for the Microscope. 43 



longitudinal and transverse. Found in salt marshes. (PI. 

 IV., fig. 21.) 



307. WINGED AMPHIPRORA (Amphiprora alatct). This 

 genus is distinguished by its side wings, which are con- 

 stricted in the middle ; so that when viewed in front the 

 form is more or less fiddle-shaped, with broadly rounded 

 ends, and the present species is often twisted. It occurs 

 on the surface of the mud in salt-water ditches. (PI. IV., 

 fig. 19.) 



308. SMITH'S MASTOGLOIA (Mastogloia Smithit). This 

 last genus has the frustules imbedded in a gelatinous 

 frond, and the frustules are oblong or boat-shaped. In 

 this species they are somewhat spear-shaped, with obtuse 

 extremities. Brackish water. (PI. IV., fig. 28.) 



FUNGI afford numerous interesting objects for the 

 microscope. Many of them are exceedingly common, 

 and most are easy of manipulation. Our present limits 

 will only enable us to enumerate a few of those which 

 recommend themselves either by their beauty or the 

 facility with which they may be obtained. 



309. WHEAT MILDEW (Puccinia graminis). Common 

 on grasses and straw in the autumn, forming long blackish 

 lines. The spores are two-celled, borne on a slender 

 colourless stalk, and accumulated in tufts, bursting through 

 the cuticle. (PI. V., fig. i.) 



310. CROWNED MILDEW (Puccinia coronata). A very 

 distinct species from the last, and occurs on the leaves of 

 the more delicate grasses. The apex of the spore bears 

 three or four tooth-like processes. (PI. IV., fig. 2.) 



311. MINT BRAND (Puccinia Menthce). The leaves of 

 mint in gardens are often attacked by a species of brand 

 or mildew, with shorter and broader spores than either of 

 the above, though otherwise similar. 



312. CELERY BRAND (Puccinia Apii). A similar brand 5 

 with two-celled spores., is found on the wild and also en 



