CHYDORUS. 
125 
Intestine convoluted (t. XVII, f. a), having one incom- 
plete convolution and half another. Lower part of the body 
of the animal has a lobe springing out from its edge like 
a spur. Setae at the joint of the abdomen finely plumose, 
and jointed at about half their length. 
Abdomen very broad, lamellar, densely and strongly 
serrated on lower edge; sinuated deeply on anterior 
margin, and terminating in two stout claws and two 
small ones. 
The mandibles are strong, rounded towards the ex- 
tremity, which is armed with sharp teeth. The first pair 
of feet consists of a strong fleshy sort of body, ciliated on 
the upper edge, and terminating in five long and strong 
filaments, which generally project outside of the shell. 
The other feet consist of broad plates, with the branchial 
apparatus attached, and resemble a good deal those of 
the Daphnia. 
The motion of this insect is peculiar ; it generally lives 
at the bottom of the vessel in which it is kept, and when 
disturbed, it bounds up by rapid short motions in a curved 
sort of line, and then returns in the same manner to the 
place from where it rose. It is very heavy and slothful 
compared with the other genera, and I have frequently 
turned it over two or three times before it has moved. 
Hab . — Not uncommon in ponds and ditches, during 
the summer months. Near Isle worth, and elsewhere in 
the neighbourhood of London. In Yetholm Loch ; and 
pool on Bowmont Water, near Yetholm, Roxburghshire. 
Genus 2 — Chydorus. 
'JfeO 
Lynceus, Muller, et auctorum. 
Chydorus, Leach, Supp. Encyc. Brit. 
— Baird, Ann. Mag. Nat. Hist., ii ; Trans. Berw. Nat. Club, ii. 
Character . — Nearly spherical in shape. Beak very 
long and sharp, curved downwards almost into the shape 
of a crescent. Inferior antennae very short. 
