640 DESCEiPTiON OF \_Iiotatoria. 



Dr. Ehrcnberg at Berlin, from Kiel, the luminous property existed, 

 but this sj)ecies, though present, did not evolve any light. Dr. 

 Michaelis, however, has noticed the production of light from this 

 Synchaeta, and Dr. Ehrenberg thinks it only takes place when 

 developing ova. Length 1-1 00th. 



Synchaeta oblonga. — Body oblong, with six rotatory clusters, and 

 four styles ; crest sessile and single. Distinguished from the following 

 by the form of the pancreatic glands. Found amongst Conferva, in 

 spring. Length about 1-lOOth. 



S. tremida [VorticeUa trernulct, M.) — Body ti'uly conical, with six 

 rotatoiy clusters, four styles; crest none. Length about l-160th. 



S. mordax (Gosse.). — Body conical, subventricose ; toes minute; 

 auricles large, pendent ; principal styles four ; the larger (or lateral) 

 pair sometimes branched ; eye rather small, brilliant ; two pairs of 

 protrusilc snapping jaws. Length l-72nd. 



Genus Scaeidium. TJw Simnger. — Ej'e cervical, single, flat, 

 lenticular, the compound rotatory organ armed in front with an 

 imcinus, or hooked bristle ; foot forked, very long, and adapted for 

 leaping or springing — hence the name. An oblique oesophageal head, 

 with unequal, double-pointed (single) teeth to the jaws ; a short, 

 narrow oesophagus, opening into a simple, wide, conical, alimentary 

 canal, with two spherical pancreatic glands, constitute the nutritive 

 system. Posteriorly, about the intestine, are a ball-like ovarium 

 and a contractile vesicle; the foot has two club-shaped muscles ; a 

 central ganglion exists between the rotatory lobes ; the ajiparent 

 articulations of the foot are very remarkable. 



S. longicauduvi {Triclioda longicauda, M.) — Foot twice as long as 

 the body, toes half as long as the foot ; the animal springs or leaps 

 quickly, by a rapid movement of the foot; it does not appear to 

 have a lorica, and is remarkable from all other Rotatoria by the 

 length and bending in of the foot, which, as also the body, is covered 

 with a stiff skin. Behind the eye is a transverse fold in the neck, 

 where the head draws itself into the body ; the foot has also a trans- 

 verse fold when it bends. Fig. 423 ropi'csents the animalcule ex- 

 tended (right side) ; fig. 424 the oesophageal head, with unequal 

 jaws, &c., extended by pressure. Found amongst Oscillatoria. 

 Eutil'C length of the body l-72ud; without the foot, 1-2 16th. 



