CHYDORUS. 127 



Its motion through the water is more like rolling, as 

 Jurine describes it, than swimming. 



The mandibles, feet, and superior antenna? 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."* 



Hab. Ponds and ditches ; common almost all the 

 year round. 



2. CHYDORUS GLOBOSUS. Tab. XVI, fig. 7. 



CHYDORUS GLOBOSTJS, Baird, Aim. and Mag. Nat. Hist., ii, 90, t. 3, 



f. 14, 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 antenna large, with seven 

 teeth, and seven long seta3. Inferior antennse or rami 

 (t. XVI, f. 7 b) very short and slender ; anterior branch 

 with four seta?, one from the second, and three from the 

 last articulation ; posterior branch has only three from 

 the last joint. First 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. 



