entirely different in style of ornament. 



As is the case with many, if not all of the Ve7-metid(S, as this species increased 

 in size, the animal withdrew itself from the older parts of the tube, closing the 

 slit by a deposit of shell matter on the inside, and building one septum after 

 another at irregular distances. 



GENUS INDET. 



Two fragments of irregularly contorted tubes, each nearly an inch long ; not 

 referable to either of the preceding species. 



XYLOPHORA, Fisch. 

 X. AGGLUTiNANS, Lam., sp. 

 Trochus id., Lam., A. S. V., 1 Ed., v. 1, p. 558. 



Not common. 



HIPPONYX, Defr. 

 ? H. CREPiDL'LA, Gabb, n. s., PI. 46, fig. 60. 



A little compressed, curved, and equilateral shell, which I refer doubtfully to 

 Hipponyx, because I have not been able, with the greatest care, to detect any 

 muscular scar. In the median line is a marked depression, which even shows 

 some traces on the inner surface. The mouth is subquadrate, or rather pentagonal, 

 from the median prolongation. The apex minute and incurved, but without the 

 slightest trace of a spiral. Lines of growth regular, except one or tivo a little 



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