194 CLASS V. 



figs. I 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 GCEZE Naturforscher i. 1774, s. i 53, ix. 1776, 

 s> ^7 182, xvin. 1782, s. 36 65, BAUER Philos. Trains. 1823, p. i, 

 PI. i, 2, (Ann. des Sc. nat. Tom. n. 1824, pp. 154167, PI. 7, 8), DUGES 

 Ann. des Sc. nat. Tom. ix. 1826, pp. 225 251, PL 47, 48. 



Also in the intestinal canal of insects minute worms have been observed 

 and commonly considered to be Ascandes, which belong to this division 1 . 



In other species the mouth is provided internally with three 

 unciform structures or jaws. They may be included in the genus 

 Enoplus DUJARD. (Enoplus, Oncholaimus DUJARD., Ambtyura 

 EHRENB.?) 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 Nemato'idea; they are included in the genus Gordius L. (the 

 Filarice excepted). They are, however, distinguished from the 

 Nematoids by their structure, and especially by the absence of 

 a posterior aperture in the intestinal canal. DUJARDIN and V. SIE- 

 BOLD have shewn that these animals in the early period of then- 

 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 aquatics L., Encydop. Vers. PI. 29, fig. i. Seven to ten inches 

 long, scarcely half a line thick ; comp. CHARVET Nouv. Ann. du Mus. in. 

 1834, pp. 37 46 ; BERTHOLD Ueb. den Bau des WasserTcalbes, Gottingen, 



1842, 4to; V. SIEBOLD Entomol, Zeitung, 1843, s. 77, ERICHSON'S Archiv. 



1843, ii. s. 302308. 



Mermis DUJARD. Mouth terminal. In female the vulva for- 

 ward, transverse. 



Comp. Ann. des Sc. nat. 2e Se"rie, Tom. xvin. 1842, pp. 129, c., PI. 6. 



1 Here, too, may be placed Oxyuris gryllo-talpce, LEON DUFOUR Ann. des Sc. nat. 

 2e S^rie, Tom. vm. Zool. PI. i. fig. 2, and perhaps the genus AnguilUna of HAMMER- 

 SCHMIDT not described in detail (AnguilUna monilis in Apkodius conspurcatus), OKEN'S 

 7s/.s, 1838, p. 318, which however more probably belongs to Mermis DUJARDIN. 



