546 The American Naturalist. [June, 
Peck, J. I.—Variation of the spinal nerves in the caudal region 
of the domestic Pigeon. Jour. Morphol., III., p. 128, 1889.— 
Finds that the nerves vary in correlation with the parts. 
Ripeway, R.—A review of the genus Xiphocolaptes of Lesson. 
Proc. U.S. Nat. Mus., XII., p. 1, 1889 [1890]—A study of the 
collections of Washington, New York, Boston and Cambridge. 
The forms within the limits of this record are X. sclateri, nov. 
(Mexico), emigrans (Guatemala), costaricensis. 
Ripeway, R—A review of the genus Sclerurus of Swain- 
son. Proc. U.S. Nat. Mus., XII., p. 21, 1889 [1890]—Forms 
within the limit of this record are S. albogularis (Tobago), canigu- 
laris (Costa Rica), mexicanus (Mexico, South), guatemalensis 
(Guatemala to Panama). 
Ripeway, R.—Birds collected [by the U. S. Fish Commission 
Steamer Albatross] on the Island of St. Lucia, West Indies [etc. ] 
in 1887-’88. Proc. U. S. Nat. Mus., XII., p. 129, 1889 [1890]. 
—Fifteen species enumerated from St. Lucia. 
MAMMALS. 
Merriam, C. Hart.—A correction : Arvicola (Chilotus) pallidus. 
Am. Nart., XXIIL, p 60, 1887. 
RYDER, J. A—The quadrate placenta of Sciurus hudsonius. 
Am. Nat., XXIIL, p. 291, 1889. 
Aurp, R. C.—Some cases of solid-hoofed hogs and two-toed 
horses. Am. Nart., XXIII., p. 447, 1880. 
Haraittr, C. W.—Interesting cases of color variation. Am. 
Nart., XXIII., p. 449: 
Davis, Wm. T.—The song of the singing mouse. Am. NAT., 
XXIII., p. 481, 1889. 
GREENMAN, M. J.—Placentation of the Cat. Am. TO XXIIL, 
p- 645, 1889. 
Aurp, R. C—The segregations of polled races [of cattle] in 
America. Am. NAT., XXIL) p. 677, 1889. 
SpitzKa, E. C—-Remarks on the brain of the seals. Am. NAT., 
XXIV., p. 115, 1890. 
CoLLETT, Joun.—Bats in Wyandotte Cave. Am. Nat., XXIV. 
p. 189, 1890. 
