ANOMALOCERA. 301 



domen each of five segments ; antennules composed of two 

 branches. 



Diaptomus castor, Jurine, sp. (Plate XYII. fig. 4.) — Of 

 a transparent hue, delicate red, sometimes blue; antennse 

 long and strong, of about twenty-six joints. 



Hab. In ponds and slow-running water. 



M. Jurine has named the species Castor, or the beaver, 

 from a fancied resemblance he saw in the abdomen of the 

 female, when loaded with eggs, to the tail of a beaver. 



Gen. 165. TEMORA, Baird. 



Head joined to first segment of the thorax; thorax of 

 five, abdomen of three, segments ; antennules two-branched ; 

 five pairs of legs, the first four with a branch of two joints. 



Temora Einmarchica, Gunner, sp. — Body dark-brown 

 (in spirits) ; antennae very long, of twenty-four joints. 



Hab. Coast of Ireland. 



Gen. 166. ANOMALOCERA,* Templeton. 

 Head distinguishable from body, with a beak divided at 



* From av&yzaAos, dissimilar, and icepas, a horn. 



