290 



APPENDIX. 



No. XI. 



No. XL 



HYDROZOA. 

 BY GEORGE J. ALLMAN, M.D., LL.D., P.R.S., ETC. 



THE elegant little medusa here described was taken in the 

 towing-net by Captain Feilden in lat. 81 44' N. It is re- 



Fig. 1. Lateral view; magnified. 



PTYCHOGASTRIA POLARIS. 



markable among hydroid medusae by its lobed umbrella- 

 margin, which thus presents a character belonging to the 



