62 CARCINOLOGICAL STUDIES. 



and diviiled by a triangular notch in two lobes which 

 are directed somewhat obliquely backward. The margins 

 of the frontal lobes are nearly straight, scarcely a little 

 sinuous , and are not separated by any incision from the 

 obtuse internal orbital angles. The frontal margins are 

 smooth and not granular, quite as the upper surface of 

 the cephalothorax. The orbits are large and slightly broader 

 than half the width of the front. The eye-peduncles are hairy. 



The upper margin of the orbits is not granulate , but 

 hairy; the external angle is formed by a triangular, acute 

 and rather prominent tooth , close to which the upper margin 

 presents still a much smaller, triangular lobe. The acute 

 tooth at the extraorbital angle is separated by a deep, 

 triangular hiatus from the lower margin of the orbits ; this 

 hiatus is a little broader in the female than in the male. 



The external half of the inferior margin of the orbits is 

 entire , the internal angle dentiform , acute , hairy and 

 rather prominent (fig. 4a) and two or three much smaller 

 teeth are observed between the internal tooth and the 

 external half of the lower margin. The interior hiatus of 

 the orbits is rather wide and spacious; the basal joint 

 of the autenual peduncle is considerably shorter than the 

 internal suborbital tooth and does by far not reach the 

 front. The second joint reaches to the upper surface of 

 the front and the third joint is almost as long as the 

 second. The flagellura is glabrous and as long as the 

 breadth of the front. 



The antero-lateral margins are distinctly shorter than 

 the postero-lateral. They are armed with three very 

 acute spiniform teeth, which are equally distant from 

 one another as from the dentiform external orbital angle. 

 The subhepatic region bears several small and acute tuber- 

 cles, one of which is larger than the others and dentiform 

 (fig. 4a). The pterygostomian regions are somewhat granular. 

 The endostome is distinctly ridged. The merus-joint of the 

 outer foot-jaws is quadrangular, its anterior margin straight 

 or scarcely concave and the external angle obtusely rounded. 



Notes from the Leyden Museum, Vol. XII. 



