are pronouncedly prehensile, terminating in a more or less powerful, clawed hand. 

 The latter section may again be conveniently divided into 2 subsections, according 

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

 pleopoda, these legs are of a structure similar to that of the succeeding pairs 

 and, like them, natatory; in the other sub-section, Chirognatha dactylopoda, they 

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

 into grasping organs. 



Section I. Achirota. 



Remarks. 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 

 several well-defined genera. The chief characters common to all of them is the 

 non-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 

 probable 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. Misophriidee. 



Characters. Body cydopoid 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 antennae in male, as usual, prehensile. Posterior antennae and oral parts 

 of a structure rather similar to that in the Calanoida. Natatory legs more 

 cydopoid in shape, and rather powerful, with both rami triarticulate. Last pair 

 of legs 3-articulate, and of same appearance in both sexes. Ovisac single, ventral. 

 A heart present, as in the Calanoida. Male genital apparatus symmetrical, 

 like that in the other Harpacticoida. 



Remarks. This family, established by Prof. Brady, has generally been 

 placed between the Calanoida and Cyclopoida, being 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 Harpacticoid group, 



