142 



K. MITSUKUIU : STUDIES ON 



Description : — Tentacles 20. Ambulaoral appendages (" ein- 

 fache Saugfiisschen ") scattered over the entire body, on the sides 

 often ranch more nnmerous than on the ventrnm or dorsum ; 

 only the appendages of the dorsum possess, besides terminal 

 plates, supporting rods Avhich are spinous and tapering toward the 

 ends (Selenka). Dorsal appendages of two kinds, pedicels and 

 l)apillcTe (Thkel). Calcareous deposits : tables small, 0.03 mm. 

 high and 0.05 mm. broad. The crown of the spire with 8 ( — 10) 

 teeth around the nearly circular aperture. The buttons smooth, 

 0.048 mm. long and half as broad, of the usual shape with six 



