OF THE BEACHION^EA. 



707 



distinct classes of eggs — viz. winter, summer, and male ova- 

 their form and aspect. 



-all differing in 



Genus NOTEIJS (XXXV. 491-494; XXXYIII. 25).— Eyes absent; foot 

 furcate (Brachmii wanting eyes). The two-wheeled trochal disc has between 

 its portions a three-lobed ciliated brow, but has no long bristle-like feelers ; it 

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

 both anteriorly and posteriorly ; an oesophageal head with jaws having many 

 teeth (poli/gomphia), a constricted alimentary canal or stomach (gasterodela) 

 with two large glands, an ovarium, and a contractile vesicle are to be recog- 

 nized. There is also a trace of tremulous tags, a short and thick water- 

 vascular tube, and a large central ganglion, lying between the muscles of the 

 vibratory organs. Dujardin considers the absence of eyes insufficient to 

 constitute this a genus apart from Brachionus. 



NoTEUS quaclricornis (xxxv. 491-494 ; 

 xxxvin. 25). — Lorica suborbiciilar, de- 

 pressed, rough and m'ceolated, with fom* 



siphon between the large spines on the 

 front of the body. This animalcule is 

 large, very transparent, and of a whitish 

 colom-. (xxxv. 491-493 represent dorsal, 

 ventral, and side views ; and 494 the 

 jaws separate, and under pressm'e.) 

 Found amongst decayed sedge-leaves 

 and Oscillatorise. 1-120" to 1-72". 



spines anteriorly and two posteriorly. 

 Rotary organ simple, with a deep oral 

 fossa ; three lobes on its free surface. 

 Alimentary canal as in Brachionus. A 

 contractile sac on the right of the cloaca 

 giving off two canals, each bearing three 



Genus ANUR-^A (XXXV. 495-498).— Brachionaea with a single cer\ical 

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

 four longitudiual rows of facettes upon the back ; in three it is smooth ; in. 

 thirteen species it is spinous anteriorly, and in seven posteriorly also. A. 

 biremis has a moveable spine on each side : of one species, only the empty 

 shell has been seen ; in the rest the muscles of the rotary organ, but not the 

 longitudinal muscles of the body, have been observed. Jaws and teeth are 

 seen in nine species. Alimentary canal constricted {gasterodela) in four ; 

 simple and conical (coelogastrica) in nine. Two glands are placed at the 

 commencement of the alimentary canal ; an ovary is seen in twelve species, 

 but a contractile vesicle only ia one of the larger and smooth species, in which 

 also four tremulous tags are found. In three species siphons emanate from 

 the neck. The eye-speck, which is always present, is supposed to indicate 

 the existence of a nervous system. In A. squaniula, A. curvicornis, A. biremis, 

 A. striata, and A. foliacea, what is thought to be nervous matter is seen below 

 it. Eight species have their eggs attached to them after they are expelled. 

 They swim freely, though not very quickly. This genus has the name of 

 Anourella, given to it by Bory St.-Vincent, and retained by Dujardin. 



a. Species posteriorly devoid of spines a7ul pedicle. 



Anttrjea (?) quadridentata. — Lorica 

 oblong, with four homs anteriorly, its 

 posterior end obtuse, back tessellated. 

 1-216" without the homs. 



A. Squamida (Brachionus Squamula, 

 M.). — Smooth, obtusely square, with six 

 horns in front, obtuse behind, (xxxv. 

 495-497 represent different views of this 

 animalcule, the two latter with an egg 

 attached.) 1-240". 



A.falcata. — Oblong ; with six spines 

 anteriorly, the two central of which are 



curved outwards, like sickles. Sm'face 

 of the lorica not ridged, but rough ; pos- 

 terior extremity obtuse. 1-144". 



A, curvicornis. — Nearly square, with 

 six frontal horns, the two middle ones 

 larger and curved outwards and down- 

 wards. Dorsal surface tessellated ; its 

 large, red, roimd eye is seated upon a 

 large nervous ganglion ; the oesophageal 

 bulb has three-toothed jaws. This ani- 

 malcule also canies the eggs attached. 

 1-216". 



2z2 



