PROCEEDINGS OF SOCIETIES. 



Dublin Microscopical Club. 



15^^ March, 1877. 



Bavenelia stictita exhibited. — Mr. Pim showed Bavenelia stic 

 tica, an East Indian fungus, which he had received from Eev. J. 

 E. Vize, to whom it had been sent by Col. Hobson. The genus 

 Eavenelia belongs to the Uredinei ; it consists of several cells 

 united together resembling somewhat the genus TJrocystis ; they 

 are beset with remarkable prominences reminding one of the 

 zygospores of some Desmidiese. Mr. Pim was unable to ascer- 

 tain on what plant this fungus was parasitic ; it mostly affects 

 Leguminosge ; one or two species have been found in North 

 America. 



A new Coscinodiscus (collected hy Mr. Moseley, H.M.S. ' Chal- 

 lenger'), from the Sea of Jrefusa.—Hev. E. O'Meara presented a 

 number of Diatomaceous forms from a gathering made from the 

 surface of the Sea of Arefusa by Mr. Mosely, of H.M.S. 'Chal- 

 lenger.' Mr. O'Meara characterised this as one of the richest 

 collections that had ever come under his notice. Numerous 

 species of Ehizosolenia, Chaetoceros, Bacteriastrum, &c., occurred 

 in ample abundance. To one form Mr. O'Meara called special 

 attention —a large species of Coscinodiscus — which he considered 

 undescribed. At first view it might appear rather to belong to 

 the genus Craspedodiscus, but, on more minute examination, the 

 apparently distinct border disappeared. The following is a des- 

 cription of the species : Diameter -022", centre large, free from 

 areolation. Areoles radiate, at the margin large, hexagonal, thence 

 somewhat compressed, decreasing in size towards the centre, and 

 somewhat elongated. Towards the end of the radiate lines of 

 areoles are somewhat shorter than others, in consequence of 

 which the free centre has somewhat of a starlike appearance. 

 He proposed to name this form Coscinodiscus Craspedodiscus. 



Petalonema alatum, Berkeley , from Falls of Niagara, exhibited. 

 — Dr. Barker showed examples of the alga, Petalonema alatum, 

 taken by him at the Falls of Niagara ; these appeared in every 

 way similar to the British. 



Sagitta tricirrhata, Saville Kent, exhibited.— Br. Macalister 

 exhibited specimens of Sagitta tricirrhata, Saville Kent, sent him 



