Davenport. — BudJing in Kryozoa. 



PLATE I. 



ABBREVIATIONS. 



All figures are of Paludicella Ehrenbergii. 



Fig. 1, Stock of Paludicella Ehrenbergii, viewed as an opaque object. X 4.5. 

 Fig. 2. Diagram representing tlie interrelations of individuals in stock shown in 



Figure 1. A-FI are individuals of the ancestral (median) branch; 



a, b, c, etc., lateral branches given off from the ancestral branch to the 



right ; a', I/, branches given off to the left ; a, )3, etc., lateral branches 



of second order given off in tlie direction of the distal end of the 



ancestrnl branch ; a, /8', etc., given off in the direction of proximal end ; 



aj', lateral branches of third order — to left. 

 Fig. 2"^. Diagram of another (smaller) stock. Letters have same significance as 



in foregoing. 

 Fig. 3. Cross section of branch near tip, showing the first trace of the bud of tlie 



polypide at e.r., i. X 635. 

 Fig. 4. Cross section of brancli near tip, showing bud of polypide slightly older 



than in Figure 3. X 685. 

 Fig. 5. Cross section of slightly collapsed branch near tip, showing ingression 



of cells at ex. to form inner layer of bud. X 635. 

 Fig. 6. Longitudinal section of tip of brancli to show cell structure. Zeiss, jij 



oil immersion, Oc. 1. X 1000. 

 Figs. 7, 8, 9. Optical sections (nearly in sagittal plane) of three tips of branches 



in successive stages of development, showing relations of young bud, 



gm., to next older polypide. In Figure 8 the branch is slightly 



siirunken. X 87. 



