860 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Thelepus hamatus — figs. 16 to 18. 



Fig. 16. — ^SetafromX. X 585. 



Fig. 17. — Two forms of uncini from X; a, front views of two similar'ones showing 



different arrangements of the teeth. X 585. 

 Fig. 18. — Uncinus from XXX; a, front view of another. X 585. 



Amphitrile palmata — figs. 19 to 22. 



Fig. 19.— Seta from VII. X 335. 



Fig. 20. — T'ucinus from XX. X 480. 



Fig. 21. — Uncinus from L. X 480. 



Fig. 22. — One of the second pair of gills. X 8. 



