FOSSILS FROM THE UPPER GREENSAND. 105 



Ammonites dispar of d'Orbigny is a closely allied species, but 

 differs in several respects from Am. rhamnonotus. In dispar the 

 ribs are straight and pass evenly over the back of the young shell, 

 while the last part of the whorl is almost smooth, only a few ribs 

 starting at wide intervals from the umbilicus, and failing to reach 

 the back. Whether the forms referred to dispar by Pictet and 

 Campiche are really that species or belong to rhamnonotus can only 

 be determined by a comparison of English, French, and Swiss 

 types. 



Ammonites varians, Sow. This is a common fossil in the 

 Chloritic and Chalk Marls, but is very rarely found in the Upper 

 Greensand and only in the highest beds. In the Dorchester 

 collection there is only one specimen of this species from the 

 sandstone, but Mr. Rhodes collected several for the Geological 

 Survey, together with some specimens which Mr. Sharman believes 

 to be Am. Salteri (Sharpe), a species which has similar ribs, but no 

 keel on the back. 



Solarium Binghami, Baily. The Museum contains a well- 

 preserved cast in calcite of a pretty little Solarium, and I found it 

 labelled " S. Binghami, Baily," probably as Mr. Moule tells me by 

 Mr. Baily himself, who named some of the fossils many years ago. 

 I have not been able to find out whether it was only a manuscript 

 name or whether the shell was described by Baily. The species is 

 mentioned by H. G. Seeley in the Geologist, Vol. VII., p. 89 

 (1864), but though the name is credited to Baily, no reference is 

 given to any previous description, nor is any locality given for the 

 fossil. There is, however, a very rough sketch of the shell in the 

 plate accompanying Mr. Seeley's paper, and this sketch might have 

 been taken from the specimen in the Dorchester Museum, though, 

 if so, it should not have been included among Chalk Mollusca. 



Area glabra, Park., with which I associate A. fibrosa> as a mere 

 variety, has been figured in many monographs, and is a common 



