PAUEONTOLOGICAL REPORT OF GEOLOGICAL SURVEY. 573 



nent on the last than preceding whorls, most decided on the outer 

 edge ; septu along the central third of the periphery slightly curved 

 backwards; regularly curved backwards on the sides; where the shell 

 has been well preserved it is closely covered with fine striae, strongly 

 arched backwards, on the periphery, into tongue shaped markings ; 

 siphuncle medium size ; central or nearly central ; umbilicus open, 

 showing all the whorls ; mouth transverse, subreniform ; vertical 

 height .yVo of an inch; transverse diameter .y^ of an inch; greatest 

 diameter of the shell l.yVff m °hes; depth of septu next to the last 

 chamber . T Vo of an inch. 



This beautifully ornamented Nautilus, differs from the N. tuhercu- 

 latus, Sow., with which it is most nearly related, in not being concave 

 on the sides, as well as in its markings and the outline of its septu. 



Position and locality. It is found crushed in the roof shales of No. 

 9 coal, at the mines of the Kentucky Coal Company, Union county, 

 Kentucky, and in a more perfect state of preservation in the fossilif- 

 erous nodules of calcareous sulphuret of iron in the same shale; 

 which, when thrown out, decompose, from the action of the atmosphere 

 and yield readily their store of fossils to the collector. 



SOLENIMYA SOLENIFORMIS. Cox. 



(PI. IX, fig. 5; natural size.) 



Transversely elongated; inequilateral; beaks not elevated, sloping 

 to the front, about one-third the length from the anterior end ; ex- 

 tremities and base obtusely rounded— more decided anteriorly in 

 young than in adult specimens; cardinal border straight; surface 

 covered with concentric lines and furrows ; length 2. T 7 -g- 4 -g- inches ; width 

 l.-jS/o- inches. 



Position and locality. It is very abundant in the black shale which 

 forms the roof of No. 9 coal, on the property of the Kentucky Coal 

 Company, Union county, Kentucky, and in the same character of 

 shale, over the thirteen inch coal, in the bed of the Ohio river, at the 

 head of French Island. 



PRODUCTUS MURICATUS. Norwood and Pratten. 



PI. IX, fig.. 6; natural size.) 



For description, see Journal Academy Natural Sciences, Aug., 1854, 

 pi. 1, fig. 8. 



