72 BRITISH OOPEPODA. 



Genus 11. Pontella, Dana (1849). 



(Pontia, Milne-Edwards.) 



Head distinct from thorax ; fourth and fifth tho- 

 racic segments coalescent. Abdomen of the male 5-, 

 of the female (2- ?) or 3-jointed. Anterior antennas 

 23- or 24-jointed ; the sixth and seventh joints 

 coalescent or distinct ; the right antenna of the male 

 greatly swollen in the middle from the thirteenth to 

 the sixteenth, and hinged between the nineteenth and 

 twentieth joints; the seventeenth, eighteenth, and nine- 

 teenth united into one long joint, which is toothed on 

 the inner margin ; the twentieth and twenty-first 

 joints also coalescent and toothed. Posterior antenna 

 having a well-developed secondary branch. Maxilla 

 (PI. 10a, fig. 6), well developed, composed of a 

 broad prehensile portion, with a large 3- or 4-lobed 

 branchial palp. Mandible-palp 2-branched, of mode- 

 rate size. Basal portion of the posterior foot- jaw 

 produced into three setiferous digits, apical portion 

 4-jointed, elongated. Inner branches of all the 

 swimming feet 2- jointed. Fifth pair of feet on the 

 right side only in the male, forming a powerful clasp- 

 ing organ, that of the left side much less strongly 

 developed. 



