CRUSTACKA— u Mrn:LKf;aK. 



415 



border ; they arise fmiii iicif tin- inner bonli-r of the eyes, and 

 are slightly eiirved forwai'd ; (>aeli spine l)ear.s two or three 

 spinules on the anterior border. Tiie hinder portion of the 

 cephalon is furnished with two erect and broadly conical tubercles; 

 their bases are nearly in contact in the mesial line of the body ; 

 each tubercle is tipped with a small spinule. 



The first peraeon segment bears two submedian tul;ercles, and 

 four lateral spines, two of which are seated on the epimeral 

 plates ; the spines are compressed and abruptly bent above the 

 middle, the apices being directed forward. 



The second to the fourtli segments have similar spines, but the 

 submedian tubercles are wanting. In the three remaining seg- 

 ments the armature consists of conical, spine-tipped tubercles. 

 The anterior portion of the pleon bears six sublateral tubercles ; 

 the first two pairs are erect ; the last pair are very large, and 

 directed obliquely outwards and downwards. 



The lateral surfaces of the caudal shield bear numerous com- 

 pressed spines or denticles ; five or six are .seriate, and larger 

 than the rest, three of which are lateral and the others sub- 

 marginal ; a median spine is present at a short distance from the 

 obtuse extremity. The uropods are each armed laterally with 

 four compressed denticles. 



Eyes black, round and rather pi-ominent. Inner antennae 

 equal in length to the three basal joints of the outer ; second 

 joint one-third longer than the third ; both are dilated and acute 

 or spinose at their extremities : fourth joint stout, elongate ; 

 inferior border setiferous ; the superior border 

 bears two or three denticles near the distal 

 extremity. 



Outer antennae one-sixth shorter than the 

 body; first joint short; second one-fifth shorter 

 than the third ; fourth nearly twice as long as 

 the second ; fifth half the length of the third ; 

 sixth minute. The inferior borders of the 

 second to the fourth joints are fringed with 

 long setfe ; the superior border bears ten 

 denticles ; of these three occur at equal dis- 

 tances apart on the second joint, and four are 

 seated on the fourth : the third joint also bears 

 three which are close together and confined to 

 the proximal half of the joint ; the distal den- 

 ticle is large, and often has a spinule at its 

 inner extremity. 



First pair of legs stout ; the second joint is 

 equal in length to the sixth and also to the 

 seventh ; the third joint is longer than the 

 fourth or fifth ; the latter are equal, about as 

 long as broad, and distally dilated ; the fifth 



Second antennae. 

 Fig. 118a. 



