778 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
[Simorhynchus] tetraculus Gray, Hand-list, iii, 1871, 97, ‘no. 10782.—CovEs, Key 
N, Am. Birds, 1872, 342. 
Alea cristata Miter, Natursyst., Suppl., 1776, 104. 
Simorhynchus cristatus Merrem, in Ersch u. Gruber’s Encycl., ii, 1819, 406. 
Uria dubia Pauuas, Zoogr. Rosso-Asiat., ii, 1826, 371, pl. 87 (young). 
Phaleris dubia Branpr, Bull. Ac. St. Petersb., ii, 1837, 347. 
Pfhaleris] dubia Gray, Gen. Birds, iii, 1848, 638. 
Alca dubia Krrtirrz, Denkw. Reise, i, 1858, 300 (St. Paul Island, Pribilof group). 
Symorhynchus dubius Couzs, Proc. Ac. Nat. Sci. Phila., 1868, 40 (monogr.). 
Phaleris superciliosa (not Mormon superciliosa Lichtenstein) Bonaparte, Geog. 
and Comp. List, 1838, 66. 
Phaleris superciliata AUDUBON, Birds Amer., folio ed., 1838, pl. 402, fig. 
Phaleris mystacea (not Uria mystacea Pallas) Buaxiston and Prrer, Ibis, 1878, 
210, part (Kuril Islands; Shimoda and Tokyo Bay, Japan).—SzzBonm, 
Ibis, 1879, 21. 
Genus CERORHINCA Bonaparte. 
Cerorhinca Bonaparte, Ann. Lyc. Nat. Hist. N. Y., ii, 1828, 427. (Type C. 
occidentalis Bonaparte—=Alca monocerata Pallas.) 
Ceratorrhina (emendation) Bonaparts, Oss. Régne Anim., 1830, 134; Saggio, 
1831, 62. 
Ceratorhina (emendation) AupuBoNn, Orn. Biog., v, 1839, 104. 
Cerorhina (emendation) Branpt, Bull. Sci. St. Petersb/, ii, 1837, 348. 
Ceratorhynchus (emendation) SUNDEVALL, Orn. Syst., 1836, 130. 
Ceratorhyncha Bonaparte, Geog. and Comp. List, 1838, 66. 
Chimerina EscuscHourz, Zool. Atlas, iii, 1829, 2, pl. 12. (Tpye, C. cornuta 
Eschscholtz=Alca monocerata Pallas.) 
Large Phalerine (wing 169-183 mm.) with relatively long bill 
(the distance from nostril to tip of maxilla nearly if not quite equal 
to length of tarsus), with 16-18 rectrices, and adults in breeding 
season with a conspicuous vertical compressed, knob at base of culmen. 
Bill, from rictus, nearly as long as head, much compressed, its 
width at anterior end of nostrils only about half its depth at same 
point and equal to not more than one-third the distance from nostril 
to tip of maxilla; culmen, from anterior edge of supra-nasal horn 
or saddle, decidedly shorter than tarsus, but more than half as long 
as commissure, strongly and regularly curved; gonys shorter than 
distance from nostril to tip of maxilla, faintly concave, its basal 
angle very prominent; maxillary tomium faintly convex sub-basally, 
decidedly concave distally, distinctly notched near uncinate tip of 
maxilla; mandibular tomium slightly but distinctly convex distally, 
distinctly notched near tip of mandible; nostril longitudinal, slit-like 
in extreme lower edge of nasal fossa, or in breeding season beneath 
lower edge of the corneous nasal cuirass; frontal antia about on line 
(vertically) with posterior end of nostril, the mental antia about on 
line with middle of nostril, the indistinct malar antia (at lower edge 
of ramus) about on line with frontal antia, or slightly posterior to it. 
