Fig. 11. — The tip of a full-grown tentacle that was 7 mm. long. 



Fig. 12. — Entire tentacle of a small specimen. This tentacle was 1.5 

 mm. long. 



Fig. 13. — Entire tentacle from the same individual from which fig. 12 

 was taken. In the figures of tentacles all the details were drawn with as 

 much accuracy as possible. Fig. 1?. was drawn to scale from micrometer 

 measurements. 



Fig. 14. — A fragment of the branchial membrane seen on its inner sur- 

 face. Drawn especially to show the relation of the dorsal languets to the 

 transverse blood sinuses. This is from a small individual 1.5 mm. long. 



110] 



