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ART. X — Descriptions of New Species of Fossils, probably Triassic, from Virginia. 



By Wm. M. Gabb. 



Ceeatites Virgintanus. PI. 48, fig. 27, a, b, c. 



Shell discoidal, compressed; body whorl oval, enveloping one third of the preceding 

 whorl ; siphuncle in advance of the centre ; surface marked by a faint row of tubercles 

 on the ventral side, from each of which proceed two rounded waved ribs extending 

 across the dorsum ; between each pair of these ribs there is an intermediate one, equally 

 prominent on the dorsum, but dying out before reaching the ventral side ; there is 

 also a faint rounded carina on the dorsum; these markings are so indistinct as only 

 to be seen on good specimens; I have a specimen before me showing only the 

 tubercles. Septum ; dorsal lobe longer and narrower than the dorsal saddle, bifur- 

 cated, with three or four tooth-like processes on each side ; inside of the bifurcation 

 plain ; dorsal saddle divided into three rounded processes, the middle a little the 

 largest, (this varies a little at different stages, sometimes the lobes are all of the same 

 size ; this holds good in all the saddles of the same septum) ; superior lateral lobe 

 smaller than the dorsal and divided into three branches, dorsal branch entire, terminal 

 and ventral double; superior lateral saddle like the dorsal, but smaller; lateral 

 lobe trifid, with each of the three branches bidentate ; lateral saddle same as the 

 others, but smaller; inferior lateral lobe nearly straight, but still preserving the trifid 

 character; the remainder of the septum appears to consist of a mere undulation. 



Locality and position. — Bath Co., Va., from a greyish rock, probably a limestone. 

 Collection of the Academy, and my own collection. 



Pleukotomaeia ? PI. 48, fig. 28. 



A cast, too imperfect for description, but still interesting on account of the small 

 number of molluscs found in this formation. 



Locality. — Same as above. Collection of the Academy. 



LEPT.ENA, N. S. 



This small Leptosna I give for the reason given above. It is very imperfect ; the 

 ends of hinge line are broken off, and the specimen is so broken and compressed 

 about the hinge as to show neither hing3 nor aroa. The beak has been small and 



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