76 S. HIROTA, ANATOMICAL NOTES ON LINCKIA. 



Fig. 5. Vertical view of the oral portion of the ' comet ' represented in 

 Fig. 1. In this an upper part of the stomach is cat off and the 

 attachment of the stomach retractor muscles is partly concealed 

 under the remnant of the stomach. 



Fig. 6. Vertical view of the vertebral ridges and the water vascular system 

 in the disc of the ' comet ' represented in Fig. 1. The ampullae are 

 partly taken off. The adambulacral ossicles under the circuin-oral 

 tube are represented with slant lines. T — Tiedemann's body. 



Fig. 7. Represents a proximal portion of the vertebral ridge of a normal 

 arm. A represents the positions of the Polian vesicles. T — Tiede- 

 mann's body. The adambulacral ossicles under the circuni-oral 

 tube are represented with slant lines. 



Fig. 8. Represent a proximal portion of a coecuni in the principal arm of 

 the ' comet ' represented in Fig. 1 . H — Hepatic sacs. T — Tendinous 

 strings. P — Parallel lines. The lower end of this figure represents 

 the proximal end of the coecum. 



Fig. 9. Taken from a small arm of the last. The directions and the.symbols 

 are the same^as the last. 



Fig. 10 and Fig. 11. represents respectively the vertebral ridge and the am- 

 pullae at the constriction represented in Fig. '2, A. 



Fig. 12. Represents the distal end of a stone canal, at the inner side of the 

 primitive madreporic plate (Fig. 1,P.). S— Stone canal. P — Peri- 

 cardial sac. 



Fig. 13. Enlarged view of one half of the upper stomachic diverticula and 

 the'^tendinous muscles., represented in Fig. 4. 



Sur la Barentsia misakiensis. 

 Par Asajlro Oka. 



(Avec Ui pUaiche XII. J 



Description. Cette espece a ete deja decrite par moi sous le nom 

 d'Ascopodaria misakiensis dans le numero 20 de ce journal (1890), mais 



