68 CALIFORNIA ACADEMY OF SCIENCES. 



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

 mordial fossils. 



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

 Agnostiifi nohilis 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. 



Microdisctis speciosus, fig. 2 a, b, n. sp. Leperditia troyensis n. sp. 



Note on the discovery of a new locality of 



Primordial fossils in Rensselaer County, New York. 



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

 Conocephcdites (A tops) trilineatus Emmons. 



On additional species of fossils from the 



Primordial of Troy and Lansingburg, Kensselaer County, 

 New York. 



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

 Microdiscus meeki n. sji. 



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 oi Trilobites, includ- 

 ing figures of Microdiscun speciosus Ford. 



Note on the Trilobite Atops trilineatus Em- 



mons. 



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



