BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 
. Description of Hesperomys truei, a new species belonging to 
iP .2a0. 
the subfamily Murine. By R. W. Shufeldt. 
pp. 403-408, 1 plate. 
Notes on some apparently preoccupied ornithological generic 
names. By Leonhard Stejneger. 
pp. 409-410. 
. The Chaclacayo trephined skull. By Otis T. Mason. 
P. 534. 
P. 540. 
pp. 410-412, 1 plate. 
2. On the parasites of the Hessian fly. By C. V. Riley. 
pp. 413-422, 1 plate. 
3. Description of Leptophidium cervinum and L. marmoratum, 
new fishes from deep water off the Atlantic and Gulf coasts. 
By G. Brown Goode and Tarleton H. Bean. 
pp. 422-424. 
Notice of recent additions to the marine invertebrata of the 
northeastern coast of America, with descriptions of new 
genera and species and critical remarks on others. Part V. 
Annelida, Echinodermata, Hydroida, Tunicata. By A. E. 
Verrill. 
pp. 424-448. 
Report on the flora of western and southern Texas. By V. 
Havard. 
pp. 449-533, 1 fig. 
. Notes on the mollusks of the vicinity of San Diego, California, 
and Todos Santos Bay, Lower California. By Charles R. 
Orcutt and William H. Dall. 
pp. 534-552, 1 plate. 
. Notes on a collection of fishes from Florida, with descriptions 
of new or little known species. By O. P. Hay. 
pp. 552-559. 
. Description of an apparently new species of Dromococcyx from 
British Guiana. By Robert Ridgway. 
p. 559. 
. Catalogue of a collection of birds made on the island of 
Cozumel, Yucatan, by the naturalists of the U. S. Fish Com- 
mission steamer A/batross, Capt. Z. L. Tanner, commander. 
By Robert Ridgway. 
pp. 560-583. 
Contributions to the history of the Commander Islands. No. 5 
Description of a new species of MMesoplodon, M. stejnegeri, 
obtained by Dr. Leonhard Stejneger in Bering Island. By 
Frederick W. True. 
pp. 584-585, 1 plate. 
. A note upon the Hyperoodon semijunctus of Cope. By Fred- 
erick W. True. 
Pp. 585-586. 
2. Fresh-water sponges from Mexico. By Edward Potts. 
pp. 587-589, 1 fig. 
