574: CLASS ix. 



ORDER 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. Two 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 confervse, 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. EICHHORN Wasserthiere, Dantzig, 1775 ; neue Auflage, unt. d. 

 Titel: Beitrdge zur Naturgesch. der Tdeinsten Wasserthiere, Berlin, 1781, 

 s. 74, Tab. vii. fig. E (der Wasserbar) ; SPALLANZANI, Opuscules de Physique 

 anim. et veget. n. Geneve 1777, II. pp. 349352, PI. IV. figs. 7, 8 (k tardi- 

 grade) J. A. E. GOEZE 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. MUELLER in FUESSLT, Archives d'Entomol. Tab. 36, p. 82, 

 Acarus ursellus. 



FR. VON PAULA SCHRANK, Fauna Boica, in. Bd., 1803, s. 178, Arctis- 

 con, s. 195, Arctiscon tardigraduin. 



C. A. S. SCHULTZE, Macrobiotus Hufelandii, cum tab. lith. Berolini, 

 1834, 4to. ejusd. Echiniscus Bellarmanni, cum tab. lith. Berolini, 1840, 4to. 



DOYERE Memoir e sur les Tardigrades, Ann. des Sc. not., 2e Se'rie, Tom. 

 xiv. Zoologie, 1840, pp. 269 361, PI. 12 18, xvn. pp. 193 205, xvni. 

 PP- 135- 



Echiniscus SCHULTZE, Emidium DOYERE. 

 Milnesium DOYERE. 



Note. DOYERE devised the generic name in honour of MILNE EDWARDS. 

 Here belongs the animalcule described by SPALLANZANI under the name of 

 Tardigradus, and perhaps Arctiscon SCHRANKII. 



Macrobiotus SCHULTZE. 



Sp. Acarus ursellus O. F. MUELLER, &c. 



(The affinity with the A cari 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 EHRENBERO.) 



