26 Bulletin American Museum of Natural History [Vol. LIII 
flagellum, and by the measurements of the legs of the second pair. Of 
the rostrum of L. [Palemon] maculatus the distal, toothless part of the 
upper margin is longer, only one tooth is situated on the carapace behind 
the orbit, the second being placed above the orbital margin, and the 
lower margin is always tridentate; in L. [Palemon] longirostris and the 
variety robusta constantly two teeth are situated on the carapace and the 
lower margin of the rostrum carries 3, 4, or 5 teeth. The shorter ramus 
of the outer antennular flagellum is fused to the longer for half or a little 
more than half its length, being coalesced until to the middle or to just 
~ Z thy 
Reed 
Fig. 65. Palemon maculatus (Thallwitz). 
Lateral view, X about 214 (after Balss). 
beyond the middle, that of L. [Palemon|] longirostris only for one-third 
of its length. The carpus, finally, of the second pair of legs is constantly 
a little more than one and a half as long as the chela, whereas in L. 
[Palemon|] longirostris carpus and chela are of equal or subequal length.”’ 
Exceptionally the rostrum may be scarcely a little longer than the 
antennal scale, but usually it extends one-third or one-fourth its length 
beyond. Above there are from 7 to 10 teeth, below from 2 to 5; very 
few specimens have as many as 10 dorsal teeth, and I have seen but two 
specimens with 2 ventral teeth, eighteen with 4, one with 5. The usual 
number of teeth on the lower margin of the rostrum is 3; of the dorsal 
