372 
PALEONTOLOGY OF NEW-YORK. 
The following species of Entomostraca have been recognized in this group* : 
Leperditia jowesi (n.s.). 
Plate LXXIX A. Fig. 5 a - e. 
Leperdita (Cytherinct) alta? Palaeontology of New-York, Vol. ii, pa. 331, pi. 78, f. 2. 
Carapace large : valves strongly convex, gibbous in the middle ; an¬ 
terior end narrower, rounded; posterior end broadly and regularly 
rounded ; ventral margin broadly arching and abruptly incurved. The 
dorsal angles are expanded, and a distinct narrow border extends 
thence along the anterior and posterior ends, to where the ventral 
margin begins to curve inwards. The anterior tubercle is distinctly 
prominent, and above a line extended from the central tubercle to the 
anterior dorsal angle. Central tubercle moderately prominent, and 
distinguishable by the reflection of light upon the surface, the greatest 
convexity of the valve being posterior to the middle. Surface papillose. 
In casts, the place of the central tubercle is seen, with the radiating 
vessels distinctly visible in meandering granulose lines extending to¬ 
wards the posterior and ventral margins. 
This species resembles in form the L. alta, and I had not originally separated it 
from that species. It differs, however, in its usually larger size and somewhat greater 
proportional breadth, while the papillose surface of the last is always a reliable 
feature for distinguishing it from that species. In specimens of the same size, it is 
more convex in the middle than L. alta. 
* 
Fig. 5 a, b. A young and medium-sized specimen, natural size. 
Fig. 5 c. A full-grown specimen, natural size. 
Fig. 5 d. Profile view of the same. 
Fig. 5 e. An enlargement of the surface, showing the papillose markings. 
Geological position and locality. In the coralline limestone, Schoharie, and in the 
same position in Herkimer county. 
* The Leperditia jonesi is introduced in this place, to correct the erroneous reference of the species in 
Vol.n. 
