368 DESCRIPTION OF [Rotatoria. 



genus, are seen. Found amongst conferva. Length 

 1- 120th. 



622. SYNCH AETA Baltica. The Baltic Synchaeta. 

 Body ovate, rotatory clusters and styles four each ; crest 

 single, sessile. This creature is supposed to occasion a 

 luminous phosphorescent appearance in the ocean. In 

 two samples of water received by Dr. Ehrenberg at Berlin, 

 from Kiel, the luminous property existed, but this species, 

 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 -100th. 



623. SYNCHAETA ob/onga. Body oblong, with six ro- 

 tatory 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 l-100th. 



624. SYNCHAETA tremula (Vorticella tremula, M.) The 

 tremulous Synchaeta. Body truly conical, with six rota- 

 tory clusters, four styles ; crest none. Length about 

 l-160th. 



Genus CLVI. SCABIDIUM. The Springer has a single, 

 flat, lenticular eye at the neck, the compound rotatory 

 organ, armed in front with an uncinus, or hooked bristle, 

 the foot forked, very long, and adapted for leaping or 

 springing hence the name. An oblique ossophagal head, 

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

 short, narrow resophagus, opening into a simple, wide, 

 conical, alimentary canal, with two spherical pancreatic 

 glands, constitute the nutritive system. Posteriorly, at 

 the intestine, are a ball-like ovarium and a contractile 



