792 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Genus LUNDA Pallas. 
Lunda Pattas, Zoogr. Rosso-Asiat., ii, 1826, 363. (Type as fixed by Gray, 1840, 
Alca cirrhata Pallas.) 
Gymnoblepharum Branvt, Bull. Sci. St. Petersb., ii, 1837, 349. (Type, Alca 
cirrhata Pallas.) 
Sagmatorrhina Bonararte, Proc. Zool. Soc. Lond., 1851, 202. (Type, 8. lathami 
Bonaparte=Alca cirrhata Pallas.) 
Sagmatorhina (emendation) Bonaparte, Ann. Sci. Nat., (4), i, 1854, 144. 
Cheniscus (not of Eyton, 1838) Gray, List Gen. and Subgen. Birds, 1855, 127. 
(Type, Alca cirrhata Pallas.) 
Large Fraterculine (wing 179-206 mm.) with the deciduous nasal 
cuirass broadest toward culmen, where surmounted by a broadly 
rounded ridge, its anterior outline concave; maxillary grooves 
nearly vertical, concave distally; basal lamina of maxilla much 
broader below than above; eyelids without tumid appendages, and 
head with conspicuous, elongated and decurved postocular plumes. 
Bill very large and deep, its depth from base of culmen to gonydeal 
angle at least equal to distance from posterior end of nostril to tip of 
maxilla, the culmen (from frontal feathering) as long as or longer than 
middle toe with claw (in adults); nasal cuirass much broader above 
than below, its anterior outline strongly concave, surmounted on top 
by a broad, rounded, and much thickened, slightly arched ridge, 
in line with culmen; basal lamina of maxilla much wider below than 
above, minutely punctulated; sides of maxilla (in front of nasal 
cuirass) with two to three nearly vertical grooves, slightly concave 
distally, the sides of mandible without grooves; gonys nearly straight, 
strongly ascending terminally, its basal angle very prominent through 
contraction of the mandibular rami, its length equal to distance from 
posterior end of nostril to tip of maxilla in breeding adults, much 
less in winter adults and young; maxillary tomium strongly and 
abruptly reflexed basally, nearly straight thence to the strongly 
incised terminal portion, the tip of maxilla strongly uncinate; man- 
dibular tomium slightly but distinctly recurved distally, the tip of 
mandible obliquely and broadly truncate; nostril longitudinal, curved- 
linear, the upper edge concave, the lower convex; a tumid rictal 
rosette, conspicuous in breeding season, much less so in winter. 
Wing moderate, the longest primaries (two outermost) exceeding 
distal secondaries by about half the length of wing. Tail about one- 
third as long as wing, double-rounded, the lateral rectrices much 
shorter than middle pair. Tarsus about as long as distance from 
posterior end of nostril to tip of maxilla, or slightly less (equal to 
combined length of first and second phalanges of middle toe), for the 
greater part reticulate, but the acrotarsium transversely scutellate 
(mostly on inner side); outer toe (without claw) as long as middle 
toe (without claw), or very slightly shorter, the inner toe as long 
as first two phalanges of middle toe; claws rather large, that of the 
