1910.] ON HYDROIDS AND NUDIBRANCHS OP BERMUDA. 137 



4. Notes on the Hydroids and Nudibranchs o£ Bermuda *. 

 Bj Prof. W. M. Small wood, Syracuse University f- 



[Received November 15, 1909.] 

 (Text-figures 7-10.) 



The writer spent the month of January 1909 in Bermuda, 

 studying at the Biological Station on Agar's Island. The courtesy 

 of the use of the Station was extended to me by the director, 

 Professor E. L. Mark, to whom I express my thanks. The 

 specific problem of research was an inquiry into the condition of 

 the living nerve-cells of nudibranchs ; but in addition some 

 observations were made that may be worth recording. 



Hardly a day passed that one or more Aurelia were not seen. 

 Most of the specimens were small and none showed mature gonads. 

 Vast quantities of sargassum were blown on to the various islands, 

 and on all of this the common summer hydroids were found. 

 Specimens of Clytia simplex and some unidentified campanularians 

 were repeatedly examined, but on none of them were -gonothecse 

 present. Aglaophenia minuta was taken the latter part of January 

 with many empty gonosomes ; but other than this the hydroids 

 on the sargassum did not show any signs of sexual activity. 



Lytocarpus philippiims was in a very active healthy condition 

 during the month and showed plenty of vitality by forming 

 numerous asexual branches, but no gonosomes were noted. 

 Congdon (07) speaks of slight variations from Nutting's descrip- 

 tion, in that "the colony [isj shorter." All of the colonies 

 collected by us were at least eight inches high and some of them 

 nearly a foot. They were taken in shallow water off Fairy-land 

 Point. 



Eudendrium hargitti was taken at Hungry Bay the last week 

 in January. Two large colonies, about three inches high, were 

 found ; one of them was in fruit, the orange-coloured gonophores 

 being very conspicuous. 



One new hydroid, which has been handed to Professor Hargitt 

 for description, was found growing on Zoobotryon pellucidus. 



The writer regretted very much that the wea/ther was 

 unfavourable for collecting in Castle Harbor, where further oppor- 

 tunity would have been afforded to study the winter conditions 

 of Pennaria and other hydroids. 



Chromodoris zebra Heilprin. (Text- fig. 7.) 



This is one of the largest nudibranchs of Bermuda. It was 

 first described, briefly, by Heilprin (89. p. 187, pi. 15. figs. 3, 3a), 

 as follows: — "Animal of the form typical of the genus; head 

 portion considerably extended and expanded in motion ; caudal 



* Contribution from the Bermuda Biological Station for Research, No. 18, and 

 from the Zoological Laboratory of Syracuse University. 



f Communicated by Dr. P. Chalmers Mitchell, M.A., D.Sc, F.R.S 



