On Bermudian Species 0/ Donatia (Tethya). 11 



Nyasaland : Mt. Mlanje (£. A. Neave — type). S. Rho- 

 desia : Sebakwe (D. Dudds). Transvaal: Pretoria. 



EXPLANATION OF PLATE I. 



Sphriyodes yunni, Marshall, X 9. 

 Deirudoynathus fasciatus, Marshall, X 4. 

 Cylindrobaris ornata, Marshall, X 5. 



II. — Bermudian Species of Donatia (Tethya). 

 By Blanche Benjamin Croziee. 



[Contributions from the Bermuda Biological Station for 



Research. — No. 77.) 



A SEARCH for budding sponges in the waters about Bermuda 

 lias revealed, in addition to members of other genera, three 

 species of Donatia — D. lyncurium, D. seychellensis, and two 

 varieties of D. ingalli. All, with the exception of D. lyncu- 

 rium, which is comparatively rare, have been obtained in 

 great abundance throughout their respective budding seasons, 

 and kept under observation in their natural situations from 

 September 1st to the end of May. These observations were 

 made as a preliminary to a study, now in progress, of the 

 germ cells of these sponges. I have enjoyed the use of 

 certain equipment belonging to the Bermuda Biological 

 Station, and from the Resident Naturalist of the Station, 

 Dr. W. J. Crozier, I have constantly received assistance. To 

 the Smithsonian Institution I am indebted for the loan of a 

 collection of identified material. 



I. Donatia seychellensis (E. P. Wright). 



During the first week in September Donatia seychellensis, 

 in moderate numbers, was found attached to the vegetation in 

 Millbrook and Fairyland Creeks. These creeks are long- 

 narrow inlets bordered by mangroves. They are very shallow, 

 and a large part of the bottom is covered with plants, flat- 

 bladed " eel-grass " or turtle-grass, round-bladed grass, and 

 algse. The sponge attaches itself to the grass by rather 

 slender anchoring filaments ; in its most common position 

 upon a round blade it sends out two principal filaments in 

 opposite directions along the length of the blade, and from 

 its base a few tiny hairs straight toward the blade. It n ay 



