326 Transactions of the Society. 



ridges arranged in a spiral manner ; spores, globose or subglobose, 

 epispore smooth or ornamented with warts or raised bands variously 

 arranged. 



Kost., Mon., p. 243 ; Cooke, Myx. Brit., p. 61 (in part). 



Eostafinski divides the Mycetozoa or Myxomycetes into two primary 

 groups depending on the colour of the spores. Amaurosjporese, spores 



bands, x 1200 ; 176, a young spore with the epispore yet smooth, after 

 immersion lor an hour in absolute alcohol ; a, epispore ; 6, protoplasm 

 contracted; c, nucleus, x 1200; 17c, spore germinating after being in 

 water for 22 hours ; a, epispore : b, endospore ; c, ciliated zoospore escap- 

 ing from the spore ; d, its contractile vesicle, x 1200 ; 17c?, portion of 

 an elater, x 1200 ; \le, tip of an elater after immersion for an hour in 

 dilute potassic hydrate, the prominent ridges have disappeared, and a 

 narrow cavity terminating in the swollen portion near the tip, and con- 

 taining a granular substance, is brought into view, x 1200 ; 17/, portion 

 of wall of sporangium seen from the inside, the circular or crescent-shaped 

 markings are thickened portions of the wall, x 500. 

 Fig. 18. — Trichia minima^ Mass., spore, X 1200; 18a, group of plants seen from 

 above, x 50. 



„ 19. — Alwisia homharda, B. and Br., plants, X 2; 19a and 196, plants X 50 ; 19c, 

 threads of capillitium attached by one end to the wall of the sporangium 

 near its base, x 400. 



„ 20. — 01 igonema minutula, M.&s,s.,-p\&nis, x 50; 20a, spore of same, X 1200; 206, 

 tip of elater of same, x 1200. 



Plate VII. 



Fig. 21. — Trichia fallax, Kost., section of stem and base of sporangium, showing 

 the hollow of the stem filled with masses of an organic substance, a, a, 

 which pass by degrees into normal spores, 6, 6 ; x 350. 



„ 22. — Oligonema Broomei, Mass., group of plants, x 35 ; 22a, tip of elater and two 

 spores, X 400. 



„ 23. — Prototrichiaflagellifer,'Ros,t.,'hvauch.ed elater, X 400 ; 23a, spores of same, x- 

 400. 



„ 24. — Prototrichia cuprea, Mass., branched elater and spores, x 400. 



„ 25. — Oligonema nitens, Eost. ; var. Bavarica, elaters, x 400. 



„ 26. — Prototrichia metallica^ Mass., plants, x 35 ; 26a, elater, X 400 ; 266, spores, 

 X 400. 



„ 27. — 2'richia falku; Jiost, a genuina ; entire plants, X 35. 



,, 28. — Trichia fragilis, 'Rout; y serotina ; plants, X 50. 



„ 29. — Oligonema nitens, Rost., cluster of plants nat. size; 29a, spores of same, X 

 1 200 ; 296, elaters of same, showing ring-like thickenings at a ; on one 

 of the elaters, a very diffuse single spiral is present. 



Plate VIII. 



Fig. 30. — Hemiarcyria Ellisii, Mass., plants nat. size ; 30a, botryoid or fasciculate 



form, X 50 ; 306, portion of capillitium, x 400 ; 30c, spore, X 1200. 

 ,, 31. — Hemiarcyria rubifonnis, Host., spore, X 1200. 

 „ 32. — Hemiarcyria sti2ntata, Mass., plants nat. size ; 32a, fasciculate form ; 326, 



simple form, with the elastic capillitium, a, expanded, x 50 ; 32c, spore, 



X 1200 ; 32c?, portion of capillitium, x 400. 

 „ 33. — Hemiarcyria leiocarpa, Cooke, entire plant, X 35 ; 33a, spore, x 1200. 

 „ 34. — Hemiarcyria serpula, Host., entire plant, x 5 ; 34a, tip of elater, X 1200 ; 



346, spores, X 1200. 

 „ 35. — Hemiarcyria paradoxa, Mass., plants, x 50 ; 35a, portion of capillitium, x 



400 ; 356, free tip of branch of capillitium, x 1200 ; 35c, spore, X 1200. 

 „ 36. — Hemiarcyria Karsteni, Host., portion of capillitium, x 400. 

 ,, 37. — Hemiarcyria chrysospora, Lister, spore, X 1200- 

 „ 38. — Trichia advenula, M.-dSS, elaiexs, X 400; 38a, spore, X 1200. 

 The structures said to be magnified 1200 diameters are enlarged, but the orna- 

 mentation is as seen under a power of 1200 diameters. 



