Davenpori'. — Cristatella. 



PLATE X. 



Fig. 82. Transverse section of stomach of adult polypide. x 390. Compare witli 



Fig. 93. 

 " 83. Transverse section of proximal part of coecuni of same individual as that 



of Fig. 82. X 390. Cf. Fig. 94. 

 '• 84. 'I'rans verse section of oesophagus of a polypide whose atrial opening is 



just formeil. x 390. 

 '' 85. Transverse section of the coecum of an adult polypide near its distal 



e.xtreniity.. x 390. 

 " 80. Vertical section across a radial partition at its junction witli colony-wall. 



X 600. 

 " 87. Horizontal section of rijdial partition at its junction with colony-wall. 



X 600. 

 " 88. Small colony of Cristatella, drawn from transparent ohjcct, showing pol- 



ypides in optical section at different focal planes. X circa 40. 

 " 89-92. Muscle fibres in successive .stages of development. From thick sec- 

 tions. X 390. 

 " 9.3. Transverse section of stomach of the same polypide as that from wliich 



Fig. 84 was taken ; representing, therefore, a considerably younger 



stage than Fig. 82. x .390. 

 " 94. Transverse section of cu^cutr. of the same polypide as tliat from which 



Figs. 84 and 93 were taken, cut in a region nearly corresponding to 



the positi(m of that shown in Fig. 83. X 390. 

 " 95, 96. Two horizontal sections of a part of the margin of a small colon}' 



in whicli radial partitions are being rapidly formed in correspondence 



with rapid budding. Fig. 95 lies near the sole; Fig. 9G, near the roof. 



The same figures refer to the same partition x 300. 



