308 University of California Publications in Zoology IVor. 13 



20 on proximal, tlii^ proximal barbules being set at a much more 

 acute aug-le with rami than are distals. Distal hay'hules (pi. 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 pciniulum 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 3 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 

 harhulcs (pi. 18, fig. 14&) 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 Procellariif ormes ; 

 pennulum slender and filamentous, slightly shorter than base. 



Outer vane. — Distal harhules (pi. 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 (pi. 18, fig. 14:d) 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 Procellariif ormes (compare plate 18, figure 14cZ with 

 plate 17, figure lOd). 



(2) OtJier Feathers 



In upper hack 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 raiddle of barbs longest, giving brown velvety 

 effect to plumage (pi. 18, fig. 146). 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 (pi. 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 booklets, and a complete series of short, curved, ventral 



