414 DESCRIPTION OF {Rotatoria. 



two middle ones long and curved ; it has two short spines 

 at the posterior angles, which are sometimes scarcely 

 apparent. The surfaces are rough, and the dorsal also 

 tesselated, like the preceding species. Independent of 

 the two wheels, the brow has three cylindrical ciUated pro- 

 cesses, truncated at their extremities. Length 1-2 16th. 



719. Anuraea aculeata {Brachionus quadratus, M.) 

 The spinous Anuraea has a square lorica, with six spines 

 anteriorly, the two middle longest ; at the posterior angles 

 are two long and equal spines ; the back is rough and 

 tesselated, the under side smooth. At the brow, between 

 the two wheels, is a single ciliated frontal process ; a little 

 respiratory tube is situated in front of the eye. Length 

 l-144th; including the spines, l-96th. 



720. Anuraea valga. The hobbling Anuraea. — Lorica 

 nearly square, with six spines anteriorly, the two middle 

 ones longest ; at the two posterior angles is a spine of un- 

 equal length ; the dorsal and ventral surfaces are rough, 

 the former tesselated. The jaws are five-toothed, the red 

 eye oval, its longer axis being tranverse. Length, without 

 the spines, 1-2 10th. 



Genus CLXXXVIL Brachionus. Brachionaea which 

 have a single cervical eye and a furcated foot. In all the 

 species the lorica is a closed shell, with two openings like 

 a tortoise-shell (testula), the margin of whose anterior 

 opening is toothed, as also, sometimes, that of the poste- 

 rior. In B. bakeri and militaris, the lorica is rough, and in 

 the former tesselated ; in all the other species it is smooth ; 

 within its lorica the animalcule can completely withdraw 

 itself. The locomotive organs consist of a double rotatory 

 apparatus and a wrinkled and very flexible furcated foot. 



