Davenport. — Budding in Bryozoa. 



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 the interrelations of individuals in stock shown in 



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



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



right ; a', b', branches given off to the left ; a, $, etc., lateral branches 



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



ancestral branch ; a, j8', 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 tlie bud of the 



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

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



than in Figure 3. X G05. 

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



of ceils at ex. to form inner layer of bud. X fi35. 

 Fig. 6. Longitudinal section of tip of branch to show cell structure. Zeiss, -^^ 



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, slinwing relations of young bud, 



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



shrunken. X 87. 



