148 



EECEEATIVE SCIENCE. 



elastic ropes, haultlie body along. Tkus 

 the Amoeba, ever changeful in its form (as its 

 name implies), travels along, investing in its 

 jelly-flesh as it progresses atoms of food, 

 which thus entangled and enveloped by its 

 pulpy flesh are so digested. 



Besides the naked Amcebas there is the 

 similar group of Gromias, in which the sar- 

 code is inclosed and protected by a bag-like 

 cuticle, from the aperture of which alone are 

 the pseudopodia extruded (see woodcut, p. 

 145, fig. 3.) 



Another class of jeUy-flesh animals is pos- 

 sessed of shelly coverings — these are the Fora- 

 minifera, to which we have already alluded. 

 These sometimes consist of a single glo- 

 bule of sarcode coated with a calcareous skin 



19 20 21 22 



Hyaline-shelled Foraminifera (Bead-like arrange- 

 ment, running into Nautiloid). 

 Fig. 13, Lagena (Oolina, D'Orbigny) clavata. Genus, 

 NoDosARiNA. 14, Dentalina elegans, D'Orb. 15, 

 Nodosaria nigosa, D'Orb. 16, N. hispida, D'Orb. 

 17, N. spinicosta, D'Orb. 18, N. bacillum, D'Orb. 



19, Frondicularia annularis, D'Orb. {Chevron-style). 



20, Flabellina rugosa, D'Orb. {Spiral and chevron). 



21, Cristellaria laneeolata, D'Orb. 22, Cristellaria 

 Josepbina {Nautiloid), 



or shell; sometimes a second globule — for 

 the Foraminifera grow by gemmation, a com- 

 mon method of increase amongst the lower 

 grades and microscopic forms both of animal 

 and vegetable life — is formed upon and over- 

 laps the first. Often the adult Foraminifer 

 is constituted of a succession of such unsepa- 

 rated globules of lime-coated sarcode, deve- 



loped in linear order on a straight or on a 

 curved line, or in a spiral arrangement, or 

 alternated in twists and braids, or in disc-like 



23 24 25 26 27 



Hyaline-shelled Foraminifera (Braid-like arrange- 

 ment). 

 Genus, Polymorphina. I'ig. 23, Polymorphina lactea, 

 var. horrida (Globigerina tubulosa, D'Orb.) 24, 

 Polymorphina complanata, D'Orb. 25, Uvigerina 

 pygmea, D'Orb. 26, Textularia Mariije, l3'0rb, 

 27, Textularia deperdita, D'Orb. 



or shell-like types, the latter often putting 

 on a nautiloid appearance. In the early days 

 of Natural History science this has caused 

 such Nautdus-resembling Foraminifera to 

 have been figured and described, by even 

 some eminent naturalists of the old school, 

 amongst them by Linnaeus himself, as the 

 minute young, or as particular species of 

 that genus of cephalopods ; they overlooking 

 in those statements the fact that the walls of 

 the chambers of the Nautilus are incurved to 

 admit the inhabitation of the outermost cell 

 by the animal, whUe the separating perfo- 

 rated walls of the Foraminifera — for the shelly 

 coverings of most of these little living jeUy- 

 lumps are perforated like sieves, with orifices 

 for the protrusion of their pseudopodia— 

 always retain the globular shape of the jelly- 

 globules they cover and inclose. 



28 ■ 30 



Opaque-shelled Foraminifera (Circular and other 

 arrangements). 

 Fig. 28, Peneroplis (Spirolina, D'Orb.) Austriaca. 

 29, Pavonina (Cuneolina, D'Orb.) triangularis. 30, 

 Cyclolina cretacea, D'Orb. 



Wonderful indeed in these Foraminifera 

 are the beautiful, elegant, and varied forms 

 produced by the difierent arrangements of 



