26 LIST OF CONTRIBUTORS. 



Conrad, Timothy Abbott. Continued. 



Notes on shells. P '77, 24 



Observations on the Eocene formation, and descriptions of 



one hundred and five new fossils of that period, from the vicinity 

 of Vicksbnrg, Mississippi, with an appendix. J I, 111 



Descriptions of new fossil and recent shells of the United 



States. J I, 207 



— Notes on shells with descriptions of new genera and species. 

 J I, 210 



— ■ Descriptions of new fresh water and marine shells. J I, 275 



— Descriptions of one new Cretaceous and seven new Eocene 



fossils. J II, 39 



— Descriptions of new fossil shells of the United States. J II, 

 273 



— Descriptions of new species of Unio. J II, 295 



— Synopsis of the genus Pleiodon. J II, 298 



— Descriptions of new fossil shells of the United States. 



J II, 299 



— Monograph of the genus Argonauta Linne, and descriptions 

 of five new species. J II, 331 



— Synopsis of the genera Parapholas and Penicilla. J II, 335 



— Observations on a group of Cretaceous fossil shells, found 



in Tippah County, Miss., with descriptions of fifty-six new 

 species. J III, 323 

 - — ■ Descriptions of new species of Cretaceous and Eocene fossils 



of Mississippi and Alabama. J IV, 275 

 Conrad, T. A. and Wm. M. Gabb. Illustrations of some fossils 



described in the Proceedings of the Academy of Natural 



Sciences. P '60, 55 

 Cook, Margaret Harris. Spermatogenesis in Lepidoptera. 



P '10, 294 

 Cook, 0. P. Summary of new Liberian Polydesmoidea. P '96, 257 

 Cooke, C. Montague, Jr. See Pilsbry, 11. A., and C. M. Cooke, Jr. 

 Cooke, M. C. The Valsei of the United States. P 77, 110 

 Cooper, .1. (J. On a new cormorant from the Farallone Islands, 



California. P '(55, 5 



On new Californian Pulmonata, etc. 1* '72, 143 



Cope, Edward 1). On the primary divisions of the Salamandridae 



with descriptions of two new species. I* '5!), 122 

 Notes and descriptions of foreign reptiles. 1' '59,294 



