JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE VIII, 



Illustrating Mr. Archer^s Resume of Recent Contributions 

 to our Knowledge of '' Freshwater Rhizopoda.'^ 



Fig. 1. — T'seudocMamys patella^ seen from the side, the delicate mem- 

 brane forming the oral portion of the test is seen prominent below [p). 

 (After Hertwig and Lesser, drawn under " Zeiss. F. Oc. III.") 



Fig. 2«. — Fseudochlamys patella, without processes of attachment or 

 pseudopodia, perfectly at rest, flatly expanded (after F. E. Schulze). 

 X 400. 2^. The same, the test folded together, distinct processes of attach- 

 ment and a single long finger-like pseudopodium (after F. E. Schulze). 

 X 500. 



Fig. 3«. — "Encysted" state of Pseudochlamys patella (seen laterally). 

 X 400. 36. Showing an infolded condition of the lower (oral) portion of 

 the test. X 400. (From Irish specimens.) 



Fig. 5. — Hyalosphenia lata, F. E. Schulze, viewed from the broad aspect, 

 with a somewhat divided finger-liice pseudopodium. 



Fig. 6. — Posterior view of Quadrula symmetrica. 



Fig. 8. — a. Development of the zoospores in Microgromia, socialis, a single 

 individual of the colony transversely dividing into two portions; a, the 

 persistent anterior portion ; b, the posterior portion, which subsequently 

 forms the zoospore ; 86, representing the posterior portion, b, during its 

 exit ; 8c, its modification into a zoospore ; %d, the zoospore (formed from 

 the portion b of fig. 8«) ; 8<?, the young individual after leaving the mother- 

 colony — at the anterior end the nucleus, n — at the posterior the contractile 

 vacuoles, c,c; 8/", the young individual come to rest, the end possessing the 

 contractile vacuole still forms tiie anterior portion and sends out a proto- 

 plasmic process corresponding to the pseudopodial stem. 



Fig. 9. — Microgromia mucicola, Archer, n. s., three individuals; two show 

 a mutually inosculated pseudopodium. 



Fig. 10. — a. Plagiophrys scutiformis, Hertw. et Less., n, nucleus, o, 

 pseudopodial opening ; the example is seen from its broader aspect ; a for- 

 mation of vacuoles is seen in the protoplasm, regarded as indicative of im- 

 pending (leath ; 106, the same seen from the aboral pole. 



Fig. 11. — Plagiophrys sacciformis, Hertw. et Less., the end possessing 

 the pseudopodial opening contracted in a necklike manner by the infolding 

 of the membranous test. 



