194 CLASS V. 
figs. 1—4); this is killed by vinegar. A third species that lives in the 
grains of blighted ears of corn may be revived, after lying dry for months 
and years, by moistening, (NEEDHAM and BAUER). 
Comp. on these species G@zE Naturforscher 1. 1774, 8. I—53, IX. 1776, 
s. 177—182, XVIII. 1782, s. 36—65, BavER Philos. Trans. 1823, p. 1, 
Pl. 1, 2, (Ann. des Sc. nat. Tom. 11. 1824, pp. 154—167, Pl. 7, 8), Duais 
Ann. des Sc. nat. Tom. 1X. 1826, pp. 225—251, Pl. 47, 48. 
Also in the intestinal canal of insects minute worms have been observed 
and commonly considered to be Ascarides, which belong to this division!. 
In other species the mouth is provided internally with three 
unciform structures or jaws. They may be included in the genus 
Enoplus Dusarv. (Enoplus, Oncholaimus Dusarp., Amblyura 
Exrens.?) They live in fresh and salt water. 
Finally, certain small worms that live in water and in moist 
earth cannot well be placed otherwise than in the neighbourhood of 
the Nematoidea; they are included in the genus Gordius L. (the 
Filarie excepted). They are, however, distinguished from the 
Nematoids by their structure, and especially by the absence of 
a posterior aperture in the intestinal canal. Dusarprn and V. Ste- 
BOLD have shewn that these animals in the early period of their 
life live parasitically in insects. 
Family Gordiacea. Body filiform, extremely slender, elastic. 
Anus none; sexes distinct. 
Gordius L. (in part). Head rotund, mouth none, or not distinct. 
Tail of male bifid, of female rounded. 
Sp. Gordius aquaticus L., Encyclop. Vers. Pl. 29, fig. 1. Seven to ten inches 
long, scarcely half a line thick ; comp. CHARVET Nowy. Ann. du Mus, Ut. 
1834, pp. 37-460; BrertHoip Ueb. den Baw des Wasserkalbes, Gottingen, 
1842, 4to; V. SrmBoLtD Lntomol. Zeitung, 1843, 8s. 77, ERicHson’s Archiv. 
1843, Il. s, 302—308. 
Mermis DusArD. Mouth terminal. In female the vulva for- 
ward, transverse. 
Comp. Ann. des Sc. nat. 2e Série, Tom. XVIII. 1842, pp. 129, &e., Pl. 6. 
1 Here, too, may be placed Oxyuris gryllo-talpe, Lon DurouR Ann. des Se. nat. 
2e Série, Tom. vii. Zool. Pl. 1. fig. 2, and perhaps the genus Anguzllina of HAMMER- 
SCHMIDT not described in detail (Anguillina monilis in Aphodius conspurcatus), OKEN’S 
Isis, 1838, p. 318, which however more probably belongs to Mermis DUJARDIN. 
