GENUS EUGLTPHA— EUGLYPHA ALVEOLATA. 213 



irregularly placed. The shell was replete with the contents, including 

 the large nucleus occupying its ordinary position. The sarcode was 

 mingled throughout with brownish particles of food, and also cont?,ined a 

 single large navicula. 



Closely adherent to the mouth of the parent Euglypha was the off- 

 spring, a smaller individual, little more than half the size of the former. 

 Its fundus was somewhat contracted and acute, and was furnished with five 

 spines. The peculiar structure of the shell was apparent, but appeared less 

 extended or unfolded. The contents filled the shell, and consisted of finely 

 granular colorless protoplasm, without any mixture of colored food particles, 

 and without a nucleus. 



Such was the appearance of the conjoined Euglyphas, parent and off- 

 spring, at the beginning of the observation, at 6 J o'clock, in the morning of 

 May 26, 1877. 



Closely watching the pair, the young Euglypha was noticed very 

 gradually to enlarge, and some of the brownish material of the parent 

 sarcode gently flowed into and became slowly diffused in the previously 

 clear, colorless sarcode of the offspring. The fundus of the latter expanded 

 and became dome-like, as in the parent. The large clear nucleus of the 

 latter disappeared, but the manner in which this took place escaped my 

 notice. For some time afterward no further very perceptible change was 

 detected in either individual. 



An hour from the commencement of the observation, the young 

 Euglypha had acquired nearly the size, shape, and appearance of the parent, 

 as seen in fig. 16. Now commenced an active circulation, as indicated by 

 arrows in the figure, a cyclosis, of the contents of the two shells, resulting 

 in a thorough admixture. The sarcode flowed continuously from the parent 

 on one side into the offspring and back again on the other side. Both indi- 

 viduals were replete with one continuous mass of brown, granular sarcode, 

 without nucleus or contractile vesicles; the navicula alone retained its 

 position within the parent. During the circulation of the sarcode, two 

 spines with their basal plates became detached from the young Euglypha, 

 but from what cause was not apjiarent. 



The cumulation ceased, and after a short period of quiescence, at 7£ 

 o'clock, I observed the appearance of a contractile vesicle at the fundus of 

 both individuals The vesicle collapsed, and reappeared in two, three, or 



