458 Forty-fifth Report on the State Museum. 



Glottidia Audebardi has been mentioned as a species in which 

 attachment exists at no stage of develop- 

 ment. The muscular pedicle of the 

 animal penetrates marine sediments and 

 gathers about itself a mass of agglutin- 

 ated grains of sand, fragments of shell 

 and bits of sea- weed, forming thus a dis- 

 tinctly free capsule or tube, after the 

 manner of many worms. This may be 

 regarded as a sort of attachment, as the 

 animal, after the formation of this tube, 

 is at no time free from it. 



In the genus Stkophalosia, the attach- 

 ment by the substance of the valve was 

 frequently aided by the long spines with 

 which the attached valve is furnished, 



Fig. 5.— Olottidia Audebardi ,i ji • ■ r x i 



(Morse). these adhering to, or embracing the 



foreign object. An individual of Strojphalosia radicans, having 

 become lodged in the cavity between the calyces of a compound 

 coral (Acervularia), has anchored itself essentially by its spines 

 alone, only the posterior edge of the valve coming into contact 

 with its host. ^ 



Fio. b — Strophalosia radicans, situated in a cavity between the calyces of Acervularia, and 

 attached by its spines. X 3. 



Etheridoe has described some small productoids {Etheridgina 

 complectens), which are attached to columns of crinoids by 

 the encircling of the spines, as though at some time these 

 spines had been flexible and prehensile organs. The same author 



10 



