68 CALIFORNIA ACADEMY OF SCIENCES. 



Ford (S. W.) Description of some new species of Pri- 

 mordial fossils. 



In Am. Jour. Sci., 3d series, vol. 3, 1872, p. 419. 

 Agnostns nobilis n. sp. 



Descriptions of new species of fossils from the 



Lower Potsdam group at Troy, New York. 



In Am. Jour. Sci., 3d series, vol. 6, 1873, p. 137. 



Microdisciis speciosus, fig. 2 a, b, n. sp. Leperditict troyensis n. sp. 



Note on the discovery of a new locality of 



Primordial fossils in Rensselaer County, New York. 



In Am. Jour. Sci., 3d series, vol.9, 1875, p. 204. 

 Conocephalites (A tops) trilineatus Emmons. 



On additional species of fossils from the 



Primordial of Troy and Lansingburg, Rensselaer County, 

 New York. 



In Am. Jour. Sci., 3d series, vol. 11, 1776, p. 369. 



Microdlscus meeki n. sp. 



Note on Microdiscus speciosus. 



In Am. Jour. Sci., 3d series, vol. 13, 1877. p. 141. 



On some embryonic forms of Trilobites. 



In Am. Jour. Sci., 3d series, vol. 13, 1877, p. 265, pi. 4. 

 Metamorphoses of Olenellus (Elliptocephalus) asaphoides Emm. 



Description of two new species of Primordial 



fossils. 



In Am. Jour. Sci., 3d series, vol. 15, 1878, p. 124. 

 Solenopleura nana n. sp. 



Note on the development of Olenellus asapho- 

 ides. 



In Am. Jour. Sci., 3d series, vol. 15, 1878, p. 129. 



Life of the Silurian age. 



New York Tribune Extra, September 2, 1879. 



In this paper Mr. S. W. Ford gives generic figures of Trilobites, includ- 

 ing figures of Microdiscus speciosus Ford. 



Note on the Trilobite Atops trilineatus Em- 

 mons. 



In Am. Jour. Sci., 3d series, vol. 19, 1880, p. 152. 



