GENUS EUGLYPHA— EUGLYPHA CILIATA. 217 



The mouth of the shell of Euglypha ciliata is transversely oval, and 

 bordered with a variable number of teeth, commonly ranging from four to 

 twelve in number, though I have seen specimens in which I thought I 

 could detect fourteen, sixteen, and eighteen teeth. The teeth are not acute, 

 as in E. alveolata, but are obtuse, and are crenulate at the sides. They 

 are formed by the lowest row of plates of the shell, which are decidedly 

 thicker than elsewhere, and also appear to be carinated or ridged in the 

 median line, as represented in figs. 4 and 23. Sometimes these plates 

 appear to exhibit a number of ridges ending in the crenulations of the oral 

 teeth, as represented in fig. 3. 



The exact relation of the oral plates with those succeeding, and other 

 points of their character, I failed satisfactorily to determine, so that my draw- 

 ings, so far as they are concerned, are to be regarded as only approximately 

 correct. 



The sarcode of Euglypha ciliata, its pseudopods, and habits of the 

 animal so far as observed, are identical with those of E alveolata. I have 

 occasionally observed individuals of Euglypha ciliata with the sarcode 

 retracted within the shell, and with the interval between it and the mouth 

 of the latter occupied by a more or less thick epiphragm. The sarcode 

 appeared entirely purged of remains of food, the accumulation of which on 

 the outside apparently contributed to form the epiphragm, as represented in 

 fig. G. Individuals in this condition I have supposed to be ready to pass into 

 an encysted state. In one instance I observed an individual, represented in 

 fig. 3, in which the sarcode was retracted from the fundus and sides of the 

 shell, and adhered to the latter only by two thick processes near the mouth. 

 Outside the latter, clinging to the shell, was a discharged epiphragm of 

 clear colorless substance. In this case I supposed that the sarcode had 

 been contracted into a ball, but afterward had been stimulated to activity, 

 and through pressure had ejected the epiphragm. 



In my various observations on Euglypha ciliata and other species, it 

 would appear that under certain conditions, among which are undue dry- 

 ness or cold, the sarcode retreats to the fundus of the shell. It then 

 gradually purges itself of all remains of food, which, together with succes- 

 sive films of discharged protoplasm, accumulate, and form a lid or 

 epiphragm closing the mouth of the shell. If the sarcode contains little 

 or no food, the epiphragm is composed only of discharged layers of proto- 



