AVES. 
267 
middle toe; three anterior toes having a rudimentary membrane, 
the exterior and middle one joined the length of the first joint; 
hallux long, placed high, the nail only touching the ground; 
wings of medium length, the first quill longest. 
Chionis Forsteri. — Sheath-Bill. 
• Plate LX. fig. 2. 
Snow-white ; bill, cheeks, and ophthalmic region, yellow; 
legs flesh-coloured ; nails black. Eighteen inches long. Inha¬ 
bits New Zealand. 
Qenus 3.—R H YN CIIO P S. — Linnaeus. 
Generic Character. —Bill long, flattened on the sides, and 
truncated at the apex in the form of a blade; the edges of the 
upper mandible approaching, and hollowed in the form of a 
gutter; under mandible much longer than the upper one ; nos¬ 
trils lateral, marginal, and remote from the base, and situated 
on the lower edge of the upper mandible; legs short; tibia 
partly naked ; anterior toes short, united to their points by a 
membrane ; hallux very short, articulated to the tarsus; claws 
short and curved; wings long, the first quill longest; tail short, 
furcated, and much shorter than the wings. 
Rhijnchops flavirostris. — Yellow-Billed Cut-Water. 
Plate LX. fig-. 3. 
Head, back, and wings, dusky-brown ; a longitudinal white 
•tripe along the wings; other parts of the plumage white ; 
oill and legs yellow. Eighteen inches long. Inhabits Senegal. 
Genus 4. — STERNA.— Linnaeus. 
Generic Character _Bill as long as the head, longer in some 
species, nearly straight, strong, and tapering; mandibles with 
sharp edges, equal in length, the upper one a little inclined to¬ 
wards the point; nostrils longitudinal, pervious, situated in the 
middle of the bill; legs short ; tibia partly naked ; tarsus short, 
three anterior toes connected by a membrane ; hallux short, 
placed high on the tarsus; tail forked; wings long and pointed, 
first quill the longest. 
Y 2 
