TABLE OF CONTENTS. 



Paga 

 A E fi<"ii, J. A. Descriptions of i wo supposed new species of mice from Costa Rica and Mexico, 



witli remarks on Hcsperomys niclaiiophiys of Coues 19lt-196 



Onjzomys talamanciv, Hetperomys (Vegperimus) ajlnis, new species. 



Andrcwiii, E. A. Report upon the xVnnelida Polychajta of Beaiifort, North Carolina (Phites 



xn-xviii) 277-:{02 



JIarmothoe aciileata, Eunice ornata, Diopatra magna, OjiheUna agilin, Pali/dora coininen- 



ialis, Axiothea )nucoi<a, I'etaloproctus socialis, Ammocharcs cBdiJicator, Loimia taryida, 



new species. 



Bran, Barton A. Fishes collected by William P. Seal, in Chesapeake Bay, at Cape 



Charles City, Tirginia, Se]>t ember 16 to October 3, 1890 83-94 



Benedict, JaiurN K. and Kathbun, iWary J. Tlie Genus Panopeus. (Plates xix- 



X XIV) 355-385 



Panopeus areolatus, Panopeus disiimilis, Panopeus ovatug, Panopeus anguetifrons, Pano- 



pens hemphillil, Panopeus hermudensis, new species. 



Clierric, CJeorgc K. Notes on Costa Kican birds 517-537 



Description of new genera, species, and subspecies of birds from Costa Rica 337-346 



Deconyehura, Premnoplex, now genera. 



Lophoti locus zeledoni, Pac.hy rhamphus ornaUis, Deconyehura (ypica, Yireo supercilians, 

 Basilniteivs salvini, Grallarializanoi, Myrmeciza intermedia, new species. Lophotric- 

 cus siua)nicii,statuii minor, new subspecies. 

 t'ope, K. n. On the character of some Paleozoic fishes. (Plates xxvill-xxxiii) 447-463 



Styptiibiiiiis knigldiana, new genus and species. 



JTyhodus regularis, Ctenacanthun amhlyxiphias, Platygnmus palmaris, Platysomux laco- 

 vianug, new species. 



A critical re\'iew of tlie characters and variations of the snakes of North America 589-694 



Ivutcenia aurata, new species. Eutcenia girtalis gemifasciata, Eutcenia girtalis triline- 



ata, new subspecies. 

 DnII, tVilliani II. (Scientific results of explorations by theU. S. Fish Commission steamer 

 A Watrosn) . No. XX — . On some new or interesting west American shells obtained from the 

 ilredgings of the U. S. Fish Commission steamer Albatross, in 1888, and from other sources, 



(Plates V-VIl) 173-191 



Calyptogena, new genus. Trophon c:'rroseniii, Cancellaria Crawfordiana, Buccimim 

 ttrigillatum, Buccinum taphrium, Mohnia Frielei, Strombella Middendorfii, Strombella 

 fragiUs, Strombella melonis, Cliry.<.odomus ithiug, Chrysodomxis perigcelidvs, Chryso- 

 doniug phoeniceus, Chrytodomug eucosmius, Chrysodomua (Sipho) hypolispug, Chryso- 

 domxis (Sipho) aconmirig, Crysodonms {Sijiho) haUbrectus, Trophon (Boreotrophon) 

 scitulus, Trophon (Boreotorphon) desparilis, Solernya Johngoni, Calyptogena pacifica, 

 Limopgig vaginatug, new species. 

 Terebralella occidentalig ohsoleta, new svibspecies. 

 Kigeuinann, Carl H., and Rosa H. A catalogue of tlie fresh-water fishes of South 



America 1_81 



Krcruiann, Barton "\V., and Jenkins, Oliver P. Report upon a collection of fishes, 

 made at Guaymas, Sonora, Mexico, with descriptions of new species. (Plates l-Ii) Jihinop- 

 tcra steindachneri, Menidia clara, TJpcneus rathbuni, new species. 121-165 



Gilbert, Charles II. (Scientific results of explorations by the U. S. Fish Commission 



steamer Albatross.) No. xxi.— Descriptions of apodal fishes from the tropical Pacific 347-352 



Xenomystax, Ilyophis, new genera. 



Chlopgis equatorialis, Xcnomystax atrarius, Ophisoma prorigerum. Ophigoma inaerurvm, 

 Ilyophis brunneus. new species. 



(Scientific results of explorations by steamer Albatrogs.) No. xxil.— Descriptions of 



thirty-four new species of fishes collected in 1888 and 1889, principally among the Santa 

 Barbara Islands and in the Gulf of California r. i!i-,5G8 



Chriolepig, new genus. 



Paia trachura, Catulug xanlurug, Catulus cephalus, Catului[brunneus, Eulamia ( Platy- 

 podon) i}latyrhynchus, Stolephorug cultratns, ^yctophinn regale, Alepocephalug tencbro- 



III 



