368 DESCRIPTION OF IRotaforia. 



genus, are seen. Found amongst conferva. Length 

 l-]20th. 



622. Synch AETA Baltica. The Baltic Syrichaeta. — 

 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-lOOth. 



623. Synchaeta oblonga. — 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 1-1 00th. 



624. Synchaeta tremula {Vorticella tremula, M.) The 

 tremulous Si/nchaeta. — Body truly conical, with six rota- 

 tory clusters, four styles ; crest none. Length about 

 l-160th. 



Genus CLVL Scaridium. The Springei- 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 oesophagal 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, at 

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



