Lorraine Faunas of New York and Quebec 325 
direction, somewhat as in Byssonychia praecursa, Ulrich, described 
from the Lorraine shales of Lorraine, New York. The original de- 
scription states that, anteriorly, the shell is strongly arched or 
convex, and steeply or abruptly cut off. This type of structure 
occurs in Byssonychia praecursa and B. richmondensis. In the 
figure presented by Goldfuss, the abruptness and flattening of the 
anterior face is not strongly indicated, but is suggested by the con- 
siderable width of the anterior face, both valves being present 
in the individual figured. 
The following description was presented by Goldfuss: 
Pterinea testa ovata ventricosa obliqua antice abrupta postice 
declivi, margine cardinali brevi, ala postica truncata, costis radiantibus 
regularibus convexis, interstitiis latioribus plano-concavis. 
Occurit in Psammite Americae septemtrionalis et Provinciae mon- 
tanae. M. B. 
Steinkerne dieser Art kommen bei Lewistown in Oneida-County und 
im Bergischen in der Grauwacke vor. Sie sind eyfoermig, vorn hochge- 
woelbt und steil abgeschnitten, nach hinten abschluessig, in den kurzen 
stumpf winkeligen Fluegel uebergehend. Die kurze Schlosslienie macht 
der Achse einen spitzigen Winkel, und vom Winkel strahlen starke, 
convexe Bippen aus, welche nach hinten allmaelig schmaeler werden. 
Ihre Zwischenraeume sind eben so breit und flach-concav. Bei einem 
Exemplare sieht man vor dem Wirbel leistenfoermige Zaehne, und bei 
einem andern sind Spuren zahlreicher concentrischer Streifen bemerklich. 
The figure published by Goldfuss leaves no doubt of the dis- 
tinctness of Byssonychia carinata from Byssonychia radiata. 
The description and the figure together indicate a species of the 
Byssonychia praecursa and Byssonychia richmondensis type. 
Considering the fact that the former species was described from 
the Lorraine of New York and that the latter is a Richmond form, 
the presumptive evidence might be considered at first as in favor 
of Byssonychia praecursa. According to Ulrich, the number of 
radiating plications in Byssonychia praecursa varies from 38 to 
42, while those of Bysonychia richmondensis number not less 
than 50. It is practically certain that the number of plications 
indicated by the figure of Byssonychia carinata published by Gold- 
fuss is too small. In Byssonychia praecursa the anterior face is 
not as strongly flattened and the beak is more rounded than in 
Byssonychia richmondensis. These also are features apparentU 
indicated by the figure of B. carinata. As regards the locality 
