JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XII, 
Illustrating Edouard Van Beneden’s Researches on the 
Development of Gregarine. 
Figs. 1—27 x 950. Figs. 28 and 29 x 250. Fig. 30 x 450. 
1, 2, and 3.—Naked cytods liberated from the psorosperms (Moner-stage). 
4.—An external layer devoid of granules surrounds the cytod, and gives a 
certain degree of fixity to its form. 
5.—Generating cytod, with two prolongations in course of development. 
6 to 6'—Generating cytod, showing different positions assumed by the 
mobile arm, and the distinguishing characters of the rigid arm. This 
same cytod has been observed during two hours. Figs. 6” and 6” 
show the transverse striations of the basilar portions of the arm. 
7 and §.—Cytod with two prolongations. The mobile arm is on the point 
of detaching itself. 
9 to 12.—Different phases of the evolution of the second arm. The body 
of the cytod is absorbed little by little by its elaboration. 
13 and 14.—Free pseudofilaria. They exhibit great activity. 
15 to 18.—Pseudofilaria become rigid. They shorten gradually, taking on 
more and more the characters of young Gregarine. A nucleolus is 
differentiated. Figs. 17 and 18 show the first traces of nuclear 
layer. 
19 to 27.—Successive stages of the development of the young Gregarina. 
28 and 29.—Gregarine more advanced in development. 
30.—Portion of the body of an adult Gregarina preserved in glycerin to 
show the muscular subcuticular fibrille. The portion of the body 
here represented is situated immediately behind the nucleus. 
