Brachionaea.] THE INFUSORIA. 411 



under pressure. Found amongst decayed sedge-leaves and 

 oscillatoria. Length l-120th to l-72nd. 



Genus CLXXXVI. Anuraea includes Brachionaea 

 which have a single cervical eye, but no foot (Brachioni with- 

 out feet.) In seven species the lorica has facetta upon the 

 back, in four longitudinal strise : in three it is smooth, in 

 thirteen species it is spinous anteriorly, and in seven pos- 

 teriorly also. A. biremis has a moveable spine on each 

 side : one species is found as an empty shell only ; in the 

 rest the rotatoiy organs, with their cilii, as also often their 

 muscles, are seen, but no longitudinal ones have been ob- 

 served in any of the species. Jaws and teeth are seen in 

 nine species. A constricted alimentary canal {gasterodela) 

 in four, and a simple conical one [coelogastrica) in nine. 

 They have two biliary glands at the commencement of the 

 alimentary canal; an ovarium is seen in twelve species, 

 but sexual glands and a contractile vesicle only in one of 

 the larger and smooth species, in which also four tremu- 

 lous gill-like organs are found. In three species respi- 

 ratory tubes emanate from the neck. The eye, which is 

 always present, indicates the existence of a nervous sys- 

 tem. In A. squamula, curvicornis, biremis, striata, and 

 foliacea, nervous matter is seen below it. Eight species 

 have their €ggs attached to them after they are expelled. 

 They swim freely, though not very quick. 



(a). — Species posteriorly devoid of spines and pedicle. 



707. Anuraea (?) quadridentata. The four-horned Anu- 

 raea, — Lorica oblong, with four horns anteriorly, the pos- 

 terior end obtuse, back tesselated. Length 1-2 1 6th, with- 

 out the horns. 



