SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 



9 8 



Fig. 2. — Thyone lugubris, n. sp. 



1-2, primitive plates from integument of small embryo; 3, end plate from a 

 small embryo, with few tube feet; 4-5, 7-8, supporting tables from tube feet; 

 6, beginning stage of knobbed reticulated plate from external layer of integument ; 

 9, beginning stage of a knobbed button ; 10, knobbed reticulated plate from ex- 

 ternal layer of integument. 



All from a small embryo, 1.5 mm. long. 



Scale, — mm. 

 100 



