I. 21. 16 



pigmented and is deeply but narrowly emarginate above. The 

 ophthalmic scales are rather blunt and bear fringes of setae. 



The antennular peduncle is long and slender. The first 

 joint is short ; the second does not reach the distal end of the 

 eyes ; the third, which is the longest, reaches practically as far 

 as the tip of the antennal peduncle. 



The first joint of the latter is short and broad. The second 

 is produced into a long massive spine on the outer side and 

 bears a small tooth on the inner. From a point between these 

 two springs the acicle or antennal scale, which is long and 

 slender. It is more or less triangular in cross section and ends 

 in a sharp point. It bears several groups of stiff bristles on 

 its upper surface and reaches the distal third of the fifth ped- 

 uncular joint. The third joint is most easily seen from the 

 under-side as it is hidden above by the second and fourth 

 joints. It bears a small spine at its distal end. The fourth 

 joint is stout and cylindrical ; the fifth is the longest of the series 

 and is compressed. The flagellum is more than twice as long 

 as the carapace. 



The mandibles are large and massive, the cutting edge 

 being produced into a central prominence without teeth. 

 There is a three- jointed palp. The two endites of the first 

 maxillae bear fringes of setae on their inner edge, and the 

 anterior one has also a row of sharp teeth. The palp ends in 

 two small lobes, one of which bears three or four stout bristles, 

 while the other curves backwards. 



The scaphognathite of the second maxillae is abruptly trun- 

 cated at its posterior end. 



The exopodite of the first maxillipedes is triangular in shape 

 and bears a flagellum. 



The second and third maxillipedes are pediform. The 

 flagella of the exopodites are turned inwards as in the Brachy- 

 ura. The coxae of the third maxillipedes are separated by a 

 broad sternum. There are two small teeth on the inner margin 

 of the merus. The linea cristata of the ischium bears about a 

 dozen large teeth. 



The chelipeds are very unequally developed, that on the 

 right being very much larger and more massive than the left. 

 In the right cheliped the fingers move in an almost horizontal 

 plane. The three basal joints are very short and comparatively 

 slender. The merus is much broader than the preceding 

 joint and is more or less twisted. It is roughly triangular in 

 cross section, the upper part being narrowed to a ridge and 

 the sides and lower surface flattened. It bears a few tubercles 

 and scales above and below, but the sides are almost smooth. 

 The carpus is of practically the same length as the merus and 

 is slightly thicker. In cross section it is roughly quadrangular 

 and is broader than deep. Its upper surface is covered wdth 

 large and small tubercles which aremoderately sharp. Along 

 the inner margin of the upper surface there is a row of larger 

 tubercles which increase in size anteriorly. The propodite is 



