Cretaceous Fossils found in Aberdeenshire. 29 



a cast and as the shell is smooth, one cannot be quite sure of the 

 species, but the shape is well preserved, and 1 am indebted to 

 Mr. Mej'er for pointing out that it has the squareness towards 

 the front which is characteristic of the species in question. This 

 is well shown in the example figured by Davidson ("Cret. Brach.," 

 vol. iv, pi. vi, figs. 12-14), which came from the Speeton Clay 

 of Knapton in Yorkshire. 



Lima semisulcata, Sow. — This species has appeared in previous 

 lists on the authority of Mr. Salter, but the specimen is in the 

 Jermyn Sti'eet Museum, and Mr. Newton informs me that it is 

 only an internal cast, and may, with equal probability, be referred to 

 L. Dupiniana. As specimens of the latter do occur, and none 

 referable to L. semisulcata have since been found, I think this 

 Upper Cretaceous species maj' be omitted from the list. 



Area securis, D'Orb. — I have ventured to enter the common Area 

 of the Moreseat sandstone under the name of securis instead of 

 under carinata, because the specimens I have examined seem to 

 me to come nearer to securis, and Mr. Meyer, to whom a specimen 

 was sent, is of the same opinion. The two species are so closely 

 allied that some paleeonto legists regard them as identical ; but 

 there are slight differences, and Messrs. Sharman and Newton 

 agree with me in considering the Moreseat specimens to be smaller 

 and shallower in the valve than the ordinary A. carinata of the 

 Upper Greensand ; and in these respects they resemble A. securis. 

 In some of them, moreover, the ribs on the posterior area are like 

 those in D'Orbigny's figure of securis ; so that, if the forms are 

 separable, I think these should be listed as securis. 



Leda scapha (?), D'Orb. — I have seen two casts which probably 

 belong to this species, though they equally resemble L. Marice of 

 the Gault, for, as Mr. Gardner has remarked, there is very little 

 difference between these species. 



PectuncuJus umbonatus, Sow, — This is another of Mr. Salter's 

 identifications, and unfortunately it also is only an internal cast. 

 There are several species of Petuncidus to which such a cast 

 might belong, but the probabilities are against its being P. umbonatus. 

 As no other specimen has occurred among the fossils recently 

 collected, it will be best to leave it without a specific name for the 

 present. 



Turbo Triboleti (?), Pict. and Camp. — There is one specimen, 

 a portion of the external impression of the shell, showing an 

 ornamentation closely resembling that of Turbo Triboleti, which 

 is a species from the Upper Gault of Ste. Croix. This specimen 

 was sent to Mr. Meyer, who informs me that he has an imperfect 

 specimen from the Vectian of the Isle of Wight which it equally 

 resembles. 



Ammonites Jlexisulcatus (?), D'Orb. — A small Ammonite was found 

 in breaking up a lump of the material sent to me, and was 



