2 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 16 



noted by Durham, Pourtales (1875) recorded the first corals from the 

 Galapagos, and Vaughan (1906) described some additional material 

 from the same region. Duncan (Proc. Zool. Soc. London, 1876, pp. 441- 

 442) described Placopsamfnia (now Lobopsammia) darwini from the 

 Galapagos Islands. 



We wish to express our apprecation at this time to Captain Allan 

 Hancock, director of the Foundation, for the opportunity to study and 

 report on the stony coral material, and to Dr. Irene McCulIoch for her 

 interest and help in preparing this paper. Dr. John W. Wells has kindly 

 aided in the identification of three of the genera. We also wish to thank 

 Dr. Stanley C. Ball of the Zoological Division of the Peabody Museum 

 of Natural History, Yale University for the loan of A. E. Verrill's 

 type material of three species of Astrangia, of which lectotypes are de- 

 signated herein. The writers are indebted to Mr. Daniel H. Chapman 

 for making the photographs. 



Composition and Relationships of the Eastern Pacific Fauna 



Table 1^ shows that the Eastern Pacific coral fauna now consists of 

 98 living species representing 39 genera. Of these species 6 are as yet 

 indistinct, the material not being satisfactory for full analysis. The "addi- 

 tional coral genus" of Crossland (1927, p. 537) will probably never be 

 identified and might represent either an as yet undescribed species, or 

 it might be one of the new forms here recorded. As a result it is not 

 included in the above figures. Crossland's Psarnmocora sp. is here re- 

 placed in the tables by P. (Stephanaria) stellata (Verrill). 



Of the total number recorded, twenty-five species and one genus are 

 here described as new, while nine species are recorded from this area for 

 the first time. In addition, fourteen genera and one subgenus are added 

 to the previously known 25 occurring in the Eastern Pacific. 



The 98 species are distributed thus: North Pacific Coast, 19 species 

 in 12 genera, with one species also occurring in the Panamic fauna, and 

 one in the Gulf of California; Gulf of California, 34 species in 18 genera 

 with 16 species common to the Panamic fauna; 16 species are restricted 

 to the Gulf, and 5 species are common to both the Panamic and the 



1 In compiling Table 1, the North Pacific area includes all records from Cape 

 San Lucas northward along the outer coast; the Gulf of California area is 

 restricted to the region within the Gulf of California proper; the Panamic area 

 extends southward from the Gulf of California to about the latitude of the 

 Peruvian-Ecuadorian border, and includes all offshore records in these latitudes 

 except for those in the Galapagos Islands region; the Galapagos Islands area is 

 restricted to the Galapagos high, a large share of which lies in depths of less 

 than 200 meters, with the remainder largely less than 500 meters in depth, while 

 the entire region is separated by depths of more than 3000 meters from the South 

 and Central American mainlands. 



