684 



DE3CBIPTION OF 



[Tardiffrada4 



Class III.— TAEDIGRADA. 

 8 



TARDIGRADA, OR LITTLE WATER BEARS. 



Figure 1. — Emydium, magnified 130 diameters. Figure 2. — 

 Head of the same, magnified 300 times. Figures 3, 4. — Tardigrada 

 magnified 160 times. Figure 5. — Head of same, magnified 300 

 times. Figure 6. — Mouth apparatus of Macrobiotus, greatly 

 magnified. 



The creatures named above, are introduced here as a class, inasmuch 

 as they cannot be included with the Rotatoria. Some remarks on 

 their organization will be found in Part I. of this work ; and here 

 I shaU introduce further particulars, chiefly from my work of 1834, 

 page 1 82, and from thatof Dujardin's {Hist, des Infusoins ■p. 661.) They 

 have oblong bodies, contracting into a ball ; furnished with four pairs of 

 short feet or mammilliform processes, each terminated by simple or 

 double hooked claws; mouth very narrow, syphon-shaped ; with an 

 internal maxillary apparatus composed of two lateral moveable pieces, 

 and of a strong muscular oesophageal bulb, furnished with horn- 

 like dental articulated processes 



