684 



SYSTEMATIC HISTOEY OF THE INFUSORIA. 



gards it as cerebral. Muscular system 

 complex (xxxvi. 5, 6). Six or seven 

 muscles are circular and transverse 

 (6 1) ; others, arranged longitudinally 

 (5/), are attached to various internal 

 viscera and to the integument. Some go 

 to the occipital sac, others to the gizzard 

 and to the foot, effecting various motions 

 in all these organs. Gosse observes, '' It 

 commonly keeps the ear-like lobes con- 

 cealed whilst crawling, but will often 

 suddenly protrude them, and in the same 

 instant shoot off through the water with 

 considerable rapidity and with a smooth 

 gliding motion, partially revolving on 

 the longitudinal axis as it proceeds." 



Leydig observes that the alimentary 

 canal consists of two portions — stomach 

 and intestine. 1-70". Amongst Con- 

 fervse, &c. ; also beneath ice. (xxxvi. 

 3-7.) 



N. gihha. — Back swollen, front trun- 

 cated, not auricled, no cerebral sacculi 

 below the eye : toes short ; the -vdbratile 

 organs compound. In old exposed in- 

 fusions. 1-200". 



N. ansata ( Vorticella aurita, M.). — 

 Turgid in the middle, suddenly trun- 

 cated at both ends ; the front auricled, 

 no cerebral saccidi below the eye ; toes 



b. Suhge7ius Cteis'ODOK 



N. clanilata. — Bell-shaped ; foot coni- 

 cal, very short; pancreatic glands of a 

 club-shape. This creature presents great 

 facility for observing its internal struc- 

 ture ; but the limits of this work preclude 

 details. Mr. Gosse kindly informs us 

 that he has distinctly seen in it a nor- 

 mal intestine terminating in the cloaca. 

 1-96". 



N. Tuba. — Conical, trumpet-shaped, 

 dilated anteriorly ; foot furcate and 

 acute. It resembles, in form, Stentor 

 Mulleri, but is more active. 1-120". 



N. Brachionus. — Dilated, nearl}^ square, 

 depressed, foot slender, eggs pendulous. 

 This creature appears to have a shell, 

 but Dr. E. says it has not. Ehrenberg 

 described his N. granulans as depositing 

 its eggs upon N. Brachionus, whence he 

 concluded that the former, like the 

 cuckoo, left its young to be reared by 

 another creature. He found that some of 

 the eggs on the dorsal surface of N. Bra- 

 chionus produced N. granularis. Leydig 

 solves the mystery by affirming that the 

 latter species is the male of the former, 

 the animal in this case being bisexual, 

 not hermaphrodite. 1-96". 



N. tripas. — Oval, subtruncated, and 

 slightly auricled in front. Dark red eye- 



thick. In bog- water, amongst Confervae. 

 1-120". 



N. decipiens. — Cylindrical, not au- 

 ricled; toes short; the ovarium often 

 contains four large eggs. Perty thinks 

 this is only the young of some other 

 species. 1-180". 



N. (?) Felis. — Small, slender ; one horn 

 in front ; eye colourless ; back attenu- 

 ated posteriorly, and forked. 1-240". 



N. (?) Tigns {Trigoda Tigris, M.) 

 (xxxiu. 421). — Cylindrical, ciiiwed, foot 

 half the length of the body ; toes very 

 long, and curved downwards; it has a 

 little horn in fi'ont ; the eye is large and 

 red. Perty has found many examples 

 without the red eye. Amongst Oscil- 

 latoriffi. 1-72". 



N. longiseta {Vorticella longiseta, M.). 

 — Cylindrical, truncated anteriorly ; toes 

 styliform, unequal, and two to four times 

 longer than the body. It is active, and 

 frequently leaps, being assisted by its 

 long claws, which resemble tails. Fig. 

 421 is a full-gro^\^l specimen. Entire 

 length 1-60". 



N. cequalis {Vorticella longiseta, M.). 

 — Cylindrical, obtuse in front ; toes sty- 

 liform, equal the length of the body. 

 l-]20". 



— Jaws many -toothed. 

 speck with three chalky masses, giving 

 the organ a trilobed appearance. Foot 

 apparently trifid, but not really so, the 

 central lobe being only the prolonged 

 back of the animal. 1-200". 



N, saccigera. — Elongated, cylindrical, 

 attenuated posteriorly ; fork short. It 

 has a curious internal pouch beneath the 

 eye, with a gi'oup of rounded vesicles 

 in front of the stomach, recalling, as 

 Perty observes, the pretended agglome- 

 ration of eyes in Theorus. 



N. Copeus. — Large, attenuated at both 

 ends; tail small and indurated. This 

 curious creature has a long bristle on 

 each side of its body ; and on each side 

 of the head a stout process, called by 

 Ehrenberg an auricle, fringed with vibra- 

 tile cilia at its ends, and, like the setse, 

 standing out at right angles to the body ; 

 a thick gelatinous substance covers the 

 body; the back terminates in a some- 

 what hard point, which is a true tail, 

 between which and the foot the dis- 

 charging opening is situated. When 

 creeping, the large vibratile arms are 

 withdrawn, but it vibrates with the 

 frontal cilia and proboscis, (xxxin. 416 

 represents the creature extended.) 1-36". 



N. centrura (xxxviii. 26).— Body large, 



