PROTOPLASTA FILOSA. 189 



CochUopodium vestitum is comparatively rare. Mr. Archer found it in 

 pools, both in the green and colorless state, in two localities in Ireland; 

 but Hertwig and Lesser, and Schulze, who describe the more common form, 

 C. pellucidum, do not appear to have met with this one. I have found it 

 only in two localities, and these very remote from each other: — in light 

 ooze, in Absecom pond, New Jersey, September, 1874; and in the same 

 kind of material, in China Lake, Uinta Mountains, Wyoming Territory, 

 August, 1877. 



Several specimens obtained at the former locality were of a bright- 

 green color from the large quantity of chlorophyl diffused throughout the 

 sarcode, as represented in fig. 26, pi. XXXII. Others, associated with the 

 bright green ones, were much less colored from the less proportion of 

 chlorophyl; and some had no color whatever, as represented in fig. 27. 

 The investing shell or membrane was more or less thickly covered with 

 short, delicate, rigid cils; but in all other respects, excepting the green 

 color of the sarcode when pi-esent, these specimens were like those of C. 

 bilimbosum. 



The specimens from the Uinta Mountains, as seen in fig. 28, had the 

 same character as the colorless ones of Absecom pond, but the shell had a 

 yellowish tinge. 



PROTOPLASTA FILOSA. 



The Filose Protoplasts, or the Protoplasts with extremely delicate 

 thread-like pseudopods, have the same general constitution and form as the 

 shell-covered Lobose Protoplasts. 



The sarcode or protoplasmic mass never exhibits so clear a differen- 

 tiation of ectosarc and endosarc as that of the Lobose Protoplasts, but 

 appears generally of more homogeneous character and exclusively like 

 the endosarc of the latter. The pseudopods never occur as coarse lobate 

 or digit-like extensions of the sarcode, but invariably as exceedingly deli- 

 cate threads, acutely forking, and becoming finer and finer as they branch. 

 They rarely or do not at all anastomose, and only at times become more 

 or less confluent through the entanglement of portions of food. In compo- 

 sition, the pseudopods appear as filaments of the finely granular protoplas- 

 mic basis of the sarcode, and are commonly devoid of conspicuous granules 

 or fine oil-like molecules. 



Like in most shell-covered Lobose Protoplasts, the sarcode contains a 



