THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL, 



Vol. XI. JULY, 1890. No. 7. 



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Some Newly-Described Desmids. 



[with one plate.] 



In the June number oi \\\<i Journal of the Royal Alicroscopical So- 

 ciety is a paper by Prof. Win. West, of the Technical College, Brad- 

 ford, giving a list of fresh-water Alga? from North Wales. From it are 

 extracted the descriptions of new species and varieties of desmids, as 

 follows : 



Fig. I. — Goiiatozygon })ii}iutiini.,\\(.^\' . sp. (G. cellulis subcylindri- 

 cis, apicem versus angustatis, utroque polo constrictis, vicies longius 

 quam latum, cytodermate dense subgranulato.) 



About twenty times as long as bioad, slightly swollen towards the 

 middle and constricted under the apices, cytoderm deuselv but slightly 

 granulate. 



Fig. 3. — Desmidiiini coarctalitDi Nord, var. ca/ndricn/n., nov. var. 

 (Var. cellulis brevioribus et apicibus latioribus.) 



This chiefly diflers from the type in the cells being shorter and hav- 

 ing broader apices. This variety is somewhat doubtfully placed under 

 this species, which it seems to connect with Desmidium cylinJricutii 

 Grev., the shape of the cells in front view being nearer the latter, but 

 the breadth of the apices bringing it nearer the former. The side view 

 shows the apices to be only about half the thickness of the cells, cor- 

 responding in this respect with D. coarctatuni Nord, with which it 

 also agrees in having the constriction reduced to a mere retuseness in 

 the side view. 



Fig. 3. — Staurastrutn margaritacciim Meneg., var. coroniilatntn 

 nov. var. (Var. cum annulo granulorum parvorum ad apices truncates 

 semicellularimi.) 



This has the apices of the semicells truncate and bordered by a circle 

 of small granules. 



Fig. 4. — Staurastrum bacillarc Breb. (Long 17-18 ,a.) 



Copyright, 1890, by C. W. Smiley. 



