2126 The Zoologist— May, 1870. 



white along the edge of the fore-anu. Exposed portions of uing and 

 tail-feathers black ; their inner webs grayish brown, basally lighter, 

 the shafts of the primaries dull wliitish at base. A series of elongated, 

 stiffish, acicular feathers on the side of the head from the rictal angle ; 

 another similar series from the eye backwards to the sides of the nape, 

 pure white. The individual feathers are about an inch, more or less, 

 in length ; the length of the white stripes produced by thera 

 collectively is about two inches. 



Length 1550; wing 7-25; tail 2-50; tarsus I'SO; middle toe 

 and claw TSS ; outer do. 170; inner do. 1*40; chord of culmen, 

 excluding width of horn, rOO, including it 140 ; rictus 2*00; gonys, 

 including length of accessory piece, 1*10; height of bill from tip of 

 horn to protuberance at symphysis 125; from culmen at base of horn 

 to same '80 ; nostril to top of horn "75. 



Immature, but with a perfectly developed horn, and accessory 

 symphyseal piece (No. 23,391, Mus. Smiths., Straits of Fuca), — 

 Colours somewhat as in the preceding ; but the white of the under 

 parts everywhere obscured by ashy-gray, which tinges the tips of the 

 feathers, giving a marbled aspect to the parts, lightest on the middle 

 of the belly, shading insensibly on all sides into the uniform ashy gray 

 of the other under parts. Black of upper parts, especially on the 

 head, with a decided brownish tinge. Only traces of the acicular 

 white feathers on the sides of the head. Bill smaller than before; 

 the horn, however, perfectly developed, rising nearly half an inch 

 above the culmen. Rather smaller than the preceding; length between 

 14 and 15 inches, wing barely 7, bill along rictus 1'60, its depth at 

 base, exclusive of height of horn, '65. 



Young (No. 23,392, Mus. Smiths., Straits of Fuca). — This specimen 

 is just not quite fully feathered, patches of down adhering here and 

 there. The bill is small and weak, hardly more than half the size of 

 that of the adult : its general shape, however, is nearly attained. The 

 base of the upper mandible is covered with a soft skin, about as far as 

 the end of the nostrils. That part of the culmen formed by the ridge 

 of this skin is sunken below the level of the rest. Unmistakable 

 indications of the future horn are present, in a small knob on the ridge 

 of this skin. In the present dried state this knob is shrunken, pre- 

 senting the appearance represented in the plate. In life it was 

 probably a small full rounded protuberance, rising a little above the 

 level of the culmen. Between the mandibular rami, at the symphysis, 

 there is a slight fold or ridge of skin, evidently the matrix of the 



