CURREY, ON THE PHYTOZOA OF ANTHERIDIA. 53 



bears the granules is much smaller than a certain hyaline 

 covering, which covering is closely attached to the hinder 

 part of such inner portion, but extends far away from the 

 anterior part, and, in addition to this, the progressive motion 

 in this species originates in an alternate enlargement of the 

 longitudinal and transverse diameters, and is so slow as to 

 amount at the utmost to no more than 1-40" per minute. 

 The form of the body resembles that of Amn^ba priiiceps 

 (Ehrenberg). The vesicle in the hinder part of the body, 

 which was first described by Ehrenberg as a mouth, and 

 afterwards as an ovarium, is also present. 



After four or five days the Amceha assumes a spherical 

 shape and becomes motionless, the vesicular body expanding 

 and contracting rapidly as before, in a manner similar to 

 what takes places in many VorticellfB. These spherical mo- 

 tionless Amcebcs are then for the most part united by a 

 mucilage into groups of from ten to twenty. The mucilage 

 appears to be produced by the decomposition of a cast-off 

 external skin. 



In about a fortnight after the commencement of the experi- 

 ment a green point appears in the interior of tlie spherical 

 colourless body of the Amceha; this point gradually increases 

 in size until it fills up the entire hollow of the Amaha, and 

 after becoming covered with a cuticle it escapes in the form of 

 an elliptical bright-green cell, 1-300" in diameter, resembling 

 a Protococcus. It exhibits a round transparent cavity, devoid 

 of chlorophyll, corresponding in size and position to the 

 vesicular body of the Amaha, and resembling at its colourless 

 apex the motile gonidia of Cladophora. A few days later 

 the elliptic or roundish cell lengtliens, a formation of trans- 

 verse septa commences, and the uni-cellular alga becomes an 

 articulated one. 



All these transformations of phytozoa into Spirilla, Vihri- 

 ones, Monads, Amccbce, unicellular and articulated Algce, may 

 be observed, not only in the detached phytozoa, but in those 

 which remain in tlie interior of the sections of the Antheridia. 

 In those Antheridia of which the phytozoa are not fully ripe, 

 the Ama^bce are seen to originate in the middle of the internal 

 mass of phytozoary cells ; some of them make their way 

 out through the softened mass of cellular tissue, but others 

 remain in the interior of the Antheridium until their develop- 

 ment into an articulated Alga. 



Contemporaneously with Amaiha, and often earlier, there 

 may be seen amidst the mass of Monads bodies very similar 

 in form and motion to the genus Bodo {socialis), and which 

 increase by transverse division ; they have the iront end 



