Brachionaea.} T IIE INFUSORIA. 417 



725. BRACHIONUS Mulleri. Mutter's Brachionus has a 

 smooth lorica, with six obtuse spines in front, and termi- 

 nated by two short ones, resembling papillae. This species 

 is somewhat larger than B. urceolaris, and has peculiarly- 

 shaped frontal spines. The margin of the chin (brow) is 

 smoothly truncated, having three faint indentations. The 

 lorica is yery transparent. Length I -60th. 



726. BRACHIONUS brevispinus. The short-spined Bra- 

 chionus has a smooth lorica, having six acute unequal 

 spines in front, and four stout spines posteriorly, the two 

 inner ones short; two sexual glands and a contractile vesicle 

 are present. Found in slow running clear water, with 

 conferva. Length l-65th. 



727. BRACHIONUS Bakeri (M.) Baker's Brachionus 

 has a rough lorica, the middle of which is tesselated on its 

 dorsal surface; six unequal acute teeth anteriorly, two 

 elongated (lateral and dorsal) spines posterior, and short 

 ones at the sheath of the foot. The lorica is covered with 

 delicate granules ; those upon the middle of the ventral 

 surface are arranged in parallel but somewhat curved lines. 

 Length 1-1 20th to l-60th. 



728. BRACHIONUS poll/acanthus (M.) The many-spined 

 Brachionus has a smooth lorica, having anteriorly four long 

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

 chin (ventral), and, posteriorly, five dorsal spines, the two 

 external, or lateral ones, very long. Figures 499 to 501 

 represent dorsal, side, and under views of this animalcule ; 

 the former having the wheels extended, and the side view 

 shewing the respiratory tube and an ovum attached. 

 Length, without spines, 1-1 10th. 



729. BRACHIONUS militaris. The armed Brachionus 



2E 



