CONTENTS. VII 



Page. 



Kathbun, Mary J. The Decapod Crustaceans of West 



Africa.— No. 1199. May 12, 1900 271-316 



New species: Clibanarius cooki. 



Richardson, Harriet. Description of a New Species of 

 Idotea from Hakodate Ba}^, Japan. — No. 1189. February 

 2, 1900 131-134 



New species: Idotea japonica. 



Richmond, Charles W, Description of a New Bird of the 



Genus Dendrornis.— No. 1200. May 12, 1900 317-318 



New species: Dendrornis siriatigularis. 



. Descriptions of Three New Birds from Lower 



Siam.— No. 1201. May 12, 1900 319-321 



New species: JEthopyga anomala, Criniger sordidus, Turd imdus grand. 



Schuchert, Charles. On the Lower Silurian (Trenton) 



Fauna of Baffin Land.— No. 1192. April 9, 1900 113-177 



New species: Plasinopora lambii, Porocrinus shaivi, Ctenodonta carpen- 

 deri, C. baffinensis, C. frobisherensis, Modiolodon arcticus, Whiteavesia 

 symmeiricus, Cyrtodonta sillimanensis, Vanuxemia baffinensis, Whitella 

 arcticus, Seelya {?) {Plethospiraf) ulricM, Holopea ardica, Orthoceras 

 porteri, Orthoceras scalariformis, Cyrtoceras cormdum, C. baffinensis, 

 Oncoceras arcticum, 0. tumidum, Dalmanites {Pterygometopus) 

 goodridgii. 



New varieties: Orthis (Dinortlds) meedsi var. arctica, Orthoceras olorus 

 var. baffinensis. 



Simpson, Charles Torrey. Synopsis of the Naiades, or 



Pearly Fresh-water Mussels.— No. 1205. October 8, 1900.501-1044 



New genera: Pseudospatha, Cham,berlainia, PUsbryoconcha, Dromus, 

 Pegias, Arcidens, Skistodesmus, Gibbosula, Cuneopsis, Physiinio, 

 Dcdliella, Ptychorhynchus, Virgus, Ctenodesma, Eectidens, Lamelli- 

 dens, Pseudavicula, Arcidopsis, Castaliella, Callonaia. 



New subgenera: Pdea, Caudicidcdiis, Pletliolop)hns, Crassitesta, Pseu- 

 clobn, Ptychoderma, Pressodonta, Rugifera, Bullella, Lamprotula, 

 Discomya, Aurora, Pseudobaphia, Acuticosta, Lamellidens, Trape- 

 zoideus, Spathopsis, Triqueirana, Hyriana, Cyclomya, Lievirostris, 

 Pseudomutela. 



New species: Diplodon leai, Glabaris umbonatus, falsus. 



New varieties: Truncilla sulccda var. delicata, LampsiUs ligamentinus 

 var. gibbus, ^LampsiUs texasensis var. compressus, Tritogonia iuber- 

 culata var. obesa, Unio gibbosus var. delicatus, Pleurobema fassincms 

 var. rhomboidea, Cyprogenia irrorata var. pusilla, Quadnda kirtlandi- 

 ana var. minor, Quadnda coccinea var. paupercula, Quadnda gran- 

 ifera var. pusilla. 



