574 CLASS IX. 
Orper II. Colopoda. 
Feet very short, truncated, conical, indistinctly triarticulate, 
armed with four little claws or three, posterior placed at the 
extremity of body. Abdomen not distinct from trunk. T'wo ocu- 
liform points in most. Mouth with two styles exsertile, calcareous. 
(Androgynous animals). 
Family II. <Arctisca. (Characters of the order.) 
Here belong some small (microscopic) animals which live in 
mosses, in canals and sluices amongst conferve, and in rain-water in 
spouts. We alluded to them above (p. 206) in passing, and cited 
them when treating of the wheel-animalcule, with which they agree 
in the property of reviving after long apparent death. 
Compare J. E. ErcHHorn Wasserthiere, Dantzig, 1775 ; neue Auflage, unt. d. 
Titel: Beitrdge zur Naturgesch. der kleinsten Wasserthiere, Berlin, 1781, 
8.74, Tab. vil. fig. E (der Wasserbdr) ; SPALLANZANI, Opuscules de Physique 
anim, et végét. 1. Geneve 1777, IL. pp. 349—352, Pl. rv. figs. 7, 8 (le tardt- 
grade) ; J. A. KE. Goxze in his translation of Bonnet Abhandl. der Insek- 
tol. Anhang. p. 367, Tab. 4, fig. 7 (according to his citation in the Journal : 
Naturforscher, XX. s. 114.) 
O. F. MveEuER in Furssty, Archives d’Entomol. Tab. 36, p. 82, 
Acarus ursellus. 
Fr. Von Pauna ScHRANE, Fauna Boica, ut. Bd., 1803, s. 178, Arctis- 
con, 8s. 195, Arctiscon tardigradum. 
C. A. 8. Scuurtzn, Macrobiotus Hufelandii, cum tab. lith. Berolini, 
1834, 4to. ejusd. Hehiniscus Bellarmanni, cum tab. lith. Berolini, 1840, 4to. 
DoyviRE Mémoire sur les Tardigrades, Ann. des Sc. nat., 2e Série, Tom. 
xIv. Zoologie, 1840, pp. 269—361, Pl. 12—18, xvi. pp. 193—205, XVIII. 
pp- I—35- 
Echiniscus SCHULTZE, Emidium DovEre. 
Milnestum DOYERE. 
Note.—DoyzrE devised the generic name in honour of Minnz Epwarps. 
Here belongs the animalcule described by SPALLANZANI under the name of 
Tardigradus, and perhaps Arctiscon SCHRANKII. 
Macrobiotus SCHULTZE. 
Sp. Acarus ursellus O. F. Muruuer, &c. 
(The affinity with the Acari was already rightly perceived by the sagacity 
of the famous MUELLER, the most distinguished by far of all the investiga- 
tors of microscopic animalcules previous to HHRENBERG.) 
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