M. F. LINGER, DEL. 



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Hydroids from " Pentacrinus Ground." 



1. Sertularella gayi var. robusta. Alhiiari. 

 1«. FiLELLUM sp., a parasitic Hydroid. 



2. Sertularella Formosa. Fewkes. 

 2a. Gonang-ium of same. 



2l\ Lafcea venusta. Allmaii. 



3. Obella hyalina. Clarke (found on floating- sea-weed) 

 3(7. Magnified hydranth of same. 



4. Lictokella conv.^ll.aria (?) (Allman). 

 4a, f', c. Details of same. 



5. Sertularella qu.adr.ata. Nutting-. 

 ha. Mag-nifled hydrotheca of same. 



5^. Parasitic campanularian. 



