64 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 



P. 553. On the value of the fin-rays and their characteristics of 

 development in the classification of the fishes, together 

 with remarks on the theory on degeneration. By John A. 

 Ryder. 



pp. 71-82, 1 fig. 



P. 554. On fulgurites. By George P. Merrill. 



pp. 83-91, 1 plate. 



P. 555. Descriptions of some new species of birds, supposed to be 

 from the interior of Venezuela. By Robert Ridgway. 



pp. 92-94. 



P. 556. On ^Estrelata sandwichensw Ridgw. By Robert Ridgway. 



pp. 95-96. 



P. 557. Descriptions of a new genus and species of mole, Dymecodon 

 pilirostris, from Japan. By Frederick W. True. 



pp. 97-98. 



P. 558. Review of Japanese birds. 1. The woodpeckers. By Leon- 

 hard Stejneger. 



pp. 99-124, 1 plate. 



P. 559. Catalogue of animals collected by the Geographical and 

 Exploring Commission of the Republic of Mexico. By 

 Fernando Ferrari-Perez. 



pp. 125-199. 



P. 560. The British marsh-tit. By Leonhard Stejneger. 



pp. 200-201. 



P. 561. Report on the mollusks collected by L. M. Turner at Ungava 

 Bav, North Labrador, and from the adjacent Arctic seas. 

 By" William H. Dall. 



pp. 202r-208, 1 plate. 



P. 562. Contributions to the natural history of the Commander 

 Islands. No. 6. Report on Bering Sea Island mollusca, 

 collected by Mr. Nicholas Grebnitzki. By William H. Dall. 



pp. 209-219. 



P. 563.- On the occurrence of a new species of Rtdnoptera (R. rneenadce) 

 in Todos Santos Bay, Lower California. B} T Rosa Smith. 



p. 220. 



P. 564. An annotated list of the mammals collected by the late Charles 

 L. McKay in the vicinity of Bristol Bay, Alaska. By Fred- 

 erick W. True. 



pp. 221-224. 



P. 565. Notes on some fishes collected at Pensacola by Mr. Silas 

 Stearns, with a description of one new species (Chcetodon 

 aya). By David S. Jordan. 



pp. 225-229. 



P. 566. A review of the American species of Tetraodontidae. By 

 David S. Jordan and Charles L. Edwards. 



pp. 230-247. 



