PLATE LVII. 



S'lGS. 



l-b.-Amphitremaflavum (Archer) Penard. (p. 148) Figs. 

 1-3. — Narrow, oral, and broad views. Pig. 4. — 

 Broad view of an individual containing zooclilorellEe 

 with a transverse constriction as if a process of 

 division were taking place; further stages have not 

 been observed. Fig. 5. — Active individual contain- 

 ing zoochlorellae ; a broad short form which might 

 possibly be derived from a process of division as 

 suggested by Fig. 4. All x 500. 



6-8. A. wrightianum Archer, (p. 149) Figs. 6-7.-— Broad 

 and narrow views, x 500. Fig. 8. — Broad and 

 narrow views of a test from the peat deposit on 

 Clare Island, Mayo ; the covering of silicious parti- 

 cles, etc., having probably fallen off owing to decay. 

 X 250. 

 9, 10. A. stenostoma Niisslin. (p. 151) Broad and narrow 

 views of an active individual. x 500. 



