CHYD0RUS. 127 
Its motion through the water is more like rolling, as 
Jurine describes it, than swimming. 
The mandibles, feet, and superior antennae are very 
similar to those of the preceding genus. 
According to Pritchard, “ the young play near their 
parent, and at the approach of danger swim for protection, 
within the shell of the mother, which she, conscious of 
their feebleness, immediately closes/ 7 * 
Hab .— Ponds and ditches ; common almost all the 
year round. __ . 
2. Chydorus globosus. Tab. XVI, fig. 7. 
Chydokus globosus, Baird, Ann. and Mag. Nat. Hist., ii, 90, t. 3, 
f.1-4, 1843; Trans. Berw. Nat. Club, ii, 150. 
Shell quite globular, a good deal resembling in form 
the preceding species, but more completely rounded, and 
nearly six times larger; striated circularly on exterior 
and upper margin, and spotted with small black spots • 
the anterior portion of the shell is of a red hue, with a 
large, irregular-shaped, dark band running across the 
centre of the shell, and occupying about half its extent. 
The beak is extremely long, and at times appears to lie 
close to the body. 
Abdomen (t. XVI, f. 7 c ) elbowed at the joint, and 
hollowed out immediately before it, terminating in two 
long claws. ' 
Eye large, areolar. Superior antennae large, with seven 
teeth, and seven long setae. Inferior antennae or rami 
(t. XVI, f. 7 b) very short and slender ; anterior branch 
with four setae, one from the second, and three from the 
last articulation ; posterior branch has only three from 
the last joint. Eirst pair of feet large. Intestine con- 
voluted (t. XVII, f. b), having one turn and a half. 
The motion of this species is very much like that of a 
Cypris. 
* Micros. Cab., p. 90. 
