84 MR. T. WHARTON JONES ON THE BLOOD-CORPUSCLE CONSIDERED IN 
Explanation of the Plate. 
PLATE I. 
Lamprey. 
Though it was not considered necessary to describe the blood-corpuscles of the 
Lamprey particularly, a few figures of them are given for the sake of comparison. 
First Phase. — Granule-cell. 
Fig. 1. Granule-cell somewhat distended by the action of water. 
Second Phase. — Nucleated Cell. 
Fig. 2. A blood-cell in a state of transition from the phase of granule-cell to that of 
nucleated cell. 
Fig. 3. Nucleated cell, uncoloured stage. 
Fig. 4 a. Nucleated cell, coloured stage. 
Fig. 4 h. The same cell after the action of acetic acid, whereby the nucleus has been 
distinctly brought out. 
Skate. 
First Phase . — Granule-cell. 
Fig. 1. A granule-cell in the coarsely granular stage, presenting a clear spot on one 
side indicating the place of the nucleus. 
Fig. 2 a. Granule-cell distended by the action of water. 
Fig. 2 b. The same cell after the action of acetic acid. The granules have been dis- 
solved and a cellseform nucleus brought into view. 
Fig. 3. Granule-cell in the act of changing its shape, with movements of its granules, 
as described, par. 30 et seq. 
Fig. 4 a. Granule-cell in the finely granular stage after the action of water. 
Second Phase. — Nucleated Cell. 
Fig. 4 b. A cell in transition from the phase of granule-cell to that of nucleated cell. 
Fig. 5 a. Nucleated cell, uncoloured stage, circular. 
Fig. 5 b. A similar cell collapsed. 
Fig. 6. Nucleated cell in transition from the circular and uncoloured nucleated cell to 
the oval red nucleated cell, or nucleated cell in the second or coloured stage. 
Fig. 7- The nucleated cell in the second or coloured stage. 
Frog. 
First Phase. — Granule-cell. 
Fig. 1 a. Granule-cell in coarsely granular stage, and in the act of changing its 
shape (par. 59.). 
