GAMMARIDEA. 935 



Bay of Islands, New Zealand ; in small pools on the roeky shores 

 near Cororatika. Collected in March, 1840. 



Length, two lines. Colour, greenish. Males and females were 

 found in contact. Eye nearly round. Flagellum of the superior 

 antennae with oblong slender joints, and each has two or three short 

 setae at apex, about as long as width of joint, and appressed to the 

 joint. The third and fourth joints of base of inferior pair are sub- 

 equal. The joints of the flagellum are not as long as in the other 

 pair ; the setae are about as long as width of joints. In the females, 

 the antennae are a little shorter than in the figure (which represents 

 a male), and the setae are not as long. 



The hand of the second pair has one or two minute setae at apex, and 

 a few others similar on the palm. The finger when shut leaves a 

 small space between it and the hand. These hands have their back 

 toward the observer in a side view of the animal (fig. 7 a), and only 

 when detached is it possible to have the direct side view in figure g. 



The caudal stylets are slender, and naked, except under a high mag- 

 nifying power, when a few very minute setae are distinguished. The 

 posterior pair is somewhat elongate, and all the stylets extend back 

 about the same distance. The third pair is about half as long as the 

 first, and the two branches are subulate. The body is naked. 



Genus AMPHITHOE (Leach), Dana. 



Epimerce magnce, 5tce 4:tis no?i breviores, hilobatce, lobo posteriore minimo 

 vel fere obsolete*. Styli caudales postici biramei, ramis perbrevibus, 

 uno (externa) scepe subeonico, apice bi-unguiculato, unguibus recurvatis, 

 dltero lamellato, apice swpius paulo ciliato et non spinuloso. 



Epimerals large, those of fifth segment not shorter than those of 

 fourth, two-lobed, posterior lobe very small or nearly obsolete. 

 Caudal stylets of posterior pair two-branched ; branches very short, 

 the outer often subcorneal, and at apex bi-unguiculate, claws re- 

 curved, other branch small lamellar, usually ciliate at extremity 

 and not spinulous. 



The epimerals in the true Amphithoe are large, the fifth the largest, 



