396 WILSON. 
EXPLANATION OF PLATE XxX. 
(Tedania Bruce.) 
Fic. 67. Spicules: a, slightly bent strongyloxea; 4, oxea; c, tylote. (a, ;2% 
mm.) 
Fic. 68. Surface view, showing orifices intermediate in size between pores and 
oscula. X 8. 
Fic. 69. Section showing bodies g, probably young gemmules, imbedded in 
mesoderm. X goo. 
Fic. 70. Section: adult tissue with part of mature gemmule and a young gem- 
mule. D.4. 
Fic. 71. Section: mature gemmule with surrounding tissue. A.4. 
Fic. 72. Section through gemmule beginning to “segment.” C.4. 
Fic. 73. Part of section through gemmule, completely broken up into masses. 
Fic. 74. Part of section through gemmule near the close of ‘“segmenta- 
tion.’ G-4. 
Fic. 76. Section through embryo — columnar ectoderm entirely covers em- 
bryo. A.4. 
Fic. 77. Longitudinal section through unpigmented pole of embryo — cells at 
this pole still columnar. D.4. 
