A NEW FIELD FOR THE MICKOSCOPIST. 
119 
the protean shapes assumed at will by their minute occupants 
during both their adult and developmental states. A variety of 
the more remarkable of these will be found represented in the 
accompanying illustrations. Thus one of the most cosmopolitan 
representatives of the tribe, Saljpingceca amjphoridium , while 
under ordinary conditions exhibiting that aspect characteristic 
of all other members of the group broadly described on a pre- 
ceding page, is at times, to all but the initiated, metamorphosed 
beyond recognition. In one of these phases (Plate IV. fig. 4) 
it will be seen that while the flagellum remains extended, a 
portion of the body-sarcode of the monad is protruded from the 
aperture of the lorica. A still more singular form frequently 
assumed by this same species is delineated at fig. 5 of the 
same Plate. Here both the collar and flagellum have entirely 
disappeared, and one-half or more of the body-substance is pro- 
jected from the orifice of the lorica in the form of numerous 
lobate processes resembling the pseudopodia of a Difflugia , 
to which Rhizopodal type the creature now bears a close re- 
semblance. By patiently watching an example presenting this 
Difflugian aspect, it was found that in a little while the protruded 
lobate portion became gradually separated from the posterior 
half, and floated away in the form of a minute stellate amoeba ; 
this subsequently attaching itself, developed a new lorica, and 
grew into a collar-bearing form, identical with that from which it 
originally sprang. The posterior half, left in the parent domicile, 
speedily acquiring a new collar and flagellum, is not to be dis- 
tinguished from the normal aspect it presented previous to 
entering upon the process of transverse fission. Another and 
characteristic phase frequently observed in association with this 
same species is that quiescent, or “encysted,” condition re- 
presented at Plate IV. fig. 7. During this period of its life- 
history all external signs of vitality are suspended, and the 
body of the monad shrinks into a spherical or ovoid shape within 
its flask-like habitation. A little later this encysted monad breaks 
up into numerous locomotive spore-shaped bodies, each furnished 
with a single flagelliform appendage. These, after dispersing 
themselves through the surrounding water, become attached, and 
growing to the likeness of the parent form lay severally the foun- 
dation of future colonies. An illustration of the liberation and 
dispersal of the locomotive spores or germs of an allied species, 
S. fusiformis , is given at Plate IV. fig. 26. 
While the mode of increase by fissi-gemmation in the loricate 
type Saljoingoeca almost invariably takes, as already described, 
a transverse direction, it appears in the compound pedicellate 
genus Codosiga to as constantly follow a longitudinal one, it 
being, indeed, this latter mode of fission, accompanied by the ad- 
herence to one another of the individual monads by their bases, 
* _ 4 
