1 62 



SECRETS OF EARTH AND SEA 



soon after he had discovered it, I could not believe 



my eyes, and thought I must 

 be dreaming. It is very 

 like the young form of 

 Crustaceans known as a 

 "Nauplius" (see tail-piece to 

 the present chapter) in having 

 (what no other wheel animal- 

 cule has) great hollow paired 

 limbs moved by striated mus- 

 cular fibre, carrying fringed 

 hairs only known before in 

 Crustaceans (crabs, shrimps 

 and water fleas), and striking 

 the water violently just as do 

 those of the Nauplius. And 

 yet all the while it has on its 

 head a pair of large ciliated 

 wheels which serve it just 

 as do those of the com- 

 mQn Rotifen No Crustacean, 



hairs terminating the great vent- 

 ral limb are seen, and the three 



FIG. 36. The Rotifer Pedalion 



W ^-seen from the ventral 



surface. Letters as in Fig. 35. 



The complete fan of eight fringed 7 oun g or old > has thls wheel - 



apparatus " nor any Vlbratile 

 c jij a on t h e surface of its 



^dy. Pedalion possesses an 



two ventro-lateral limbs, /./. 2 , are astounding " blend " of char- 



acters. Fig. 35 shows, besides 



thfi paddles or legs ( of 



. , 

 whlch two on the other Slde 



of the animal are not seen), 



t he broad and large wheel- 

 TT T / .,,. ,. u 



apparatus W (within wh,ch 



the right eye-spot r.e. is seen), 

 and a little lobe (p) called the "chin" lying just below 

 the mouth (m). The big leg (^./.) and the pair on each 



omitted; they are fully shown 



in Fig. 35 and are the same in 

 number and disposition as those 

 forming the "fan" of the great 



ventral limb. Compare these 



hairs with those of the "Nauplius" 

 Crustacean larva drawn as a tail- 



piece to Chapter xill. 



