SUPPLEMENT. 251 



however, and apparently in these fossils, are less elevated and more brightly 

 enamelled than those of the new specimen now described. In shape the new 

 teeth agree more closely with those observed within the month of the Gono- 

 rhynchid, Oharitosomvs major, from the Upper Cretaceous of Mount Lebanon 

 (A. S. Woodward, Cat.il. Foss. Fishes Brit. Mus., pt. iv, 1901, p. 273, pi. xv, fig. 3). 



Frotosphyraena, Leidy (p. 1-15). 



Part of a notochordal tail, certainly of this genus, from the Chalk of Kansas, 

 U.S.A., has been described and figured by C. E. McClung, Kansas Univ. Science 

 Bull., vol. iv (1908), p. 2-1.5, pi. xiii. 



Protosphyraena stebbingi, A. S. Woodward (p. 15:3). 



Mr. Thomas Sheppard has obtained for the Hull Museum a large part of the 

 rostrum of this species from the zone of Holaster subglobosus at South Ferriby, 

 Lincolnshire. The new specimen, showing part of the rostrum which is missing 

 between the two fragments of the type specimen, curves slightly upwards in front. 

 All the ridges on its upper face are more or less tuberculated. A description and 

 figure will appear in The Naturalist. 



Gyrodus (?) cretaceus, Agassiz (p. 1G7). Plate LTV, fig. 5. 



The nearly complete lower dentition of this species, discovered by Mr. George 

 Hutchings, is shown of the natural size in PI. LIV, fig. 5. It is proved to cover 

 the splenial element on each side to its outer margin, and the bone is seen to rise 

 into a small coronoid elevation behind. The teeth are crowded and remarkably 

 irregular iu size, arrangement, and amount of wearing; but the principal 

 longitudinal row of comparatively large teeth is distinguishable, and a regular 

 marginal series in front seems to belong to the dentary bones. The supposed 

 dentary teeth, of which four occur on the right side of the fossil, are round and 

 considerably elevated, each in the form of a blunt cone with a wide cingulum 

 encircling its base (fig. 5(f). A similar dental crown was obtained by Mr. F. 

 Harford from a Turonian zone at Upper Hailing, Kent (B.M. no. P. 5G17). The 

 teeth of the principal longitudinal row on the splenial are very variable in size and 

 shape, but most of them are slightly longer than broad, with a bluntly conical 

 crown passing down into a wide basal cingulum (fig. 5c) ; only a few of the 

 hinder teeth exhibit the lateral compression and forward displacement of the 

 coronal apex already described in the fragment shown in PI. XXXV, fig. G. The 

 irregular manner in which they are worn by the opposing teeth is curious. Most 



