DUTCH BORNEO-EXPEDITION. 69 



branchial teeth appears a little shorter than the dis- 

 tance between the tip of the first epibranchial tooth and 

 the outer angle of the orbits. I presume that these both 

 characters coincide. 



Von Martens (1. c.) says that in his specimens from 

 Borneo the extra-orbital tooth presented a »zwar abgerun- 

 deten und stumpfen , aber doch deutlich begrenzten Vor- 

 sprung", that he considered as homologous to the first 

 epibranchial tooth of Parathelphusa sinensis. In the spe- 

 cimens now lying before me no trace of such a promi- 

 nence is perceptible. 



According to the same author the penultimate segment 

 of the male abdomen should be about once and a half 

 as long as broad, but in the present specimens it is but 

 slightly longer than broad. In the older specimens 

 the lateral margins of that segment show a small blunt 

 prominence (Fig. 3), so that it appears here broadest; 

 behind these prominences the lateral margins run parallel 

 with one another. In the largest male, that from Mount 

 Kenepai, the penultimate segment (Fig. 3) appears at the 

 two prominences only for one ninth part, and behind them 

 for one sixth less broad than it is long. 



In two specimens without definite locality, viz. in the 

 male specimen N° 4, measured below, and in a female, 

 the ambulatory legs are a little more slender as is 

 ordinarily the case : this species therefore varies also in 

 this character. 



Cephalothorax and legs of most specimens have a dark 

 olive-green colour, sometimes with a reddish hue, as espe- 

 cially in the female from Sanggau ; the fingers are darker, 

 often blackish with reddish yellow tips. 



Measurements in millimeters: 



12 3 4 5 6 7 8. 



c/ -9 9 d" -9 d" c/ -9 

 Greatest width at the tips of the last 



epibranchial teeth 48^- 46 39^ 42 39-^ 33 24^ 32 



Length of the carapace, the abdomen 



excluded 38 37 32 33 31i. 26 19 26 



Notes from the Leyden IMuseum, Vol. XX-I. 



