and its Reproductive Cells. 5 1 



EXPLANATION OF PLATE IIL 



N.B. — All the figures in this plate are diagrammatic, in so far as it is 

 impossible to give the relative sizes of the different parts of which they are 

 composed, intelligibly, without enlarging them to an extent which would 

 be incompatible with the size of the plates in the ' Annals ;' nor is it 

 necessary. 



In all the figures of Amoeba, the ground-shading stands for the sar- 

 code and its moleculse, while the other specks and dots represent the 

 granules and fat-globules respectively. 



Fig. 1. Amoeba princeps, about gV-h of an inch in length, with somewhat 

 less breadth ; greatly magnified : a, the granules and fat-globules ; 

 b, vesicula or contracting vesicle ; c, reproductive cells, upwards 

 of 32, and all ygVo th of an inch in diameter ; d, smaller granuli- 

 ferous cells ; e, large globular transparent cell, g^^o^th of an inch 

 in diameter, with small granuliferous nucleus ; /, villous tail ; 

 ' g, h, i, forms of the granules, the largest about yo^g^th of an inch 

 long ; g, aggregated octahedral form ; h, ditto, still more com- 

 pound (composed of oxalate of lime ?) ; i, elliptical or earlier 

 form of granule ; k, fat-globules ; I, m, n, assumed reproductive 

 cells, more magnified ; I, oval form ; m, spherical ditto, both 

 without distinct capsule and without granules ; n, ditto, under 

 the effect of iodine, showing minute granules, but no capsule. 



Fig. 2. Ditto, about Tf^oth of an inch long, representing the " granulation 

 of the nucleus " : a, the granules ; b, vesicula ; c, nucleus, ^^th 

 of an inch in diameter, capsular, with nucleolus granulated ; 

 d, villi of tail, dilated into a vesicular form, giving a crenulated 

 aspect to this part ; e, spherule, like a fat-globule, occasionally 

 discharged from the tail, and afterwards bursting, when the cap- 

 sule remains, and the contents appear under the form of a group 

 of swarming little molecules, which adhere for some time to the 

 end of the Amoeba ; f, nucleus, of an oval form, x^-jyth of an inch 

 long, more advanced in granulation and from a larger and older 

 specimen of A. princeps; granules spherical, and about -rwrth 

 of an inch in diameter. 



Fig. 3. Ditto, about ^iiyth of an inch long, showing — a, vesicula; b, nu- 

 cleus divided into two ; c, villous tail ; d, nucleus, much magni- 

 fied, about 1 ,,'o oth of an inch in diameter, showing its charac- 

 teristic appearance in A. princeps ; e, transparent area left 

 by the nucleolus ; /, daughter nuclei, the result of the first di- 

 vision. 



Fig. 3'. Ditto, very small specimen, about jy^th of an inch long : a, ve- 

 sicula and villous tail ; b, nucleus. 



Fig. 4. Ditto, nearly effete, 2^*^ of an inch in diameter, containing upwards 

 of 74 reproductive cells, each jg^oth of an inch in diameter, now 

 consisting of coarsely granular protoplasm within a firm capsule : 

 a, granules ; b, reproductive cells ; c c, expansions of the dia- 

 phane bm-sting through the thickened pellicula ; d, reproductive 

 cell, more magnified, under the influence of iodine, showing oval 

 contracted shape of granular protoplasm and spherical cell. 



Fig. 5. Ditto, showing — a, vesicula; b, reproductive cells, among which 

 c represents one as yet undivided, which, after division, would 

 make up the number 8 ; d, peculiar form of villous tail ; e, Fur- 

 cularia biting the Amoeba. This sketch, as it stands, was made 

 at Bombay, in 1855. 



4* 



