AXOMALOCERA. 229 



well developed, and, as well as the three paii'S of foot-jaws 

 (f. 1 c, d, e), exactly resemble those of Diaptomus. 



The four anterior pairs of feet (f. 1 j/) are all alike, 

 and consist of a basal stalk of two articulations, and two 

 branches of unequal size. The inner branch is much 

 the smaller, but both are divided into two joints. The 

 posterior or fifth pair is almost exactly similar to the 

 corresponding pair in Diaptomus. 



I have never found this species alive, having only seen 

 it preserved in spirits. 



Hab. — Coast of Ireland, W. Thompson, Esq. 



Genus 3 — Anomalocera.* 



Anomalocera, Templetou, Traus. Eiit. Soc, ii, 35, 1837. 

 Iren^us, Goodsh; Ediu. New Phil. Joum., xxxv, 339, 18-i3. 

 PoNTiA, Baird, Traus. Berw. Nat, Club, ii, 15G. 



Cliaracfer. — Head distinguishable from body; furnished 

 with a beak, which is divided at apex into two sharp 

 points, and at the base terminates on either side in a sharp 

 liooked spine. Thorax divided into six, abdomen into 

 four segments. Antennules not two-branched. Foot- 

 jaws strongly developed. Eye in male pedunculated. 



1. Anomalocera Patersonii. Tab. XXVII, figs. 1 a-i; 



2 a-c. 



Anomalocera Patersonii, Templeton, Trans. Ent. Soc, ii, 35, t. 5, 



f. 1-3. 

 PoNTiA Patersonii, Balrd, Trans. Bervv. Nat. Club, ii, 156. 

 IrenjEUS splendidus, Goodslr, Edin. New Phil. Journ., xxxv, 339, 

 t. 6, f. 12-17, t. 4, f. 1-9. 



Description. — The head is distinguishable from the 

 body, but firmly articulated Avith the first segment of the 

 thorax. It is of a sub-triangular shape, with a curved, 



* From ai'oi^iaXor, dissiiuilur ; and Ktpai-^ a horn. 



