120 PROCEEDINGS OF SOCIETIES. 



be made out, is doubtless a new, and certainly a very distinct, form. 

 This, when first detected, was found growing on Closterium dicli/- 

 motocum, hut the specimens now presented were upon JEremosplKsra 

 viricUs. This Chytridium, when fully formed, is globose, but beset 

 all round by numerous minute, hyaline, acute, short, s]nne-like pro- 

 cesses, one of these, somewhat longer than the rest, occupying the 

 pole or summit, whilst a few smaller than this, but notably longer 

 as a rule than those irregularly placed over the surface, stand out 

 equatoriallv ; the young cells are without these little spinelets ; and 

 when these become first manifested the polar one is the most pro- 

 minent, and those equatorially disposed lend, along with it, some- 

 what of a halbert-shape to the growing Chytridium. A root, or 

 mycelium-like process, seems to penetrate into the infested plant. 

 Dr. Barker had not seen the evolution of zoospores. Tor this seem- 

 ingly very marked form in this curious little genus he would 

 propose the name Chytridium spinulosum. 



Mr, Archer desired to place on record the occurrence, for a second 

 time, of Ohjtridium BarJcerianum, ejus ; and again, from Gallery 

 Bog, and, as on the first occasion, growing upon Zygnema. It had 

 occurred exceedingly sparingly ; but there could be no doubt what- 

 ever but that it was one and the same thing as the form he had first 

 brought forward (see Minutes of 20 Sept., 1866), and a very marked 

 and distinct form in this genus, and seemingly rare. 



Mr. Archer likewise desired to record the occurrence of Cosmo- 

 cladliim saxonicum in the same gathering from Gallery Bog ; the 

 first Irish specimens were from nearCarrig Mountain. This appears 

 an exceedingly sparing plant when met with. 



Mr. Archer exhibited some fine examples of an organism taken 

 from Gallery Bog, which he thought he would be justified in identi- 

 fying as Sijnura uvella, Ehr. This occurred tolerably plentifully 

 along with several other pretty things, such as Pandorina mormn, 

 a few specimens of Gonium pectorale, various Desmidieae, &c. They 

 formed a very pretty sight, slowly revolving under the microscope. 

 Garter has claimed Synura as some state of development of Yolvox 

 glohator. Quite irrespective of its seeming complete difference in 

 structure, Mr. Archer thought that one very strong argument 

 ao-ainst that assumption was that the present specimens, at least, 

 were taken from a station (Gallery Bog) which had never yet pro- 

 duced Yolwx glolator, and he would venture to hazard a conjecture 

 that it never would be found there. Volvox occurs in the Rocky 

 Valley, some hundreds of feet lower down than Gallery ; but it cer- 

 tainly has never yet presented itself, after repeated searchings, so 

 high up as the top of the Long Hill. Neither has it ever shown 

 itself in Featherbed Bog. Parenthetically, then, he thought he 

 might put the query, possibly not without its interest — At what 

 elevation does Volvox cease ? It does not appear to be an alpine 

 form in \i» distrihution. But further, Synura appears to be quite 

 different in structure from Volvox, and quite different in colour too, 

 being of a yellowish dull colour, in place of a bright herbaceous 

 green. Unlike Volvox, the individual monad-like structures areuni- 



