Plate II. 

 Fig. 1. — D. Buedemann% Gurley. x 6. 



Shows middle plate of basal cyst. 

 Fig. 2. — D. Buedemanni, Gurley. x 6. 

 Fig. 3. — D. Buedemanni^ Gurley. x T. 

 Fig. 4. — Z>. Buedemanni, Gurley. x 10 . 



b. — Blastostyle. 

 Fig. 5. — Eestoration of I), pristis, Hall. Natural size. 

 Fig. 6. — D. pristis, Hall. Young rhabdosome. x 



h. — Hydrocaulus. 



V. — Yirgula. 



