GENUS NEBELA— NEBELA COLLARIS. 149 



The general appearance, extent, arrangement, and constituents of the 

 sarcocle are the same as in Hyalosphenia. The nucleus is usually obscured 

 from view by the accumulation of food and other matters. The contractile 

 vesicles are seen, two or three in number, between the position of the 

 nucleus and the periphery of the sarcode mass. Among the yellowish 

 contents of the endosarc, the balls often have the appearance of oleaginous 

 globules 



The pseudopods are digitate, mostly simple, and usually from two or 

 three to half a dozen in number. They extend to the ^th of an inch in 

 length or more, and commonly are about the j^th of an inch thick. 



The range of size and the proportionate diameters of Nebela collaris 

 vary considerably. Average-sized specimens are about ^th of an inch 

 long, gj- th broad, ^th thick, with the mouth about ^th broad and j^- th in 

 the short diameter. A common-sized specimen was the ^th of an inch 

 long, ^th broad, ^th thick, with the oral end ^th by ^th of an inch. 

 The smallest specimen, of a large number, was ^th of an inch long, 

 ^th of an inch broad,- ^th of an inch thick, with the mouth end ~\h by 

 gigth of an inch. The lai-gest specimen, from moss, on the borders of a 

 lake high up in the Uinta Mountains, Wyoming Territory, was ^th of an 

 inch long, ith of an inch broad, and g- 6 th of an inch thick, with the oral 

 end ith by ^ th of an inch. 



Nebela collaris may frequently be observed with the sarcode in the 

 condition of a quiescent ball, or in an encysted state, occupying the central 

 portion of the body of the shell, as represented in figs. 7, 8, 1 0, pi. XXII. 

 The ball is compressed spherical, and varies in size in different individuals. 

 At an early stage it contains a quantity of the yellowish food, but this is 

 gradually discharged, and contributes to the formation of the epiphragm 

 usually found occupying the mouth and neck of the shell. In its later 

 condition, the sarcode ball is pale yellowish or nearly colorless, of granular 

 constitution, mingled with coarser and more defined granules and oleagi- 

 nous-looking globules, small and large. 



The epiphragm (fig. 7) is laminated, and often contains globular 

 bodies, apparently remains of the food discharged or purged from the 

 sarcode ball. 



Occasionally specimens occur in which the sarcode is substituted by 

 a variable number of granular spheres, of nearly uniform size, which, 



