Brackioha'ea.1 infusoriai animalcules. OSl 



"BRxcTnomjspoIf acanthus (M. ) — Lorica smooth, having anteriorly four 

 long dorsal teeth or spines, six short ones at the margin of the chin, 

 (venti-al), and, posteriorly, five dorsal spines, the two external or 

 lateral ones very long. Fignres 499 to 501 rcpi'esent dorsal, side, 

 and under views of this animal; the first having the wheels 

 extended, and the side view showing the respiratory tube and an 

 ovum attached. (Length, without spinesj 1-1 10th.) 



B. militaris. — Lorica rough (scabrous), with twelve long and 

 nearly equal spines anteriorly, and four posteriorly ; the two middle 

 ones unequal, and shorter tlian those of the preceding species^ 

 Length, without spines, 1-1 20th. 



B. Oon (Gosse.) — Lorica ovate, the back swelling with an unifomi 

 cui've, by which it is distinguished from B. pala, which is truncate 

 or slightly cavate posteriorly ; anterior spines four, straight, wide at 

 the base, and pointed j the occipital pair taller than the lateral. 

 Lorica 1-1 25 th. 



B. dorcm. — Lorica ovate, or sub-conical occipital edge, with four 

 long slender spines, the middle pair ciu'ving forwards, and bent first 

 from, and then towards each other, like the horns of an antelope ; 

 mental edge undulated, with a notch in the centre. Lorica l-60th. 



B. heptato7nm. — Lorica ovate, rccipital edge cut into six saw-like 

 teeth, much shallower than in B. IfilUen, with the central notch 

 deeper and rounder than the rest ; mental edge with four rounded 

 lobes, separated by notches; posterior extremity with two nipple-like 

 points, biliaiy (or pancreatic) glands veiy large, and cleft into two 

 lobes almost to their base ; hence the name (heptatomus — seven 

 cleft.) Lorica l-103rd. In sea-water, mouth of the 'Neezc, Essex. 



B. angtihris. — Lorica hexagonal-oval, in a dorsal aspect ; occipital 

 edge with two small teeth, divided by a rounded notch (in some 

 specimens there are obsolescent traces of a lateral pair) ; mental edge 

 slightly undulated, sometimes with two low points, divided by a notch 

 like the occiput, but stiU more faintly ; posterior extremity with two 

 short, blunt, well-marked processes. The general surface is roughened 

 with angular ridges, and is sometimes sub-opaque and brown« 

 Lorica 1 -200th. This cuiious species has relations with Noteus and 

 with Pterodina. 



Genns Piekodina. The winged Rotatoria include Urachionaea, 



