1926] « Schmitt, Crustaceans Collected by the Congo Expedition 17 
dorsal teeth, and 13 having 22 or more dorsal teeth; the ventral range 
takes in all but 8 of our Stanleyville specimens, four having less than five 
teeth and four more than twelve teeth. Neither the shortness of the 
rostrum nor the variability of thé tooth-free portion of the rostrum is a 
distinguishing character for this supposed variety. Nearly three-fifths 
(seventy-eight) of the examined Stanleyville specimens have the rostrum 
ranging from a little longer, to one-half the length of the last segment 
shorter, than the antennular peduncle. ; 
With respect to the number of dorsal rostral teeth situated on the 
carapace, unless this point were carefully considered and an accurate 
count made; the number might well have been rated too low in the rostral 
formula of the several described varietal forms here discussed. For 
typical togoensis, Hilgendorf gives 2 or 3, and for his variety stuhlmanni 
2-3 (rarely 4), Bouvier has but 3 for decorsez and Lenz 3-4. ‘Two teeth 
on the carapace seem to be of rather rare occurrence; only in eleven of 
153 specimens was this found to be the case; sixty-six specimens had 3, 
forty-seven had 4, twenty-eight 5, and just one was found which had as 
many as 6 dorsal rostral teeth on the carapace. 
So far as I have been able to ascertain, there is no correlation between 
the number of dorsal or ventral rostral teeth, teeth on the carapace, 
uropodial spines, spinules on the dactyls of the fifth pair of legs, and sex. 
