ILLUSTRATIONS 



PLATES 

 Marine Diatoms of the Philippine Islands 



By Albert Mann 



Page 



1-39. Diatoms of the Philippine Islands 182 



Report on the Hydroida Collected by the United States 

 Fisheries Steamer "Albatross" in the Philippine Region, 

 1907-1910 



By Charles C. Nutting 



40. New species of Stegopoma and Hebella 242 



41. New species of Acryptolaria, Zygophylax, and Dictyocladium 242 



42. Gonosomes of Sertularella and Diphasia 242 



43. New species of Diphasia and Plumularia 242 



44. New species of Plumularia and Antennella 242 



45. Gonosome of Acanthella and a new species of Antennopsis 242 



46. New genus Stechowia and new species of Aglaophenia 242 



47. New species of Thecocarpus and Halicomaria 242 



Report on the Echinoidea Collected by the United States 

 Fisheries Steamer "Albatross" during the Philippine 

 Expedition, 1907-1910. Part 1. The Cidaridae 



By Theodor Mortensen 



48-80. Echinoidea collected by the Albatross 312 



The Philippine Land Mollusks of the Genus Opisthoporus 



By Paul Bartsch 



81. The Philippine species of Opisthoporus 327 



82. Relief map showing the distribution of Opisthoporus in the 



Philippines 327 



TnE Philippine Land Mollusks Cochlostyla rufogaster 

 and Obba marmorata and their races 



By Paul Bartsch 



83- 85. Races of Cochlostyla rufogaster 342 



86. 066a marmorata and its races 342 



The Land Shells of the Genus Obba from Mindoro Province, 

 Philippine Islands 



By Paul Bartsch 



87. Relief map of Mindoro Province, showing localities from which 



specimens of 066a were obtained 343 



88-89. Subspecies of 066a gallinula and O. listeri 371 



90. Forms of four species of 066a 371 



91-93. Subspecies of 066a mesai and O. planulata 371 



VI 



