Animalcules in Waters. 93 
tend their Bodies, and fwim about: and this 
they did after fome of this Gutter-Dirt had 
been kept dry for twenty-one Months toge¬ 
ther. Whence he concludes, that the Pores 
of their Skin are clofed fo perfectly, as to 
prevent all Perforation; by which Means 
they are preferved till Rain falls, when they 
open their Bodies, fwim about, and take in 
Nourifhment. , 
Fig:. VI. VII. fliew two of thefe Animal - 
cules in different Portions. 
Fig. VIII. is the Form they appear in 
when dry and contracted. 
We may find in the Waters of our Ditches 
feveral Species both of Teflaceous and Cruf- 
taceous Animalcules: two of the latter Sort, 
which are moft remarkable, are (hewn (Plate 
IX. Fig. I. and II.) in a fwimming Pofture, 
with their Backs towards the Eye. Their 
Legs are fome what like Shrimps or Lob- 
Iters, but of a much more curious Structure. 
They are lefs than a very fmall Flea, but 
are all Breeders, and carry their Spawn either 
under their Tail, or in two feeming * Bags 
hanging from their Sides, as in Fig. IL 
Thefe Bags may fometimes be obferved 
broken, and the Spawn (confiding of Glo¬ 
bules very large in Proportion to the Crea- 
* Arcan. Nat. Tom. II, Epift. I2I»_ Pbiiofojbh. Tran/aM. 
Numb. 288. 
2 tore) 
