PLATE LVI. 



Fios. 



1-6. Microgromia socialis Hertwig & Lesser, (p. 129) 

 Fig. 1. — Individual dividing transversely. Fig. 2. — 

 The upper moiety escaping from the test. Fig. 3. — 

 Its modification into a zoospore. Fig. 4. — 'i'he zoo- 

 spore. Fig. 5. — A young active individual after 

 leaving a colony. Fig. 6. — The same at rest. After 

 Hertwig & Lesser, x 400. (These were copied by 

 Archer in his illus. in Q.J.M.S., 1877, PI. VIII.) 



7, 8. M. mucicola Archer, (p. 132) After Archer, x 

 800. (Q.J.M.S., 1877, Pi. VIII, fig. 9.) 

 9. Lieberkuehnia wageneri Clap. & Lach. (p. 134) 

 Active individual with the pseudopodia not fully 

 extended, x 300. 



10. Rhyncogromia nigricans (Penard) Rhumbl. (p. 142) 



X 300. 



11. Diplophrys Archeri Barker, (p. 144) A colony of 



young individuals about to divide into two small 

 colonies, x 1000. 



