168 U.S. NATIONAL MUSEUM BULLETIN 25 8 



Liljeborgia macrodon Schellenberg (1931) is characterized grossly 

 by the large serrations on the second articles of pereopods 3-5, the 

 non-sinuous palm of gnathopod 2 and the deep sinus on the third 

 pleonal epimeron. 



Liljeborgia octodentata Schellenberg (1931) is characterized by the 

 breadth of the poorly developed sinus of the third pleonal epimeron, 

 and the non-sinuous palm of gnathopod 2. 



Liljeborgia mixta Schellenberg (1925) has a well developed sinus on 

 the third pleonal epimeron, a distally expanded first coxa and large 

 eyes; apparently it differs from L. kinahani in the shape of article 2 

 on gnathopod 1, that in L. kinahani being most widely expanded near 

 its proximal end. 



Liljeborgiella (= Liljeborgia) longicornis Schellenberg (1931) has a 

 short claw-like dactylus on pereopod 5 (the generic character of 

 Liljeborgiella), larger teeth of pleonites 4-5 than in the other species 

 of the group, a medium-sized sinus of the third pleonal epimeron, 

 a highly distinctive gnathopod 2 with enormous, curved dactyl, and 

 a distally expanded first coxa. 



Liljeborgia geminata differs from L. kinahani by the slightly smaller 

 teeth on pleonites 4-5 and especially by their equal size on both 

 segments; in L. kinahani the tooth of pleonite 4 is much longer than 

 that of pleonite 5. Some specimens of L. geminata lack any teeth on 

 pleonites 4-5. The extent of variability in L. cota, as shown by J. L. 

 Barnard (1962b) and in manuscripts in press, indicates the unre- 

 liability of tooth formulas as specific characters. Hence these differ- 

 ences are not considered to be of sufficient degree to distinguish 

 L. geminata and L. kinahani. Coxa 1 is broader distally in L. geminata 

 than it is in L. kinahani. The articles of the antennal flagella are 

 shorter and more numerous, the eyes are much larger and more 

 irregular in outline, the sinus of the third pleonal epimeron is more 

 distinct, the posterior edges of the sixth articles of pereopods 1-2 

 have more spines, the lateral cephalic lobe is narrower and more 

 projecting, the third uropods are more spinose, coxa 4 has a broader, 

 deeper posterior excavation, article 2 of gnathopod 1 is not expanded 

 proximally, the shapes of the second articles of pereopods 3-5 differ, 

 as do their serrations, and the remaining articles of the pereopods 

 are stouter and shorter than in L. kinahani. Although these character 

 differences are minor, the combination of so many has specific value. 



In a parallel way, L. mixta Schellenberg (1925), from West Africa, 

 differs from L. kinahani by the enlarged eyes, the second article of 

 gnathopod 1, the third pleonal epimeron, and the first coxa. Because 

 other characters are not known for L. mixta there is no other way to 

 differentiate L. geminata than by these minor characters. 



