Hydalinaea.] TH E INFUSORIA. 361 



the animalcules. They live upon other Rotatoria, upon 

 the polygastric infusoria, and even in the globular masses 

 of Volvox globator; but, says Ehrenberg, "not like a 

 cuckooes egg in a hedge-sparrow's nest, but like the bear 

 and the bee-hive, or a bird's nest in a wasp's nest." 



(a). Sub-genus LABIDODON. One tooth in each jaw. 



594. NOTOMMATA myrmeleo. The bell Notommata. 

 Body large, bell- shaped ; foot short, lateral ; teeth curved 

 in a circular forceps-like manner. (See Jig. 420.) There 

 are two varieties : in the one (var. a) a long thin oesopha- 

 gus, a globular thick stomach, and a long empty rectum, 

 compose the alimentary organs. Ehrenberg, by pressure, 

 made an animalcule, whose dark stomach nearly filled the 

 body, disgorge two large specimens of Lynceus minutus 

 (described and figured in the Microscopic Cabinet} ; the 

 animalcule afterwards vibrated away in a lively manner. 

 No respiratory tubes exist, but five transverse vessels and 

 four longitudinal ones (a pair uniting to each of the first 

 two transverse ones,) represent a vascular system in this 

 variety. In the other (var. j3) a distinct vascular net- 

 work is seen at the head, but only four transverse vessels, 

 and two longitudinal ones, going to the first. The red eye 

 is much larger in this variety. Fig. 418 represents a side 

 view of the variety /3, in which the various parts of its 

 organization, as heretofore described, is clearly seen, as 

 also a small crustacean, within its stomach. Fig. 420 

 shews the structure of the manducatory organs separated. 

 Fig. 419 is the upper part of an animalcule (var. a), shew- 

 ing the smaller eye, rotatory organs, teeth, and network. 

 Found in clear water, in turf hollows. Length l-40th. 



