680 



SYSTEMATIC niSTORY OF THE INFUSORIA. 



the Furcularice : — 1. F. furcata=Diglena caudata (Ehr.), Diglena capitata, 

 and Furcidaria gracilis ; 2. F. marina, of the same size and form as the 

 preceding, but marine, and distinguished fui^ther by the styles of its tail, 

 which are twice as short, and by its three-toothed but acute jaws, resembling 

 a hook ; 3. F. forcipata, placed by Ehi^enberg among the Diglenoe ; 4. F. 

 grandis= Diglena grandis (Ehr.); 5. F. forficida, with which must also be 

 associated Distemma foi^Jicula ; 6. F. canicida, which Ehrenberg with doubt 

 refers to Diglena ? aurita ; 7. F. najas, to which belong the various Systo- 

 lides, more or less hke Hydatina in their club-shaped form and articulated 

 tail, such as Notommata petromyzon, N. najas, N. gihha, and probably also 

 Eospliora najas, E. digitata, and E. elongata (Ehr.). We moreover refer 

 provisionally to the genus Furcidaria several other Systolides considerably 

 dissimilar in form, some being very long, with two very long styles, of which 

 Ehrenberg makes his Notommata longiseta, and N. ceqiialis, and his genus 

 Scaridium; whilst others have an ovoid, thick body, rounded posteriorly, 

 truncate in front, and with a short oblique tail, which Ehrenberg calls 

 Notommata myrmeleo and N. syrinx, 



" All these Furcidaiice, except F. marina, to which F. Reinhardtii of Ehren- 

 berg must probably be added, have been foimd in fresh water ; but it is most 

 likely the number of those living in the sea are much more numerous ; and I 

 have indeed myself met with three or four distinct species, which I have 

 from want of time not yet described," 



FuRcrLARiA gihha. — Oblong, slightly 

 compressed, under side flat, back convex, 

 toes forked, long (styliform), equal to 

 half the body ; the eye is placed upon a 

 nervous ganglion over the mouth, clearly 

 indicating the dorsal sm-face; the ova- 

 rium has generally one large and ripe 

 ovum. The movement of this animal- 

 cule is somewhat slow. Found in 

 green water, and amongst Confervse. 

 1-69". 



F. jReinhardtii. — Fusiform, truncated 

 in front ; foot elongated, cylindrical, and 

 shortly furcate at the end ; a slight 

 stricture divides the body and head. 

 XXXIII. 397 represents an animal ex- 

 tended, and 398 another, contracted ; 

 the former is a side (right), the latter a 

 back view. Parasitic upon Monopyxis 



(Sertularia) qenicidata, in sea-water. 

 1-120". 



F. Forjicida, — Cylindrical, obtusely 

 pointed in front, rounded and dentated 

 at the base, on the upper side ; the toes 

 very long ; the rotary organ appears to 

 have two frontal clusters of cilia near 

 the eye, and a wheel-like bundle on 

 each side. 1-144". 



F. gracilis. — Slender, cylindrical, sud- 

 denl}^ attenuated at the base of the 

 furcate foot; toes straight, long, but 

 shorter than half the body. The rotary 

 organ appears disposed on six muscular 

 masses. 



F. C(eca (Gosse). — Cylindrical ; eye 

 wanting, or not discernible ; toes slender, 

 obtuse. Length, including toes, 1-135". 

 Learning-ton. 



Genus MOXOCERCA (XXXIII. 399-417).— Eye single, seated upon a 

 ganglionic mass, conical ; foot simple, styliform, resembling a tail. In two 

 species the vibratile cilia are distributed into about six bundles, their band-like 

 longitudinal muscles and those of the^ foot producing locomotion ; the sides 

 of the oesophageal head are unequal, as also the two jaws, which have one or 

 two teeth ; the oesophageal tube is curved and long, and the simple alimentary 

 canal conical, mth two ear-like glands anteriorly. An ovary and a con- 

 tractile vesicle are evident. In two species a tube projects from the frontal 

 region. 



MoxoCERCA Rattus (Trichoda Raftus, 

 M. ; Rattidiis carinatus, Duj.). — Ovate, 

 obong, truncated anteriorly, and im- 

 armecl ; foot styliform, the length of the 

 bodv. This creature swims slowlv, in a 



stiff' manner ; when stationary it throws 

 the styliform foot backwards and for- 

 wards.' The ovary has a reddish coloui'; 

 behind it hes a roundish contractile 

 vesicle. The foot has a short base, with 



