Srachionaea.] ixfusorial AXtMALcrriES. 677 



posterior extremity, having anteriorly six sharp-pointed horns or 

 spines, twelve longitudiual rays on the back. Found amongst 

 Conferva. Length about 1-1 20 th. 



AiiWTeiXF.iS.foIiacea. — Lorica oblong, six spines anteriorly, posteriorly 

 terminating in a spinous manner, like a pedicle, dorsal and ventral 

 surfaces longitudinally striated, frontal region rough. It has four • 

 toothed jaws, and a central ganglion below the eye. Length 

 l-180th. 



A. stipitata {Brachionus.) — Lorica nearly square, or triangular, 

 anteriorly six spines ; posterior pointed like a pedicle, the back tesse- 

 lated. Fig 498 represents a dorsal view, with the wheels extended. 

 Length about 1 -200th. 



A. testudo. — Lorica square, having anteriorly six sti-aight spines, 

 all nearly the same length, and posteriorly a short one at each corner. 

 The upper and under surfaces are rough, the former tessclated like 

 Noteus. Length about 1 -200th. 



A. serruhta. — Lorica ovate, square, with six unequal spines an- 

 teriorly, the two middle ones long and curved; it has two short 

 sjnnes at the posterior angles, which are sometimes scarcely appa- 

 rent. The surfaces are rough, and the dorsal also tcsselated, like 

 the preceding species. Independently of the two wheels, the brow 

 has thi'ee cylindrical ciliated processes, truncate at their extremities. 

 Length l-216th. 



A. aculeafa {Brachionus quadratus, M.) — Lorica square, with six 

 spines anteriorly, the two middle longest ; at the posterior angles are 

 two long and equal spines ; back rough and tesselated, under side 

 smooth. At the brow, between the two wheels, is a single ciliated 

 frontal pi'ocess ; a little respiratory tube is situated in front of the 

 eye. Length 1-1 44th ; including the spines, l-96th. 



A. valga. — Lorica nearly square, with six spines anteriorly, the 

 two middle ones the longest : at the two posterior angles is a spine 

 of unequal length ; dorsal and ventral surfaces rough, the former 

 tesselated. The jaws are five-toothed, the red eye oval, its longer 

 axis transverse. Length, without the spines, 1 2101h. 



The following species are given by Mr. Gosse (Annals Nat. Hist., 

 vol.8, 1851.) 



A. fism (Gosse.) — Lorica smooth, hyaline, swollen at the sides 



