308 University of California Publications in Zoology  \Vor. 18 
20 on proximal, the proximal barbules being set at a much more 
acute angle with rami than are distals. Dzustal barbules (pl. 18, 
fig. 14a) moderate in size, the base being about 0.23 mm. long, 
pennulum about 0.45 mm. Base narrowed only slightly proximal 
to ventral teeth, and twist between base and pennulum not pro- 
ducing sharp curve in dorsal contour. Ventral teeth lobate in form, 
rather angular, and not smoothly rounded. Hooklets usually 5 in 
number, relatively short, but progressively becoming longer, their 
broadened middle portion drawn out and flattened, often with a 
tendency to give off a short prong. Ventral cilia long, curved, and 
not very flexible. Proximal 2 or 38 dorsal cilia broad and lobate, 
rather angular in shape, these followed by a few slenderer, spiny 
ones, the more distal ones more and more rudimentary. Proximal 
barbules (pl. 18, fig. 146) with long, slender base about 0.6 mm. 
by 0.04 mm. Ventral teeth 4 or 5 in number, long and pointed, 
but not drawn out into wavy filaments as in Procellariiformes; 
pennulum slender and filamentous, shghtly shorter than base. 
Outer vane.—Distal barbules (pl. 18, fig. 14c) differ from those 
of inner vane in ordinary ways; shorter base, more numerous 
hooklets, and more proximal dorsal cilia undeveloped. Proximal 
barbules (pl. 18, fig. 14d) on basal portion of barbs resemble those 
of inner vane, but on distal half, more or less, ventral teeth sep- 
arate from one another, increasing in number, and develop into 
hooked barbicels, which are shorter and have stouter hooks than 
those of the Procellariiformes (compare plate 18, figure 14d with 
plate 17, figure 10d). 
(2) Other Feathers 
In upper back feathers of females and young, distal barbules 
nearer type of outer vane of remiges, with narrow elongate base, 
two small, lobate ventral teeth, a long, broad pennulum with a 
double series of cilia, dorsal ones best developed towards tip, but 
never as well developed as the long, filamentous ventral ones. Pen- 
nula of barbules near middle of barbs longest, giving brown velvety 
effect to plumage (pl. 18, fig. 14e). Black edgings of feathers due 
both to imperfections of development and to subsequent wearing 
away of long pennula of distal barbules. Proximals with slender 
tapering base, about 0.4 mm. long, and much elongated slender 
pennula, about 0.8 mm. in length, with weak hooked cilia at bend, 
followed by some scattered, simple, filamentous ones (pl. 18, fig. 14/). 
Near base of barbs both proximal and distal barbules closely resemble 
those of remiges. 
Dark glossy green feathers of adult male have elongated, weak 
barbules near base of barbs, the distals with an even series of short, 
hooked ventral cilia, reminiscent of penguins and loons. Glossy 
green portion produced by simple, rodlike barbules, slightly flat- 
tened, and with refractory surface. 
Breast feathers have outer part of barbs furnished with weak, 
reduced barbules, entirely non-coherent, basal portion being well 
developed; distal barbules with long, narrow base, reduced ventral 
teeth, trapezoidal in shape, and elongate pennula, the latter with 
3 or 4 short hooklets, and a complete series of short, curved, ventral 
