51 
~ A’ winter visitant in the British Isles, particularly during hard 
weather ; its true habitation, however, is within the arctic circle. In 
Iceland it also occasionally breeds. 
Lives well and is prolific on large pieces of water, in a semi- 
domesticated state; sitting six weeks, and laying from four to six 
eggs of a greenish colour. 
- The trachea in this species perforates the keel of the sternum 
deeply in a vertical direction. 
SARKIDIORNIS REGIUS. 
Sar.—Supra niger-zeneus, subtus albus; mas. caruncula magna 
culmine rostri. 
BLACK-BACKED GOOSE. 
Goose with the upper part brassy-black; below white; the male 
with a large caruncle at the base of the bill. 
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Bill black, with a large caruncle on the culmen; head and neck 
white, spotted with metallic green; under parts white, and wings 
purplish black, glossed in some lights with brassy, a band of black 
extending from the back to the posterior part of the thighs; wings 
with a knob; lower part of the back white; tail coverts black. 
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Bill without the caruncle, colouring similar, but with the white 
more or less tinged with brown, and without the band of black 
behind the thighs; bill and legs in both black. 
ANAS VEGiA siverecevevsesessererere Gel. Syst. Nat. 1. 508. 
Lath. Ind. Orn. 2. 847. 
Moll. Mist. du Chili. p. 212. 
CAVING... esveevveccreeescevcccesees Steph. in the Zool. vol. 12.82. 
ANAS MELANOTUS «2+ seeserseesss 05 Gmel. Syst. Nat. 1. 508. 
Lath. Ind. Orn. 2. 839. 
