Lorraine Faunas of Neiv York and Quebec 287 
south of Barnes Corners, associated with Modiolopsis inodiolaris 
and Catazyga erratica, and at Worthville, but the best speci- 
mens were collected about two and a half miles east of Worth- 
ville (plate III, Fig. 5 A. B.), in association with Ischyrodonta cf. 
unionoides, and it is the first mentioned specimen which forms 
the basis of the following description. The horizon of the species 
is distinctly above that exposed at the village of Lorraine, and 
also above that exposed east of Pulaski. No specimens of Plec- 
tambonites or Dalmanellaj so common at the lower horizons, have 
been noticed here. Although further investigations may result 
in the finding of these genera also at higher horizons in the 
Lorraine, they are known to be at least very rare there. In the 
preceding lists of fossils, the species mentioned as related to 
Ischyrodonta unionoides is the I schyrodonta curta of Conrad. 
Species belonging to the group of Orthodesma curvatum, Hall and 
Whitfield, from the Waynesville division of the Richmond, but 
differing in many particulars. In a specimen about 44 mm. in 
length, the cardinal margin is only slightly convex for a distance of 
about 20 mm. posterior to the beak; then it curves more rapidly 
downward into the very oblique posterior margin. The latter 
forms an angle of about 35 to 40 degrees with the longitudinal 
diameter of the shell. Greatest curvature at the lower part of 
the posterior margin, where it rounds strongly into the only 
slightly convex basal margin. Near the beak this margin curves 
upward into the strongly rounded anterior margin. The striking 
feature of the shell, that which suggested the name nasutum, is 
the distinct dropping of the cardinal margin anterior to the beak. 
Although this is exaggerated in HalFs figure of Orthodesma nasu- 
tum, it is nevertheless real. About 8 mm, anterior to the beak 
this lowering of the upper margin of the shell amounts to fully 3 
mm. The umbonal ridge is only weakly defined, and rounds into 
the general convexity of the shell; the area of greatest convexity 
lies rather near the cardinal margin posterior to the beak and then 
curves gradually downward toward the lower part of the posterior 
margin. Anterior to the beak, the shell is depressed, adding to the 
nasute appearance of the shell. There is no indication of a mesial 
sinus. Surface weakly marked by concentric striations, which are 
most distinct anteriorly, and fairly distinct along the basal margin. 
Greatest height at midlength, about 15.5 mm.; diminishing to 
13 mm. at the beak, owing to the downward curvature of the 
