Microscopical Essays. 589 



®r draw in the orbicular membrane at pleafure. In fome there 

 are four articulations to the tail, in others five ; it has two pair 

 of briftles, or projecting parts, one placed at the fecond joint, 

 the other at the laft. It has been found very often in marfhy 

 waters. In Fig. 6 it is feen with the mouth open, in Fig. 5 with 

 it fhut, a the jaws, b the firft briftles, c the fecond pair, d the 

 fpine at the tail. 



231. Trichoda Clavusv 



Trichoda antice rotundata, crinita poftice acuminato-caudata.. 

 The fore-part round and hairy, the hind-part furnifhed with a 

 fharp-tail. This animalculum is not much unlike in Ihape to a&s 

 common naiL 



232. Trichoda Cornuta. 



Trichoda fupra convexa, fubtus plana, apice crinita, cauda; 

 lineari flmplici. Trichoda with the upper part convex, the un- 

 der fide plain, the apex hairy, the tail linear and fimple. 



To thefe characters we may add, that the body is membrana- 

 ceous, elliptical, crammed with molecules, the fore-part lunated, 

 the hinder-part round, and terminated with a tail as long as the 



Body, 



233.. Tri* 



