334 Mr. II. L. Smith on a new Growing Slide for the Microscope. 



nized from fossil evidence. The most common of the fossils is 

 a species of Inoceramus with coarsely fibrous shell, nearly \ inch 

 thick, agreeing in size and shape almost exactly with the English 

 Inoceramus mytiloides (Sow.), from which it differs in having 

 the hinge-line rather longer, the anterior end more pointed, and 

 the superior posterior angle rather more obtuse. This species 

 I have named, in a paper read recently before the Royal Society 

 of Victoria, /. Carsoni (M'Coy), in honour of one of the donors. 

 The second most common fossil is a much larger and broader 

 species of the same genus, which I at the same time named 

 Inoceramus Sutherlandi (M'Coy), after the other donor of the spe- 

 cimens, which were so painfully carried, from the remote point 

 indicated to the settled districts, on their saddle. This second 

 species, in form, size, and concentric undulations of the surface, 

 nearly agrees with the French and English common Cretaceous 

 /. Cuvieri, but is less curved at the ventral margin near the beak. 



The next shell is an Ammonite, in size, number and involu- 

 tion of whorls, shape, markings, and septa, so nearly identical 

 with the very common A. Beudanti (Br.) of the French Lower 

 Chalk, that, but for being slightly less compressed, and a slight 

 difference in some of the septal lobes, it could scarcely be sepa- 

 rated, even as a variety. I have named it Ammonites Flindersi 

 (M'Coy), to call attention to the locality. It may be described 

 as follows : — 



Ammonites Flindersi. 



Discoid, moderately compressed ; periphery narrow, obtusely 

 rounded ; whorls 4^, about one-fourth of the width of each ex- 

 posed in an obtusely angular-edged, flat-sided umbilicus ; sur- 

 face crossed by obtuse sigmoid strise, some of which are more 

 prominent than the more numerous intervening ones. Diameter 

 6 inches, proportional thickness -^, width of last whorl -^oV 

 Seven much divided lobes in the septa of each side, two of which 

 are within the edge of the umbilicus. 



With these shells three vertebrae of a large Teleosteous fish 

 occur. 



The matrix of these specimens is an olive calcareo-argillaceous 

 marl. 



XXXIX. — On a new Growing Slide for the Microscope. 



By H. L. Smith, Kenyon College, U.S.* 



In studying the growth and conjugation of the Diatomacese, I 



have felt the want of some means of keeping them alive for a 



long time under the microscope, and have devised for this pur- 



* From Silliraan's American Journal of Science, September 1865. 



