Davenport. — Budding in Br^ozoa. 



PLATE IV. 



ABBREVIATIONS. 



An. Anal side of polypide. i. 



an. Anus. lofjh. 



atr. Atrium. ms'drm. 



can. crc. Ring canal. jnu. 



ec'drm. Ectoderm. n.' 



ex. Outer layer of bud. a. 



fan. inf. Inferior funiculus. Or. 



fun. sup. Superior funiculus. rt. 



ga. Stomach. vac. 



gn. Ganglion. vlv. cr. 



Inner layer of bud. 



Lophophore. 



Mesoderm. 



Muscle fibre in funiculus. 



Circumoesophageal nerve. 



Esophagus. 



Oi-al side of polypide. 



Rectum. 



Vacuole. 



Cardiac valve. 



All figures from preparations of Paludicella Ehrenbergii. 



Fig. 30. Cross section of polypide bud of stage of Figure 24, Plate III. The posi- 

 tion is indicated by the line 30, Figure 24. X 410. 



Figs. 31-34. Four cross sections of a branch tlirough a young polypide, some- 

 what younger than that of Figure 25. Figure 31 is nearer the anal, 

 Figure 34 nearer the oral surface. In Figure 34 that part only of the 

 section of the polypide which lies near the body wall is represented. 

 X410. 



Fig. 35. Cross section of branch through polypide of age of Figure 25. To show 

 origin of tentacles and ring canal. X 410. 



Fig. 36. Sagittal section of young polypide at period of closure of ganglion, ^n. 

 X 410. 



Fig. 36*. Bit of same polypide a few sections to one side of plane of Figure 36, 

 showing origin of inferior funiculus. X 410. 



Fig. 37. From cross section of branch showing early stage in development of the 

 bud. X 410. 



Fig. 38. From a sagittal section of nearly adult polypide, showing the two funiculi 

 and their muscles. X 410. 



Figs. 39 and 40. Two neighboring sections parallel to the body wall through a bud 

 of the stage of Figure 23. Figure 40 lies three sections below Fig- 

 ure 39. Figure 39 shows the atrial cavity, formed as yet only on the 

 anal side. Figure 40 shows the beginning of formation of the ali- 

 mentary tract at the anal end. Note the vacuolated condition of the 

 mesoderm. X 410. 



Fig. 41. Polypide of about the stage of Figure 25 looked at en face. The anal 

 tentacles, being turned under, do not appear. To show compressed 

 condition of polypide, and alternating position of tentacles. Cf. 

 Figure 77, Plate IX. X 320. 



