266 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Family Gruoriaceae 

 Petrocelis sp. 



A few sterile examples of a Petrocelis species have been noted on the 

 surface of rocks from various stations in the Gulf. We shall have to await 

 the detection of fertile material before determination can be made. 



Family Gorallinaceac 



Genus LITHOPHYLLUM Philippi 



Lithophyllum pallescens (Foslie) Heydr. 



Plate 55, Fig. 4 



Heydrich, 1901, p. 531. Lithothamnion racemus Hariot, 1895, p. 169 (in 

 part), not of Lamarck. Lithothamnion pallescens Foslie, 1895, p. 

 4, figs. 11-13; 1897, p. 13; 1901, p. 20; 1909, p. 36; 1929, pi. 

 LXIV, figs. 15-17; Lemoine, 1911, pp. 156-158, figs. 87-91. 

 Goniolithon ? pallescens Foslie, 1898, p. 9. Lithothamnion (Lepi- 

 domorphum) pallescens Foslie, 1901, p. 20. Lithophyllum calif or- 

 niense Heydrich, 1901, p. 530. 

 Lemoine has given (1911) a fine account of the anatomy of this plant 

 as well as a description of its habit and distribution. According to a map 

 made by M. Diguet and transcribed by Madame Lemoine, the type lo- 

 cality of this species is found to be along a sublittoral bank off the west 

 shore of the main body of Espiritu Santo Island rather than in La Paz 

 Bay proper. It abounds in great quantity on the pearl-fishing banks and is 

 known by the natives as chicaron. Recent collections have been made in 

 this region and have yielded specimens identical with those of the type 

 collection, part of which is preserved in the Herbarium of the University 

 of California. D. 572 was collected from the bottom of the shallow la- 

 goon of San Gabriel, Espiritu Santo Island. D. 593b, in 12-26 m. in San 

 Lorenzo Channel. No other specimens can positively be assigned to this 

 species, which would seem to be confined to warm waters in the Gulf. Of 

 this species Foslie says, however (Sib. Exp., 1904, p. 33), "Lithophyllum 

 pallescens Fosl. (including L. calif orniense Heydr.) from the Gulf of 

 California is so closely allied to Lithophyllum Okamurae from the Pa- 

 cific coast of Japan and several places in the Malay Archipelago, that the 

 limit is hardly to be drawn." 



Lithophyllum ? Margaritae (Hariot) Heydr. 



Heydrich, 1901, p. 530; Lemoine, 1911, pp. 173-175, f^g. 100. Litho- 

 thamnion Margaritae Hariot, 1895, p. 167. Lithothamnion ele- 



