SANDERL1NG PLOVER. 
359 
Plover, which are in Mr Peale’s collection. These birds 
corresponded with the subject of this article, except in the 
feet, and here I found a difference which is worthy of note. 
The outer toes of both the European and the American birds, 
were united to the middle ones by a membrane of an equal 
size ; but the inner toes of the latter were also united by a, 
smaller web, while those of the former were divided to their 
origin . The naturalists of Europe state, that the inner toes 
of their species are thus divided. Here, then, is a diversity, 
which, if constant, would constitute a specific difference.. The 
bottoms of the toes of the present are broad as in the 
Sanderling. 
“ The Plover given in our fifth volume, under the name of 
Hiaticula , has its inner toes divided to their origin ; and the 
web of the outer toes is much smaller than that of the present 
article. All my doubts on the subject of our two Plovers 
being now removed, I shall take the liberty of naming that of 
the fifth volume, the Piping Plover, Charadrius melodus.”~\ 
SANDERLING PLOVER.— CHARADRIUS CALIDRIS. 
Plate LIX. Fig. 4. 
Linn. Syst. 255. — Arct. Zool. p. 486, No. 403. — Le Sanderling, Buff. vii. 532. — . 
Bewick , ii. 19. — Peale's Museum , No. 4204. 
CALIDRIS ARENARIA. — Illiger.* 
Charadrius calidris, Wils. Isi edit. vii. p. 68. ; and Ch. rubidus, Wils. ls£ edit. vii. 
p. 129 — Calidris, Illig. Prod. Mam. et Av. p. 249. — Ruddy Plover, Penn. Arct. 
Zool. ii. p. 486; summer plumage — Sanderling variable, ( Calidris arenaria,) Temm. 
Man. d' Orn. ii. 524 Tringa (Calidris) arenaria, Bonap. Synop Calidris 
arenaria, Flem. Br. Zool. p. 112 — North. Zool. ii. p. 366. 
In this well known bird we have another proof of the 
imperfection of systematic arrangement, where no attention is 
paid to the general habits, but where one single circumstance 
* Calidris was established for this single species, common over the world, 
and of form intermediate between the Plovers and Sandpipers. Their make 
is thicker ; they are less slender than the Sandpipers ; the bill stronger, but, as 
