72 GENEBAt HI8T0ET OF 



several styliform processes, moveable, but not ciKated ; examples of 

 siich organs are to be found in Salpina, (figs. 447-453) Monostyla, 

 (figs. 434-437) and Brachionm, (figs. 499-501.) In Floscularia (figs. 

 384-385) indeed, five to six lobes, with long radiating cilia, consti- 

 tute tbe so-called rotary organ of that animal ; whilst Stephanocerm 

 (fig. 383) ofiers a still wider departure from the normal form, in 

 having five long ciliated arms proceeding from its head, and no true 

 rotary apparatus existing, thus establishing a great affinity, in external 

 form, with the Bryozoa, or CUiobrachiate Polypes. 



Although the true Rotatoria are destitute of locomotive members 

 on their under surface, yet an approach to such organs is indicated 

 in the toes, or pincer-like processes of the tail, before alluded to, as 

 attached to its extremity, and sometimes, in addition, to one or more 

 of its segments. If the Tardigrada (see end Part III.) of Dujardin, 

 be admitted among the Rotatoria, then the latter will comprehend 

 animals with distinct, rudimentary legs or feet, by means of whicli 

 they can crawl. 



Besides the rotary organ, and the tail with its appendages, other 

 special instruments are met with in the stiff-bristles, (cirrhi) of Poly- 

 arthra (figs. 401-425) and Triarthra (figs. 406-408), in the former, 

 fixed on each side of the neck, and moved after the manner of oars ; 

 in the latter, articulated on the under surface of the body, and giving 

 the animal a very active leaping movement, Hke that of a flea. 



The true telescopic tail is wanting in several genera and species, 

 as Anuraa; others have a short pincer-like process, as Clvxtonotus, 

 (figs. 357-358) Eosphora, (fig. 415) Cycloglma, (figs. 425-426), &c. ; 

 others, two long styliform processes, as Notommata longiseta, (fig. 421) 

 N. Felis, &c., whUst others again have a single style of greater or 

 less length, as Rattulus, (fig. 409) Monocerca, (fig. 399-417) Mo- 

 nostyla, (figs. 434-437) and Mastigocerca, (fig. 438-440.) 



But besides the locomotive Rotatoria, there are fixed forms, many 

 of which have a posterior prolongation, rather deserving the term 

 pedicle or stem, than that of tail or foot-like process. This pedicle 

 is contractile throughout, or only in part, corrugating itself, and 

 having no sliding segments ; examples are seen in Tuhicolaria, (figs. 

 370-382) Stephanoceros, (fig. 383) Limnias, (fig. 388-392) and Meli- 

 certa, (fig. 386-387.) The contractility of the foot enables these 



