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lliat tin.- tines of the i"ornici- arc iiifciior in development U> those of the latter. 



Tile on]\- externally ncAiceable distinc- 

 tion Ijctuecn the t\\>) tyi>cs is found 

 in the caput wliicli in the low type, 

 is truncated on both sides of its hind 

 part, while in the high type this part 

 is not truncated. 



TakiML; the same unit of mea- 

 surement as in Claiiogiiathus, the total 

 320 male sjKcimcns whose body length 

 I iiteasured may be arranijed in 23 

 calsses (Table 3)- 



1 il;. 5 Lsuaiiiis macuHfemoratus, Motsch. Photo 

 of representative.s of two extreme variations. 

 a, l.irgest 50 mm ; /', smallest 28mm indivi- 

 dual. (Natural size). 



Tabic 



From this table we notice, in the first place, that the present species is 

 larger than the male of Cladognathus in both the high and low types ; in 

 the second place, the \'ariation passes abruptly from one unit to the next 

 one; c<^nse<[uently there are, thirdl\-, 23 classes as in C'adognathus, those at 

 and near the extremities being represented by only a few individuals (see 

 Table i); and la.stl,\', the numbers of each class are at first irregular in in- 

 creasing and decreasing. The individuals shows a sudden increase in number 

 from the 43mm class to the 44iTim class ; thereafter a stead}' decline takes 



