68 



BULLETIN : MUSEUM OF COxMrARATIVE ZOOLOGY. 



EXPLANATION OF PLATES. 



All the figures, with the exception of those of Plate 2, were outlined with the 

 aid of an Abbe camera lucida. 



The high magnifications were obtained mostly by the use of a Zeiss 15 mm. 

 apochromatic homogeneous immersion objective with No. 4 compensating ocular. 



LIST OF ABBREVIATIONS. 



Spores of a fungus. 



Inner layer of " nipple " and 

 "bell" of Trichonympha. 



Middle layer of same. 



Outer layer of same. 



Cortical layer of granular 

 protoplasm. 



The granular protoplasmic 

 layer separating tlie " bell " 

 from the posterior part 

 (body) of Trichonympha. 

 St. gran.' Granular protoplasm marking 

 the region of transition from 

 the superficial (ectosarc) to 

 central (entosarc) portion 

 of the protoplasm in the 

 posterior half ("body") of 

 Trichonympha. 



Striated layer of the " bell " 

 of Trichonympha. 



Knob-like enlargement of the 

 anterior end of the proto- 

 plasmic axis of the "nip- 

 ple," Trichonympha. Also 

 knob-like structure at the 

 anterior extremity of Pyrso- 

 nympha. 



