Davenport. — Cristatella. 



PLATE VI. 



Fig. 53. Young funiculus, showing its connection with polypide. X GOO. 



54. Origin of muscles. The section* passes diagonally across a partition at 

 the left, di sep. r., and cuts the polypide tangentially at the right. 

 x 390. 



55. Section including a radial portion, showing the position of the muscles in 

 the partition near the margin of the colony, x 890. 



56. Section through the retractor and rotator muscles of a polypide of about 

 the age of that shown in Fig. 77. x 390. 



57. Young funiculus, whose upper end is free from the coclomic epithelium of 

 the roof of the colony, x 390. 



58. Section through the sole, showing the relation between the muscle cells 

 and the muscularis of the sole. X 600. 



59. Section across a radial partition, and both rotator and retractor muscles 

 which are migrating from the roof to the sole. X 390. 



60. Section at right angles to the wall of the colony, showing the elongated 

 and unmetamorphosed cells of the margin, x 390. 



