208 Dublin Microscopical Club. 



PROCEEDINGS OF LEARNED SOCIETIES. 



DUBLIN MICROSCOPICAL CLUB. 



April 27, 1881. 



Spinidose Globigerina. — Professor E. Perceval Wright showed 

 mounted examples of Globigerina remarkable for the great length of 

 their superficial spines, with others where these were much reduced, 

 and, finally, ordinary examples where they were absent. 



Zygospore of a minute Cosmarium for the first time observed conjuga- 

 ted, and named Cosmarium Wrightianum. — Mr. Archer exhibited the 

 zygospores of a rather common minute Cosmarium^ but only now de- 

 tected conjugated at Castletown Berehaven by Dr. E.Perceval Wright, 

 to whom Mr. Archer owed this the only slide secured. This form 

 is minute, smooth; semi cells oblongo-elliptic, ends somewhat retuse ; 

 but this feature is so slight as to be very readily overlooked. It 

 has of course resemblances to several of the more minute forms 

 Cosmarium bioculatum, C. tinctum, C. Schliephackianum, C.pusillum. 



But the zygospore of these, so far as is known, differs much from 

 that of the present, except C. tinctum ; but then the differences of 

 these two species as regards the mature form are sufficiently striking, 

 the latter being still more minute, and having evenly elliptic semi- 

 cells of a reddish colour. The zygospore in the present form is 

 tetrahedral, the angles bluntly rounded ; in C. tinctum it is some- 

 times so, but more often subelliptic ; whilst, as is seen, the mature 

 forms differ in size, outline, and colour. This might fitly stand as 



Cosmarium Wrightianum. 



Histology of Metatarsus of Foetal Puppy. — Mr. B. C. Windle 

 showed sections through the metatarsus of a ten-day foetal puppy, 

 presenting a perfectly normal number and arrangement, tbus dif- 



fering from the section of the manus of the same puppy, exhibited 



to the Club at the last October meeting, which presented an extra- 

 interosseus muscle. 



May 19, 1881. 



Chalara cocos, n. s., Pirn. — Mr. Greenwood Pirn exhibited speci- 

 mens of a form of Chalara, a genus of Torulacei. This form, which 

 is probably undescribed, being quite distinct from Chcdara fusidi- 

 oides, grew inside a cocoa-nut. and consisted of a delicate mycelium, 

 giving off numerous slender threads, becoming multiseptate and 

 breaking up into short joints, apparently nearly hyaline and very 

 minute. Owing to this form having occurred amongst Aspergillus 

 and other moulds, it w r as impossible to arrive at any particulars as 

 to its general appearance or habit. Awaiting further investigation, 

 Mr. Pirn would record the form in question as Chalara cocos. 



Pollen of Sarracenia rubra and S.flava and Hybrid Form. — Pro- 





