PROCEEDINGS OF SOCIETIES. 295 



Dr. Macalister showed some Fossils from the Lias, believed to 

 he Fish, of which, however, he would make sections, and try to 

 work and exhibit at a future meeting. 



Mr. Archer drew attention to a species of ffidogonium unde- 

 scribed, though it is just possible it may be identical with 

 one alluded to, though uot described, in Pringsheim's splendid 

 paper ; and though cousidered here as undescribed, it is again 

 possible that it may be identical with some of Hassal's, though, 

 from the insufficient descriptions, it would be impossible to be 

 certain. The present plant may be thus characterised : 



QSdogonium Prinffsheimianuin (s]). nov.). * 



Plant monQ?cious ; oospore elliptic, its wall marked by some- 

 what coarse longitudinal striae, not filling the cavity of the much 

 larger and elliptic oogonium ; apertiire of the oogonium very 

 high up, being quite close to the annular striae of the " caps." 



Of Pringsheim's species none are described at once monoecious 

 and elliptic-spored, though in a note he says he knows one such. 

 Can this be the same ? Following Pringsheim, now that he has 

 shown us on what characters the true species in the (Edogoniese 

 seem to depend, it is doubtless better to ignore all old species in 

 this group based merely on relative dimensions of the cells and 

 such like characters, whose value is no more than subordinate. 



Mr. Archer further showed fine characteristic specimens of 

 (Edogonhcm acrosporiwi (De Bary), showing the three-celled, 

 very long, and slender dwarf male, the terminal striate oogonium, 

 without a special wall to the oospore ; in fact, every character of 

 this singular species in the most absolute manner, so that there 

 could not be any doubt of the identity of the present plant with 

 that described by De Bary. This species Mr. Archer had once 

 before encountered and exhibited, but it appears rare ; and the 

 present specimens were in so nice order, and they are always 

 fugitive, and hence it was well to seize the opportunity of bringing 

 them forward. 



Mr, Archer drew attention to a species of Chytridium attacking 

 the oospores of the plant referred to above under the name of 

 (Edogonium PrmgsJieimianum. These occurred mostly in pairs, 

 sometimes one only being present, and were seated upon the 

 oospores, and of an irregular clavate or pyriform figure, tapering 

 off into long necks, which protruded, side by side (or singly), 

 through the aperture in the oogonium, which, as just described 

 for the species, is very high up. From the base of the Chytridium 

 an elongate process or root is sent into the oospore, which is, of 

 course, killed. The zoospores escape by the opened apertures of 

 the neck. It becomes a query whether this may be identical or 

 not with the Chytridium decipiens (A. Braun), which also lives 

 upon the spore of an (Edogonium, but for it is described no neck. 



Mr. Archer finally drew attention to a new rhizopod, the type 

 of a new genus, which he thought should be thus characterised, 

 and would name it — 



Cystophrys (nov. gen.). 



