APPENDIX. .•^81 



of plasm, quantities of tree-shaped, branching and mobile 

 threads (pseudo-feet, or pseudo-podia), which do not become 

 retiformly connected. When, however, the Moneron eats 

 (Fig. 12), the mucous threads become variously connected, 

 form net-works and enclose the extraneous corpuscule which 

 serves as food, which the threads afterwards draw into the 

 interior of the Protomyxa. Thus in Fig. 12 (above on the 

 right), a silicious and ciliated Whip-swimmer (Peridinium, vol. ii, 

 pp. 51, 57), has just been caught by the extended mucous 

 filaments, and has been drawn into the interior of the mucous 

 globule, in which there already are several half digested silicious 

 infusoria (Tintinoida), and Diatomeas (Isthmia). Now, when 

 the Protomyxa has eaten and grown sufficiently, it draws in all 

 its mucous filaments (Fig. 15), and contracts into the form of a 

 globule (Fig. 16 and Fig. 1). In this state of repose the globule 

 secretes a simple gelatinous covering (Fig. 2), and after a 

 time subdivides into a lars-e number of small mucous globules 

 (Fig. 3). These soon commence to move, become pear-shaped 

 (Fig. 4), break through the common covering (Fig. 5), and then 

 swim about freely in the ocean by means of a delicate whip- 

 shaped process, like the Flagellata (vol. ii. p. 57, Fig. 11). Whea 

 they meet a Spirula shell, or any other suitable object, they 

 adhere to it, draw in their whip, and creep slowly about on it by 

 means of form-changing processes (Figs. 6, 7, 8), like Protamoebse 

 (vol. i. p. 186, vol. ii. p. 52). These small mucous corpuscules 

 take food (Figs. 9, 10), and attain their full grown form (Figs. 

 11, 12), either by simple growth or by several of them fusing to 

 form a larger protoplasmic mass (Plasmodium, Figs. 13, 14). 



Plates II. and III. (Between pages 294 and 295, Vol. I.) 



Germs or Embryos of four different Verteirate Animals, namely, 

 Tortoise (A and E), Hen (B and F), Dog (G and G), and Man 

 (D andB"). Figs. A, D, an early stage of development; Figs. 

 E, E, a later stage. All the eight embryos are represented as 

 seen from the right side, the curved back turned to the left. 



