34 DAVENPORT ACADEMY OF SCIENCES. 



Often myriads of detached clusters of the species may be seen 

 rolhng through the water in the fashion of J 'o/vox. The chisters 

 are composed of zooids from a few in number to fifty or sixty 

 bound together rosette-Hke by some substance which disintegrates 

 very quickly under the action of chemicals. 



Each zooid is more or less transparent, has a nucleus, contrac- 

 tile vesicle and two flagella unequal in length and, for a time at 

 least, can lead an independent existence. Large clusters break 

 up into small groups of four or five zooids and by longitudinal 

 fission of these the normal size of the cluster is again reached. 



Sometimes a number of clusters are found attached to the ter- 

 minations of a branched stalk. This pedicle is a product of excre- 

 tion and is longitudinally striated. In older stages the stalks are 

 dark brown in color and may be seen in large tangled masses 

 devoid of zooids. Fig. 47, PI. VII, represents a detached cluster 

 and Fig. 48, PI. VII, shows the branched pedicle with clusters of 

 zooids attached. 



Found nearlj' everywhere in stagnant and fresh water. 



Order, CH0AN0FI.AGF:I.LIDA. 

 Family, CRAvSPEDOMONADID.^. 



CODOSIGA James-Clark. 



Animals forming a colony, usuall}^ attached by means of a 

 branched, rigid stalk. Bodies oval or spherical with a prominent 

 collar. Flagellum single. 



CODOSIGA BOTRYTUS Ehr. 



Bodies ovate, zooids few in number, attached to the extremity 

 of a long, slender, rigid pedicle. Flagellum long. Collar equal- 

 ling the body in length. Nucleus spherical, centrally located. 



Length of body, 10-15 microns. (Fig. 49, PI. VII.) 



In this species the zooids appear to be attached to the pedicle 

 by means of short secondary branches, but these, according to 

 Kent, are but the extensions of the posterior regions of the 

 zooids and during longitudinal fission also undergo division. 



The same authority reports another interesting phenomenon 

 exhibited by Codosiga botrytus, stating that before passing into 

 the encysted state the zooids become amoeboid, pseudopodia-like 

 processes being projected from the body and even from the collar. 



