338 PROCEEDINGS OF SOCIETIES. 



illustration of effects of injury to Spines of Echini. — Mr. Mac- 

 kintosh communicated some observations on the result of injury 

 and repair to the spines of Echini. He found that the general 

 result was the development of the reticulated structure at the 

 expense of the solid pieces, and this might go so far as to convert 

 all the secondary part of the spine into network, leaving no trace 

 of the solid pillars', but usually these latter persisted, though very 

 much reduced in size. A section of the altered spine of Strongylo- 

 centrotus lividus was exhibited, in which the central part was 

 occupied by a hollow surrounded by the usual central network, 

 which is about double the normal amount, and sends out thick 

 somewhat triangular " spokes" between the considerably reduced 

 pieces. 



Sporoehisma mirahile (on dead JSollyleaves) exhibited. — Mr. 

 Greenwood Pirn exhibited Sporoehisma mirabile, B. and Br. A 

 remarkable torulaceous fungus, described as parasitic on beech- 

 branches. It occurred in this case on dead holly twigs at 

 Hollybrook near Bray. It consists of simple flocci with a tough 

 inarticulate exterior membrane which breaks up into quadri- 

 articulate spores. There is a rather strong superficial resemblance 

 (though, of course, nothing more) to some Scytonematous Algge. 



Multinucleated Cells from epithelium of Frog's stomach. — Dr. 

 Purser showed a mounting of epithelial cells from a frog's 

 stomach, presenting the remarkable peculiarity of possessing from 

 one to several (sometimes as many as six) nuclei, a condition 

 which had never before come under his observation ; the animal 

 was a healthy female. 



Lejeunia calyptrifolia exhibited. — Dr. Moore exhibited under 

 a low power some pretty examples of the rare and minute 

 Lejeunia calyptrifolia. This ordinarily grows on other Junger- 

 manniese, but the present examples were formed on the bare 

 rock. 



Closterium obtusum, Breb., new to Ireland, exhibited. — Mr. Archer 

 showed for the first time what was undoubtedly Closterium ob- 

 tusum, Breb., thus helpiug to complete the series of forms possibly 

 capable of being regarded as a distinct genus between Clo- 

 sterium, Penium and Cylindrocystus, of which he had exhibited 

 two new forms at the November meeting. He also presented an 

 example oi Spirotcenia obscura which seemed to show that the view 

 Le had suggested as regards the internal structure was correct, 

 and that that form was not truly congeneric with Spirotcenia con- 

 densata, Sp. muscicola, Sp. parvula, etc., but was more related to 

 the series of forms in question. 



Cosmarium SchliephacJcianum, Nordst., neio to Ireland, exhibited 

 with its Zygospores. — Mr. Archer had on the table conjugated ex- 

 amples of Cosmarium Schliephackianum (Q-run.), Nordst, just taken 

 in the " Rocky Valley " near Bray ; this gathering he had had under 

 observation, and had come to the conclusion that it was well- 

 marked and new, when next morning's post brought (for which 

 best thanks to the author) Herr Nordstedt's recent paper on 



