abrador, June 23, 1884. Single egg
laid at end of burrow in the ground. Collector, J. H. Jameson.

13a. LARGE-BILLED PUFFIN. _Fratercula arctica naumanni._

A more northerly subspecies of the last, inhabiting the Arctic region on
the Atlantic side. The bird is somewhat larger but otherwise
indistinguishable from the common species. The eggs are exactly the same
or average a trifle larger. Size 2.55 x 1.80. Data.--Iceland, July 6,
1900. Single egg in hole under a rock. Collector, Chas. Jefferys.

14. HORNED PUFFIN. _Fratercula corniculata._

Range.--Pacific Coast from Alaska to British Columbia. The Horned Puffin
differs from the common in that the blackish band across the throat
extends upwards in a point to the bill. Their nesting habits are
precisely the same as those of the preceding species. A single pure
white egg is laid; the shell is slightly rougher than those of the
others. Size 2.65 x 1.80. Data.--Round Is., Alaska, June 24, 1884.
Single egg laid at end of burrow in ground; no nest. Collector, G. L.
Kennedy.

15. RHINOCEROS AUKLET. _Cerorhinca monocerata._

Range.--Pacific Coast, breeding from British Columbia northward and
wintering southward to Lower California.

The Rhinoceros Auklet or Horned Auk has a much smaller bill than the
Puffins; in the summer this is adorned at the base by a horn from which
it takes its name. There are also slender plumes from above and below
the eyes. Unlike the Puffins, these birds sit upon their whole tarsus.

They nest on islands of the North Pacific Coast from Vancouver
northward. A single egg is laid in crevices among the rocks or in
burrows in the ground. It is similar both in size and shape to that of
the Puffins, but is often quite heavily blotched with brown. Size 2.70 x
1.80. Data.--Unak Is., Alaska, June 30, 1900. Egg laid in a fissure of
the rocks; no nest. Collector, F. Weston.

[Illustration 025: White.]
[Illustration: right hand margin.]

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16. CASSIN AUKLET. _Ptychoramphus aleuticus._

Range.--Pacific Coast from Alaska to Lower California, breeding nearly
throughout its range.

A plain appearing bird about 9 in. in length, with blackish upperparts
relieved only by a white spot over the eye; breast and throat gray and
belly white. This Auklet is fairly abundant on the Farallones, breeding
on the lower portions of the island. The late Mr. C. Barlow says that it
is found in deserted rabbit burrows and in all probability often
excavates i