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The cephalo-thoracic segment is furnished with two sty- 

 liform appendages (t. XXIX, f. 1 a), instead of having 

 the moveable beak of Anomalocera ; these very much re- 

 semble antennae in appearance, and are described as such 

 by Goodsir.* 



The antennae are very long and slender, being longer 

 than the body of the animal, and composed of twenty-four 

 articulations, the twenty-second and twenty-third are 

 each provided with a long seta, pointed downwards and 

 inwards. 



The antennules (f. 1 c] consist of two branches, arising 

 from a common footstalk, and are of nearly equal 

 length. The one is divided into two articulations, the 

 first of which is the longest, and is furnished with a long- 

 seta at its extremity, the second having its extremity 

 armed with a number of very long seta'; the other consists 

 of two articulations also, the first, of which is considerably 

 bent, flattened, and armed with eight long spines on its 

 inner edge ; the second much shorter, and having two 

 long setae on its inner edge, and three from the extremity. 

 The eyes are two in number, but are exceedingly small. 



The mandibles (f. 1 b] consist, as in Anomalocera, 

 of a strong plate, having a good many teeth on its inner 

 extremity, the most external one being strong, and 

 slightly curved ; and a palpiforin branch arising from its 

 upper surface, which is composed of two brandies, rising 

 from a common footstalk, one branch being divided into 

 two articulations, and the other having only one. 



The first pair of foot-jaws (f. 1 d) resembles much 

 the same organs in Anomalocera, consisting of a basilar 

 joint, not so heart-shaped, with t\\o other articulations, 

 the last being very deeply notched, or lunate, instead 

 of being cleft to the base, but all armed witli long 

 seta-. The second (f. 1 c) is composed of two articu- 

 lations, each of which is knobbed on its inner edge, 

 and armed with twelve long, finely-plumose seta 1 , those 



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