4 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



GENERAL DESCRIPTIONS OF 

 LOCALITIES 



Baja California, Mexico 



I. Cerros^ 



Lying west of Ba. Sebastian Viscaino about halfway down the coast 

 of Baja California is the rather large island sometimes designated I. 

 Cerros and sometimes I. Cedros. It is characterized by high, steep hills 

 with sharp ravines, and reddish rock, especially on the heights. The shore 

 is abrupt and for the most part rocky. The Hancock Expeditions of 1934 

 and 1939 both stopped at the island. On the first occasion the vessel lay 

 in South Bay and a considerable collection of algae was made. In 1939 it 

 stopped at a small settlement about a cannery on the southeast end of the 

 island. There was little opportunity to collect algae on this occasion, and 

 only a few Myxophyceae were secured about the landing place. 



On the earlier occasion an abundant flora probably similar to that of 

 the southern California coast was noted. The tidal range was considerable 

 and the surge moderate. The rocks showed a notable belt of pink coralline 

 algae and numerous large types. Conspicuous Chlorophyceae were absent, 

 but the Phaeophyceae were represented by large clumps of Halidrys dioica 

 and many scattered plants of Eisenia arborea, and offshore by Macrocystis 

 pyrifera. The larger Rhodophyceae present in quantity were mostly of 

 Prionitis and Gigartinaj especially G. armata. The important genus 

 Gelidium was represented by the larger bushy types G. densum and G. 

 cartilagineum. In the coralline zone on the rocks there were several species 

 of Corallina, Amphiroa and Bossea, besides small crustaceous types, but 

 no large crustaceous or bushy Lithothamnieae were secured, though no 

 doubt had time permitted some would have been found by further search. 



Bahia Thurloe^ 



The landing party from the Hancock Expedition of 1934 passed 

 through very considerable kelp beds (Macrocystis) off the shore of Ba. 

 Thurloe near Pto. San Bartolome. The shore itself consisted of a broad 

 shelf of rough bedded rock which extended in until it met a series of cliffs 

 about 50 feet high, at the base of which there was a mass of tumbled rock. 

 The shore did not have very good tide pools. In shallow water young 



2 For description and illustrations see Fraser 1943b, p. 65, pi. 31, fig. 69, pi. 32. 



3 Ibid., p. 67, pi. 33, fig. 72. 



