CE.TJSTACEA Or THE MEEGUI ARCHIPELAGO. 41 



than the large rounded internal lobe of the infraorbital margin, 

 which even extends a little more forward than the third frontal 

 teeth, though less than the second. The external angle of the 

 upper orbital margin is small and less prominent than the external 

 angle of the under margin, from which it is separated by a small 

 hiatus. The internal infraorbital lobe is united in this species 

 with, the obtuse internal angle of the upper margin, so that the 

 orbits are perfectly closed internally, a character which even 

 distinguishes the genus Myomenippe. This character is already 

 present in the youngest specimen, which is only 22 millim. 

 broad. According to Hilgendorf, the orbits of young spe- 

 cimens of Myomenippe Fornasinii, 12 millim. broad, are also 

 already closed internally, precisely as in the adult. The 

 lateral margins of the cephalothorax are armed with four teeth, 

 besides the small external orbital angle ; these teeth are sepa- 

 rated from one another by rather deep incisions, and their 

 margins are minutely granulated. The first is triangular and 

 acute, and its external margin is slightly emarginate. The 

 second, the largest of all, is almost twice as long as the first, 

 and its external margin is nearly straight. The third and 

 fourth teeth are more acute than the two preceding; the third 

 tooth is shorter than the second, but a little longer than the 

 first, and it is directed straightly forwards, the external margins 

 of both third teeth scarcely converging backwards. The fourth 

 or last antero -lateral tooth is directed obliquely outwards and 

 forwards. 



The chelipedes of the male are a little unequal, the right 

 being the larger in all these specimens. The arpis project 

 scarcely beyond the lateral margins of the cephalothorax. The 

 upper margin of the arms terminates quite at the distal end 

 in a small acute spine, which may easily be overlooked. The 

 wrist presents an acute, prominent, dentiform, internal angle 

 slightly curved upwards ; the upper surface of the wrist is 

 granular anteriorly outwards and along the inner margin, the 

 gramiles being less distinct on the middle of the upper surface ; 

 in the younger specimens the whole upper surface is more or 

 less granular. In the adult male the length of the larger hand 

 measures nearly three fourths of the breadth of the cephalo- 

 thorax ; the hand is quite smooth on its outer and inner surfaces, 

 and also on its under margin, but it is granular on and near the 

 rounded upper margin, and some granules are also observed on 



