New Species of Palaeozoic Fossils. 191 



This species resembles Nucula parva McChesnej, from the coal 

 measures. 



Formation and locality. In the upper beds of the Limestone, 

 near Louisville, Ky. Cabinet of Dr. James Knapp. 



l^UCULA NEDA n. Sp. 



Shell rhomboid-ovate, cuneate, with the umbones veutricose ; the 

 beak a little more than one-third from the anterior end, prominent 

 and incurved ; cardinal margin sloping to the anterior and posterior 

 extremities ; basal margin broadly rounded. 



The cast shows strong anterior and posterior muscular impres- 

 sions, with three or four umbonal muscular scars ; a narrow pedal 

 scar just within the cardinal line anterior to the posterior muscular 

 area, as usual in the genus. 



The number of teeth cannot be determined, but there are as many 

 as six or eight on the posterior side, with a distinct ligamentaL cavity 

 in the cast beneath the beak. 



The surface has been marked by fine concentric strise. 



This species is of the size, and similar in aspect, to ,the Nucula 

 levata of the lower Silurian rocks, and differs but little from Nucula 

 hillastriata of Conrad, which is a large species from the Hamilton 

 group of JSTew York. 



Formation and locality. In the '^ Hydraulic beds" near Louis- 

 ville, Ky. From. the cabinet of Dr. James Knapp. 



Tellinomya subnasuta n. sp. 



Shell unequally ovate, twice as long as high, with very ventricose 

 valves, giving a subcylindrical form anterior to the beaks ; posterior 

 end very narrow, pointed at the extremity ; anterior end broadly 

 rounded, longest above the center; basal line very slightly sinuate 

 opposite the small appressed beaks which are situated at two-thirds 

 the entire length from the anterior extremity. Muscular impressions 

 of moderate size, distinctly marked, situated near the margins of the 

 valve; pallial line entire, composed of a series of radiating pustules, 

 as seen on the cast. Crenulations of the hinge not distinctly seen, 

 but the evidence possessed would indicate them to have been minute. 



Surface marked by distinct, rather strong, somewhat lamellose lines 

 of growth. 



The characters of this shell and several similar ones have not been 

 fully determined. The external form is very like some species of 

 TELLiNOi^rrA, but the condition of the hinge is such that no satisfac- 

 tory determination can be made at the present time, though we have 



