DEX AMINE. 
177 
pendage. Telson simple. First jaw-foot simple ; second 
subcheliform. 
Iphimedla obesa, Rathke. (Plate X. fig. 6.) — Head 
produced into a beak ; upper antenna as long as the lower ; 
the dorsal ridge of the segments, from the seventh to the 
tenth, with two parallel spines. 
Tenby (Mr. Webster) ; Macduff (Mr. Gregor) ; Ply- 
mouth (Mr. Spence Bate). 
Gen. 75. ACANTHONOTUS, Owen. 
First jaw-foot subcheliform. Telson divided ; mandible 
palpigerous. 
Acanthonotus testudo. — Head armed with a beak ; 
the eighth to the eleventh segments produced behind into a 
strong spine; the hind margins also denticulated on the 
sides; anterior coxae produced each to a point, the fifth 
directed posteriorly. 
Banff (Mr. Edwards) ; Macduff (Mr. Gregor). 

I Gen. 76. DEX AMINE, Leach. 
Four front legs nearly equal, with one finger, armed with 
a compressed, filiform, subovate hand. Antennae with the 
' N 
1 
