152 
PALAEONTOLOGY OF NEW-YORK. 
191. 1. TELLINOMYA NASUTA (n. sp.). 
Pl. XXXIV. Figs. 3 a, b, c. 
Transversely elongated, inequilateral; anterior extremity rounded ; posterior extremity 
greatly extended into a kind of beak, which is narrowed and compressed, contracted on 
the base by a shallow sinus ; umbones prominent, rounded ; shell thin ; surface marked 
by fine concentric lines. The muscular impressions are strongly marked upon the cast, and 
the umbones are more obtusely angular; there is no evidence of teeth or crenulations. 
This shell is readily distinguished by the prolonged posterior extremity, which is obliquely 
truncated and constricted by a sinus on the base. This character is more conspicuous on 
the cast than in the perfect shell; the anterior portion of the shell is more gibbous, and 
regularly rounded at the extremity. 
This is a rare species, the form of which I was at first inclined to regard as accidental; 
but having seen three specimens in which it is constant, there can remain no question of 
its title to a place among the species of this period. 
Fig. 3 a. Eight valve of a specimen on which the shell is preserved. The posterior side of the shell is 
less extended than in the other specimens. 
Fig. 3 b. Similar view of a cast, showing the muscular impressions a a. 
Fig. 3 c. Dorsal view of the same. 
Position and locality. In the dark colored upper portions of the Trenton limestone at 
Middleville, Trenton Falls, &c. 
192. 2. TELLINOMYA SANGUINOLAROIDEA (». sp.). 
Pl. XXXIV. Figs. 4 a, b. 
Inequilateral, transversely extended, compressed, subelliptical, narrowed posteriorly ; 
anterior extremity broadly semi-elliptical; posterior half subcuneate, compressed and acute ; 
umbones (in the cast) moderately prominent, thin, approximate ; cardinal line extended, 
without visible teeth or crenulations ; basal margin regularly curved; shell thin, closely 
marked by fine concentric laminae. 
The only specimen which I have been able to obtain is a cast, and I have seen another 
in the same condition. It is readily distinguished from the last, by being more compressed, 
the umbones less prominent, the front more uniformly and regularly rounded, while the 
posterior extremity is cuneate and the basal margin regularly curved, presenting no evidence 
of a sinus or depression as in the last. 
Fig. 4 a. Right valve, showing the posterior muscular impression a. 
Fig. 4 b. Cardinal view of the same specimen. 
Position and locality. In the lower part of the Trenton limestone at Canajoharie and 
Middleville. 
