880 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [FotV. 



Heliornithidae. 



1840. Branixt, J. F, Einige Bemerkungen iiber Podoa und ihr Verlialtniss zu FuUca, 

 Podiceps und den Steganopoden. <^ M^7n. de I'Acad. St. -Petersh. , vi s^r. , t tome, 

 ii pte. , Sc. Nat. , iii, 1840, pp. 197-202, pll. xi, xii. 



A subtitle, being the tloird part of Ms series entitled : Beitrage zur Kenntniss der Natnrg. 

 Vogel u. s. w. — Podoa is associated "witb Fulica, in the order Natatores. 



1848. Gray, G. E. Description of a new species of Podica [P. personata]. <; P. Z. S., 



xyi, 1848, p. 90. 



1849. Gray, G. E. Description of a new species of Podica [P. personata]. < Ann. 



Mag. Nat. Hist. , 2d ser. , iii, 1849, pp. 311, 312. 

 Prom P. Z. S., June 13, 1848, p, 90. 

 1861. GiEBEL, C. G. Ueber Podoa surinamensis. <^Zeit8ch.f. d. gesammt Natwrwisa., 



xviii, 1861, pp. 424 . 



Nicht mir selbst zuganglich. — ^Enthaltend anatomisches. 

 1867. SCHLEGEL, H. Urinatores <^Mus. Hist. Nat. Pay s-Bas, 9^ livr., avril 1867, pp. 

 1-52. 



This group, as made up by the author, consists of the five families Spheniscidce, Alddce, 

 Golymbidce, Podicipidce, and Heliornithidce, of three of which only a single genus is admitted. 

 SpJieniscus, 12 species. 



In the Alcidce, with 3 genera, are treated of Alca, 9 spp. ; Simorhynchus, 6 spp. ; Lunda, 3 

 spp. Golymbus, with 3 spp. Podiceps, with 12 spp. Hdiornis, with 3 spp. 



