CRUSTACEA OF THE MEEGUI ARCHIPELAGO. 209 



punctated, when exam ined under a strong leas. The protogastric 

 lobes are quite indistinct. 



The front is strongly deflexed and tridentate (the supraocular 

 teeth not being included). The median tooth is very small, 

 subacute, and being directed perpendicularly downward is 

 only partly visible when the carapace is viewed from above. 

 The lateral teeth are conical, subacute, much larger than the 

 median tooth, and directed forwards and slightly outwards. The 

 internal angle of the upper orbital margin (supraocular tooth, 

 Miers), which is rounded and obtuse in D. caput-mortuum, is 

 rather acute in this species, and its distance from the lateral 

 frontal tooth is quite as great as the distance between the 

 two lateral frontal teeth. The external orbital angle is obtuse 

 and scarcely prominent, and is separated by a narrow hiatus 

 from the inferior margin of the orbits, the lobe of which 

 is triangular and acute ; the inferior orbital lobe of D. caput- 

 mortuum is, on the contrary, very obtuse. The acute internal 

 angle of the upper orbital margin is as far distant from the 

 lateral frontal tooth as from the obtuse, external, orbital angle. 

 The external antennae are a little more than half as long as the 

 cephalothorax. 



The autero-lateral margins are as much longer than the 

 posterolateral as in D. caput-mortuum ; they are armed, behind the 

 external orbital angle, with four small acute teeth of nearly 

 equal size. The first antero-lateral tooth is as far distant from the 

 obtuse, little prominent, external orbital angle as the latter is 

 from the internal angle of the upper orbital margin ; the second 

 tooth is a little smaller than the first, and its distance from the 

 first is a little less than the distance of the first tooth from the 

 external orbital angle. The third tooth, which is, again, as promi- 

 nent as the first, is as far distant from the second as the second 

 is from the first * ; the distance of the fourth tooth from the third 

 is almost twice as great as the distance between the third and the 

 second, and the second tooth is as far distant from the fourth as the 

 fourth is from the cervical suture. The fourth tooth is as promi- 

 nent as the first and the third. A rather acute tooth, in which 

 the slightly convex postero-lateral margin terminates, occurs 



* In the small specimen, the cephalothorax of which is only 16 millim. 

 long, the second antero-lateral tooth is situated closer to the fii-st than to the 

 third. 



LINK. JOUBN. — ZOOLOGT, VOL. XXII. 14 



