HYDROMEDUSAE, SIPHONOPHORES, AND CTENO- 

 PHORES OF THE "ALBATROSS" PHILIPPINE EXPE. 

 DITION. 



By Henry B. Bigelow, 



Of the Museum of Comparative Zoology, Cambridge, Massachusetts. 



INTRODUCTION. 



The medusae, siphonophores, and ctenophores described in the fol- 

 lowing pages were collected among the Philippines by the United 

 States Fisheries steamer Albatross during 1907-1910. The material 

 submitted to me consisted in part of specimens picked out on the 

 spot and separately preserved, in part of a very large amount of 

 unsorted plankton. The former were uniformly in good condition, 

 but such medusae as I was able to separate from the mass of crus- 

 taceans, sagittae, salpae, pteropods, etc., were all damaged, many of 

 them past recognition. For this reason and because time has allowed 

 only a superficial examination of the unsorted plankton, it is by no 

 means certain that the list includes all species which were taken. 

 The labels give no information as to the depths of capture of any of 

 the specimens; these have been obtained from the published data of 

 the expedition. 1 



As points of special interest I may point out the discovery of a 

 new Protiara (1912, p. 253), a new representative of Haeckel's genus 

 Zygocanna (1912, p. 255), a genus not recorded since 1879; and a 

 new genus of Petasidae of unusual morphological interest (1912, 

 p. 258). The collection as a whole affords the opportunity for a 

 discussion of the geographic affinities of the medusa-fauna of the 

 Malay-Philippine region. 



1 Dredging and Hydrographic records of the U. S. Fisheries steamer Albatross during 

 the Philippine Expedition, 1907-1910, U. S. Bureau of Fisheries, document 741, 1910. 



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