WH1TB.1 PALEONTOLOGY — CRETACEOUS FOSSILS. 311 



Genus AifCHUEA Conrad. 



Anchura haydeni (sp. nov.). 



Plate?, fig. la. 



Shell large ; body, exclusive of the wing and including the beak, sub- 

 fusH'orm ; spire elongate, about equal in leng-th to the body-vohition and 

 the beak together; volutions ten or twelve, moderately convex; those 

 of the spire marked by longitudmal nodes, which dt^iappear before reach- 

 ing the suture at either side of the volution, but they approach more 

 nearly to that of the proximal side; suture linear or faintly imjiressed; 

 surface of the volutions of the spire marked by from five to seven strong- 

 revolving raised lines, which are of about equal strength ui)on and 

 between the longitudinal nodes ; numerous minute revolving raised lines 

 also cover the siu'face between the stronger ones just mentioned, and 

 these are crossed by numerous fine, sharply raised lines of growth, giv- 

 ing the well-preserved surface of the sheU a finely cancellated appear- 

 ance under the lens. Ui)on the body- volution, the longitudinal nodes 

 gradually disappear and are replaced by a median row of smaller nodes, 

 continuous yvith the former, and also with the strong plain carina which 

 extends out upon the wing to its posterior extremity, and lies near to and 

 nearly i)arallel with the posterior border of the wing. The stronger re- 

 volving lines of the spire become still stronger ^\ath the increase in size of 

 the volutions, but they disappear upon reaching the wing. Four or five of 

 those immediately in front of the median convexity of the body- volutions 

 are esx)ecially strong, and become sharply raised ridges with channels of 

 about equal width between them ; in front of these is a series of smaller 

 ones, the representatives of which are covered by the successive turns of 

 the spire, and which terminate ui)on and at the base of the beak. Beak 

 long, slender, straight, pointed. Wing large, projecting much beyond 

 the ai)erture, constricted in the middle of its transverse i>ortion, but 

 expanding again beyond ; the posterior part much extended and termi- 

 nating in a long, somewhat strong, pointed process, which is angular 

 along its back ; the anterior portion of the outer part of the Aviug is 

 jirominent, projecting forward and abruptly rounded; posterior border 

 deeply concave; exterior border nearly or quite straight; anterior border 

 ha\'ing a general concavity, but a sinuous outline. Outer surface of the 

 wing more or less strongly wrinkled in the direction of the lines of 

 growth. The direction of these wrinkles and of the lines of growi:h indi- 

 cates that before the wing was fully formed the autero-exterior portion 

 of the wing was less prominent than when adult. Inner lip aj^parently 

 without a callus. 



Length, from the point of the beak to the apex of the spire, upward 

 of 10 centimeters ; length of beak, 2^ centimeters ; breadth of body- vo- 

 lution, including the wing, G.J centimeters ; diameter of body- volution, ex- 

 clusive of the wing, 28 millimeters. 



The characteristics of this species do not strictly correspond with the 

 requirements of either the typical forms of Anchura Conrad or the sub- 

 genus JJrcpanocheilus Meek. From the former it dilfers in not having an 

 anterior as well as a i^osterior pointed process to the wing, unless the 

 blunt projection of that portion of the wing of this species may be re- 

 garded as a sufficient generic equivalent. From the latter it differs in 

 having the long beak, which is characteristic of the tn>ical forms or 

 Anclmra. This is much the largest species of Anchura known to me, and 

 it differs too mdelj' from any described form to need comparison. ThQ 



