SI 



It .should be premised, also, that an opinion is gaining ground tliat 

 sedimentary deposits which contain fossils of exclusively land or fresh 

 water origin, such as the Purbecks and Wealden, should be tabulated in 

 a separate series from the purely marine strata, and not intercalated 

 between them.* 



The collection obtained bj- Mr. Eichardson is remarkable for the 

 almost total absence of those genera which are restricted to a single 

 epoch, and the fossils for the most ])art are strikingly unlike those of 

 any known division of the Mesozoic ;ige in America. 



The following is a synoptical list of the s])ecies, an-anged in zoological 

 order : — 



Including the shells rsferred doubtfully to Scalaria Albensis and 

 Melina mytUoides, twenty-two of the above are represented by such 

 imperfect specimens that the species, and in some cases even the 

 genera, cannot be determined with any precision. A few are probably 

 new to science, but they are not m a satisfactory condition for descrip- 

 tion. Of the remainder, seventeen are now described and figured for the 

 first time, while six belong to foi-nis Avhich have fteen named and 

 characterized by other writers. 



It has already been stated that these invertebrates present '"an appa- 

 rent mixture of Oolitic and Ci-etaceous types," and this opinion is based 

 upon the following facts : — 



Five of the new species, and three of the doubtful forms, bear a 

 suggestive, but, at the same time, only a very general resemblance to 

 European Oolitic fossils, which may be thus expressed : 



'See Prof. .J. Yomig's Address before the Geological Section tpf the LJiitJsh Association for the Ad\auct- 

 inent of Science, at Glasgow, 137C. 



