Brachionaca.'] infusorial animalcules. 675 



Genus NoTEUs. The egg-carrying Brachionaea arc destitute of 

 visual organs, but provided with a furcate foot {Brachioni wanting 

 eyes.) The two-wheeled vibratory organ has between its portions 

 a three-lobed ciliated brow, but has no long feeler bristles ; it 

 possesses (as also the furcate foot), distinct muscles. The lorica has 

 spines both anteriorly and posteriorly; an oesophageal head, with 

 jaws, having many teeth {j)oJggomp1iia), a constricted alimentary 

 canal or stomach {gastcrodela), -nitli two large glands ; an ovarium, 

 two sexual glands, and a contractile vesicle, are to be recognized 

 There is also a trace of tremulous gills, a short and thick respiratory 

 tube, and a large central ganglion, Ijing between the muscles of the 

 vibratory organs. The absence of ejes Diijardin considers in- 

 sufficient to constitute this genus, apart from Brachtonus. 



N. quadricornis. — Lorica sub-orbicular, depressed, rough (scabrous), 

 and urceolated; it has anteriorly four horns, posteriorly two spines. 

 This animalcule is large, very transparent, and of a whitish colour. 

 Figs. 491 to 493 represent dorsal, ventral, and side views; and fig. 

 494 the jaws separate, and mider pressure. Found amongst decayed 

 sedge-leaves and Oscillatoria. Length 1-1 20th to l-72nd. 



Genus Anueaea. — Includes Brachionea having a single cervical 

 eye, but no foot {Brachioni without feet.) In seven species the lorica 

 has facettcs upon the back, in four longitudinal Unes : in thix'c it is 

 smooth ; in thirteen species it is spinous anteriorly ; and in seven 

 postericrly also. A. hiremis has a moveable spine on each side : one 

 species is found as an empty shell only ; in the rest rotatory organs, 

 with their cilia, as often also their muscles, are seen ; but no longi- 

 tudinal muscles have been observed in any of the species. Jaws 

 and teeth are seen in nine species. Alimentary canal constricted 

 {gasterodela) in four ; simple and conical (coelogadrica) in nine. They 

 have two biliary glands at the commencement of the alimentary 

 canal ; an ovaiium 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 ti'emulous gill- like organs are found. In three species 

 respiratory tubes emanate from the neck. The eye, which is always 

 present, indicates the existence of a nervous system. In A. squamula, 

 A. curvicornis, A. hiremis, A. striata, and I^.foliacea, nervous matter 

 is seen below it. Eight species have theu- eggs attached to them 



