On a New Species of Corymorpha 

 from Japan 



(C. tomoensis). 



BY 



Dr. Iwaji Ikeda. 



Higher Normal School, Hiroshima. 



(With Plate V). 



During a short sta}'', in September of 1907, at Tomo in the 

 Province of Bingo, about fifty specimens of a solitary hydroid of the 

 genus Corymorpha were collected by me by means of a trawl. 

 Through assistance of Mr. A. Izuka of the Tokyo Imperial University 

 and of Dr. H. B. Torrey of the California University, I was enabled 

 to ascertain that this form is new to science. It is my pleasant duty 

 here to express my hearty thanks to both the gentlemen for their 

 kindness rendered me. I also owe a great obligation to Mr. Arii, 

 post-graduate of the Hiroshima normal school, who assisted me not 

 only in collecting the material but also in investigating the mode of 

 budding, the discovery of which should be credited to him. 



Corymorpha tomoensis n. sp. 



The general aspect of the entire hydrosomc (Fig. 1) bears a great 

 deal of resemblance to that of Corymorpha nutansP The measure- 

 ments of the larger individuals in the fresh state are as follows : 



Total height of the hydrosomc 40- 50 mm. 



Height of the hydranth 8-10 mm. 



Maximum breadth of the hydranth 4.5 mm. 



Maximum breadth of the hudrocaulus 3-4 mm. 



According to Allman's description, C. nutans seems to be a little 



11 AUman, G. J., — A. Monograph of the Gymnoblastic or Tubularian HydrouU. (1S71). 



