460 PROCEEDINGS OF THE ACADEMY OF [July, 



•the outline of a fish. The long, narrow spores (Plate XXXVI, figs. 

 1-3, 10-12), which were in the great majority, sometimes tapered 

 regularly from the broad to the narrow end. In others, how- 

 ever, the contours were not smooth, there being little irregularities 

 and swellings along the periphery of the body. The short, broad 

 individuals, as will be shown later, were probably degenerate. 



A vacuole near the centre could generally be seen. At times, also, 

 a second vacuole could be made out very close to the broad end. 



In a number there could be seen a dark, refractive body, rounded 

 or rod shaped. It was sometimes near the centre; in other cases 

 nearer the broad end. 



A few of the long forms were slightly curved, but as a rule the 

 longitudinal axis was sensibly a straight line. In a few the cytoplasm 

 ■contained granules. 



Measurements of several individuals, taken at random, gave: 



Long. Short. 



13.8 x 2.6 microns. 8.3 x 4.1 microns. 



13.8 x 3.1 8.3 x 4.1 



14.5x2.1 8.3x3.1 



14.5x2.6 9.4x2.6 



15.0 x 2.6 9.4 x 2.6 

 14.5 x 3.1 



Hence the length varies from S.3-15/j; the breadth from 2.6-4.1. 

 Excluding, however, the short forms, believed to be degenerate, it is 

 found that the spores are about 14-15/* long by 2-3 broad. 



Fixed Material. 



Cysts. — In cross section the cysts show a differentiation into what 

 Stiles has termed central core and peripheral layer or zone. This 

 differentiation, while quite evident when the cross section is viewed 

 with low powers, has no morphological significance. The peripheral 

 zone is that portion of the cyst in which the spores are still alive; the 

 central core that portion wherein they have died and degenerated. 

 This was pointed out by Stiles. 



In the case of one of the mounted specimens, the cross section was 

 oval, measuring 1.05 by .84 millimeters. The central core was roughly 

 .71 x .57, while the peripheral shell varied in thickness from .105 to 

 .194 mm. Presumably, in the living cyst, the central core will occupy 

 the geometrical centre of the cyst. 



Hence, in this particular case, there had been distortion, which 



