PROCELLARIID^. 217 
December 1852. It occurs regularly in winter in the 
Straits, though not commonly. 
Total length about 24 to 25 inches, wing 16. 
Family Pkocellariid^. 
323. PuFFiNUs KUHLi, Boic. Cinereous Shearwater. 
This species of Shearwater is abundant in the Straits, and 
is occasionally found dead on the shore. They nest about 
the beginning of May, under rocks and stones on islands. 
I regret to be unable to give any information about the 
Shearwaters, except that there appears to me to be a third 
species frequenting the Straits, which I could not obtain. 
I often went out to try and shoot these birds ; but though 
frequently within shot when in a steamer, I never could o-et 
a chance when trying for them in a boat as is usual in such 
cases. 
324. PuFFiNUs ANGLORUM, Tcmm. Manx Shearwater. 
Favier states that this Shearwater is " found from Auo-ust 
to November, and usually picked up dead on the sea-shore." 
It is common in the Straits in autumn, occasionally coming 
close in to the land in the Bay of Gibraltar. 
Head, back, wings, and tail blackish brown. 
Total length about 14-5 inches, wing 9-5. 
325. Thalassidroma pelagica (Linn.). Stormy Petrel. 
This little Petrel is frequently seen skimming about in the 
Straits, and, no doubt, nests on some of the small islands or 
patches of rock on the coast. 
Total length 5-5 inches. Tail almost square in shape. 
326. Thalassidroma leucorrhoa, Vieillot. Fork-tailed 
or Leaches Petrel. 
This species is stated by Favier to be of rare occurrence in 
the Straits. Those which he obtained were all found dead 
on the sea-shore after storms. He mentions picking up six 
in 1846, and one in each of the years 1852, 1854, and 1858. 
The tail is deeply forked. Total length about 7-25 inches. 
