342 Dublin Microscopical Club. 



puncta in the Desmids is, which was Mr. Archer's apology for bring- 

 ing forward the snbject on the present occasion. 



Advantages of Double Staining with Logivood and Eosin. — Dr. R. 

 J. Harvey showed an ordinary typical specimen of epithelium as 

 illustrative of the advantage to be derived in some cases by double 

 staining with logwood and eosin. The staining by the logwood 

 was confined for the most part to the connective-tissue elements, 

 which were of a rich blue-purple, whilst the epithelium was stained 

 a most brilliant rose-red by the eosin. The epitheliomatous nests 

 made thus a most striking contrast with the surrounding sarcoma- 

 tous structure. 



May 20, 1880. 

 Trachelomonas India, T. volvomia, and a neiv very Jiisjnd form. 

 — Mr. Archer showed living examples of a few Elagellata be- 

 longing to Trachelomonas — T. bulla, T. volvocina, as well as a 

 very hispid and ornate form, probably a new species. This was a 

 large form, the spines fore and aft long and numerous ; neck rather 

 long, and margined by a few rather long spines ; the body egg- 

 shaped, and bordered by a number of shorter spines ; internal 

 colour vivid green ; eye-speck brilliant ; motion fidgety, but active. 

 This is probably the prettiest and most ornate of the pretty forms 

 appertaining here, and might stand as Trachelomonas acanthophora, 

 n. sp. 



Bamularia cryptostegice, n. sp.. Pirn. — Mr. Greenwood Pirn 

 showed Ramularia cryptostegice, Pim. This form, according to 

 Dr. Cooke, who examined the specimen, is a new species, and is 

 described under the above name in the current number of ' Gre- 

 villea.' The threads are more developed than in the other species 

 of the genus ; spores large, oblong, and very numerous, with one to 

 three very delicate septa. The plant grew on seeds of a Cryptostegia, 

 sown in a small pot in Mr. Pim's stove at Monkstown. Mr. Pim 

 also drew attention to the fact that he had been able, by the use of 

 alcohol and glycerine jelly, to mount Moulds more satisfactorily than 

 by using other methods previously tried. Doubtless it was in this 

 way that the exquisite preparations by Dr. Zimmermann, shown by 

 Dr. M'Nab at a previous meeting of the Club, were mounted. 



Structure of Anns of Uossia macrosoma. — Prof. H. W. Mackin- 

 tosh exhibited a transverse section of one of the arms of the Cepha- 

 lopod Rossia macrosoma, which showed a large central nerve 

 occupying the axis of what appeared like a canal, the rest of the 

 cavity of which was filled with a crystalline substance, probably 

 sodium chloride ; outside this was a well-marked la3^er of connective 

 tissue, sending out bands between the bundles of longitudinal 

 muscles which formed the bulk of the intermediate part of the arm. 

 These bands again united to form a second sheath, external to which 

 was another stratum of muscle, both longitudinal and circular, with 

 nerve-branches through it. This stratum graduated insensibly into 

 the many-layered integument. There were bands of circular 



