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XXXIX. — On a Neic Species of the Genus Eucamjna. 

 By Henry Stolterfoth, M.D. 



(Read 8th October, 1879.) 

 The genus Eucamina was defined by Ehrenberg, and placed by 

 him amongst the Desmidiaceae. In Smith's ' British Diatomaceae,' 

 vol. ii. p. 25, it is rightly placed amongst the Diatomaceae. Only 

 two species are recognized by Smith, E. Zocliacus and E. Britannica, 

 and neither of these had been seen by him in the living state. 

 Both these species I have taken living by means of the tow-net in 

 the estuary of the Dee, Chester. There is QXiot]xev Eucampia known, 

 in the Hong Kong gatherings made by Dr. Palmer, as nodosa ; 

 this latter is, I believe, identical with E. Zocliacus, and only repre- 

 sents a stronger growth in a hotter climate. 



In the year 1875 my attention was called by A. 0. Walker, 

 Esq., Chester, to some circular rings taken in the tow-net. 

 These were, however, very few, and I then took them to be some 

 kind of unknown Confervae. The rings I have since continually 

 seen, but never in sufficient abundance to make out their silicious 



a. — Eucampia striata n. sp. X 350. 



6. — A single frustule, showing spines. 



c. — Eucampia striata, n. sp. var. maxima. 



d.— The common appearance of the frustule when seen on a burnt slide. 



On July 14th, 1879, I obtained a nearly pure gathering of 

 this form and was able to make a careful examination of it both 

 living, burnt on the cover glass, and preserved in fluid. 



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