an- pronouncedly prehensile, terminating in a more IT less powerful, clawed hand. 

 Tlic latter section may au r ain be conveniently divided into ~2 subsections, according 

 to the structure of the 1st pair of le.ns. In the one subsection, Chirognatha 



!>/, ,,/,,, <l,i. these legs are of a structure similar to that of the succeeding pairs 

 and. like them, natatory: in the other sub-section. (.'liii-"<intitli<i 'I'li-h/lnjuJii. they 

 an- rather unlike the succeeding pairs, and more or less distinctly transformed 

 into grasping organs. 



Section I. Aehirota. 



/.'. nun-Is*. This section is far less extensive than the next. It com- 

 prises. however, as yet, 4 different families, each of which, except the 1st, contains 

 se\eral well-defined genera. The chief characters common to all of them is the 

 m>n-prehensile structure of both the posterior maxillipeds and the 1st pair of 

 legs. In the latter character they agree with those belonging to the 1st sub- 

 division of the next section. 



The greater number of species are true deep-water forms, and it is very 

 pr<>hable therefore, that on a future closer examination of deep-water deposits, 

 several additional forms will be detected, requiring perhaps the establishment of 

 both new genera and new families. 



Fam. 1. Misophriidae. 



Characters. -Body (///In/nut! in shape, the posterior division (including 

 the last segment of metasome) being abruptly much narrower than the anterior. 

 Anterior antennae unusually prolonged, and consisting of numerous articulations; 

 both antenme in male, as usual, prehensile. Posterior antenna' and oral parts 

 of a structure rather similar to that in the ('nl<inniil<i. Natatory legs more 

 i-i/rlnfioiil in shape, and rather powerful, with both mini lri:irticulate. Last pair 

 of h-^s 3-articulate, and of same appearance in both sexes, < hisae single, ventral. 

 A heart present, as in the ('iiluiinnln. Male genital apparatus symmetrical, 

 like that in the other //iirjitx-tirtiitla. 



//<//"///>. -This family, established by Prof. Brady, has generally been 

 placi-d between the Ciiltiiiniiln and Ci/cln/,i,iiln. hein.i,' regarded by some authors 

 as more nearly related to the former group, by others as nearer to the latter. 

 In my opinion, it ought more properly to be included in the Ilnr[i/iclifnnl group, 



