No. 3. — Reports on the Scientific Results of the Expedition to 

 the Eastern Tropical Pacific , in charge of Alexander Agassiz, 

 by the U. S. Fish Commission Steamer "Albatross" from 

 October, 1904, to March, 1905, Lieut. Commander, L. M. 

 Garrett, U. S. N., Commanding. 



VI. 



Madreporaria. By T. Wayland Vaughan. 1 



Mr. Alexander Agassiz has submitted to me for determination and 

 report the Madreporaria collected during the " Albatross " Expedition of 

 1904-1905. The collections are small, and represent only seven localities. 



Two species, Pocillopora lacera Verrill and Astrangia haimei Verrill, 

 were obtained from Taboguilla Island, Bay of Panama, the former at a 

 depth from low tide to 1 fm., the latter between tides. 



Three species were obtained in the vicinity of the Galapagos 

 Islands, viz. : — 



Madrepora galapagensis, sp. nov., depth 300 fms. 

 Desmophyllum galapagense 2 , sp. nov., depth 300 fms. 

 Balanophyllia galapagensis, sp. nov., depth 100 fms. 



One species, Bathyactis marenzelleri, sp. nov., was collected off Callao, 

 Peru, at a depth of 3,209 fms. The same species was obtained at Station 

 4721, about half way between the Galapagos and Garrett Ridge, at a 

 depth of 2,084 fms., and probably at Station 4732, southwest of Garrett 

 Ridge, at a depth of 2,012 fms. 



Two species, Pocillopora diomedeae and Porites paschalensis, both new 

 species, were collected on the shore of Easter Island. 



Five species, a variation of Pocillopora cespitosa Dana and four species 

 of Acropora, were obtained at Manga Reva. 



1 The Director of the U. S. Geological Survey has allowed me to prepare this 

 Report as part of my official work. 



a The name Desmophyllum galapagensis, on Plate 1 printed as originally pro- 

 posed, has been changed to the more correct D. galapagense. 

 vol. l. — no. 3 1 



