280 



THETIS SCIENTIFIC RESULTS. 



iiropods are all greatly produced ; the whole combined forms a 



symmetrical oval, with a thin 

 subcontinuous and densely cili- 

 ated border. 



The general appearance of 

 the body is somewhat similar 

 to that of a small chiton. 



The cephalon is slightly con- 

 vex centrally, and about two- 

 thirds broader than long. The 

 frontal region exhibits a quad- 

 rate median process ; the sub- 

 median border is sinuate ; the 

 antero-external border is evenly 

 curved, and terminates at the 

 pointed extremities of the epi- 

 mera-like sides of the head. 



First segment of the peraeon 

 is short in the middle line, but 

 long at the sides ; the second to 

 the seventh segments are sub- 

 equal in length. Pleon as long 

 as the six preceding segments 

 combined. The penultimate 

 segment exhibits on each side 

 a pair of well-defined side 

 plates. The terminal segment 



is mesially convex, with the antero-lateral angles acute, the sides 



converging, and the posterior 



border rounded. 



The whole of the epimeral 



processes are more or less 



obliquely truncated. 



Eyes dorsal, subreniform, the 



posterior third deeply imbedded 



in anterior margin of the first 



peraeon segment. 



The first antennae have the first 



two joints greatly dilated, and 



pi'oject beyond the frontal mar- 

 gin. The anterior boi'ders are 



.strongly ciliated ; the third joint 



is minute, and terminates in a 



very short flagellum with six 



articulations. 



Peduncle of superior antennae 



compressed, but not dilated ; the 



first two joints are short, thirfl 



joint widening to theapex ; fourth 



Body viewed from above. 

 Fig. 38a. 



First and Second Ante.nn.e. 

 Fig. -ASb. 



