1899] MICROSCOPICAL JOURNAL. 113 



our shore. The type illustrated by Wm. Smith is also 

 abundant in this state, but is found in pools orpondholes 

 in the salt marshes which are fed by freshwater springs. 

 I find them in company with the remarkable colonies of 

 Pleurosigma terryanum and Navicula maculata atLeete's 

 Island. But my most remarkable find of them was at 

 Branford, in a pool so nearly fresh that it was filled with 

 growing fresh water plants, from among which I scooped 

 up the Surirella. These were much heavier than the 

 salt-water type, and more circular in outline. I returned 

 afterward to get a larger supply and found the pool cov- 

 ered with an embankment, and a large building standing 

 nearly over the buried diatoms. The gathering of Ar- 

 temia gracilis was placed in a bowl and exposed with the 

 diatoms, but they did not do well. In a short time, all 

 were dead and I returned them to the bottle to preserve 

 the eggs. 



In October, 1896, more than a year after they were 

 gathered, many of the eggs hatched, and the water was 

 filled with young Artemia. They did not flourish but all 

 died before reaching maturity. In many of the cultures, 

 the slightly sigmoid Nitzschia appeared proof against 

 the animals, and they finally rivaled in numbers the or- 

 iginal Pleurosigma. I hoped that the Surirella being too 

 large to be swallowed by any microscopic animal, and 

 having developed in captivity, might live long enough to 

 show their entire life history; but I soon saw that this 

 was hopeless, as in every study under the microscope I 

 saw "eels" thrusting their heads through between the 

 side hoops, and absorbing the entire contents of the dia-^ 

 torn in a few minutes. 



I separated many of these Surirella and made separate 

 cultures with a peculiar result. The endochrome would 

 shrink and be surrounded by a hyaline envelope stretch- 

 ed out into points of attachment to the edges of the valve, 

 precisely similar in this respect to the sarcode of a rhizo- 



