700 



SYSTEMATIC HISTOEY OF THE INFUSOfilA. 



exists in all ; a contractile vesicle in two. The red eyes are situated on each 

 side, near the frontal head in two species ; in one they are yet unknown. 



The hood remains extended, even when the creature withdi^aws within its 

 sheU (XL. 8-10). 



Steph.\kops lamellaris {Bracldomis 

 la?nelIans,'!SL). — Lorica with three spines 

 posteriorly. The rapid movement and 

 transparency of this animalcide renders 

 its organization difficult to observe. A 

 process extends upwards from the oral 

 opening- and diverges into two filamen- 

 tous appendages. Leydig affirms that the 

 eye has a distinct hemispherical lens, 

 and that the alimentary canal is divisible 

 into maxillary bulb, stomach, and intes- 

 tine. The two latter ciliated. Also a 

 contractile vesicle present. (xxxI^^ 466, 

 467, different views with the crystalHne 



hood or diadem. This hood is often 

 much larger than is represented in Ehr- 

 enberg's figures.) Amongst Confervse. 

 Length of lorica about 1-300". 



S. (?) muticus (xL. 8-10). — Lorica 

 imarmed posteriorly, entire. Two eyes, 

 red. Head and tail larger in proportion 

 to the trunk than represented by Ehren- 

 berg. 1-144". 



S. ch'ratus {Brachiomis cirratus, M.). 

 — Lorica with two spines posteriorly. 

 This species has a contractile vesicle. 

 1-240". 



Genus SQUAMELLA (XXXIY. 468, 469). — Eyes four, frontal ; foot 

 furcate. The lorica is closed (testula) ; the rotary organ consists of five or 

 six muscular bulbs. In one species the oesophageal bulb has jaws, with two 

 or three teeth each; its tube in one is short, in the other long and bent 

 like the letter S. Both have a bipartite intestine (Gasterodela), with small 

 glands ; also an ovary and contractile vesicle. The eyes are disposed in pairs 

 on each side the brow. 



SQ,VAisi:Ei.i,ABractea(JBracJnomisBrac- 

 tea, M.). — Lorica depressed, broadly 

 ovate. It is very transparent ; the toes 

 thick and short, not evident. Length of 

 lorica 1-144". 



S. ohlonga. — Lorica depressed, either 

 elliptical or ovato-oblong, hyaline ; toes 



long and slender ; eyes larger than in 

 the foregoing species, (xxxn^ 468, 469 

 represent back and side views of this 

 animalcule.) In green-colom-ed water, 

 with ChlamydomonasPukisculus. Length 

 of lorica 1-280". 



Genus NOTOGOx^IA (Perty). — Body covered by a lorica which dilates 

 posteriorly; posterior margin occupied by two pointed i^rocesses on each 

 side, the shorter one being dii^ected backwards and the larger one outwards. 

 Two eyes -widely separated, on the outer margins of the anterior extremity. 

 Jaws curved, strong, with two or three teeth. Caudal setae strong and 

 bristle-like. 



NoTOGONiA Ehrenhergii. — Slightly tail, 1-14'". Motions rather brisk, re- 

 ventricose, grey. Rotary organ com- sembling those of Brachiomis, Amongst 

 posed of a single row of cilia; eyes very Confervas, 

 small, pale red. Length, including the 



FAMILY YIL— PHILODIN^A. 



This family comprehends Rotatoria devoid of lorica, but possessing two 

 simple rotary organs, resembling wheels. The body of most species is worm- 

 like, or spindle-shaped (fusiform). Portions of the body can be thrust in 

 and out, like the tubes of a telescope ; this is effected by a sort of false jorat, 

 caused by a peculiar insertion of the muscles. In aU the species the foot is 

 furcate; and in CaUidina, Rotifer, Actinurus, and PhUodhia it is provided 

 with soft processes, near the false joints, resembling horns in shape, as in 

 the genus Dinocharis (fig. 455). Muscles are seen in the genera just named. 



