CYCLOPOIDEA. 1039 



palpiform appendage, of considerable size, which is furnished with 

 setae; the mandibular palpi (or, more properly, the pediform termi- 

 nation of the mandibular organ) extend laterally in such species like 

 a pair of short legs. Moreover, the feet of the first pair never take 

 the form of a monodactyle hand. These are the Calanid^e. 



The remainder have the mandibular palpi small with few setae, 

 or obsolete, and the feet of the first pair often terminate in a mono- 

 dactyle hand, or are in some way prehensile at the extremity. 

 These species, may, as in the ordinary Cyclops, have only a single 

 minute eye of two lenses, or there may be also a second pair consisting 

 of a large prolate lens with a very broad oblate cornea in the shell, as 

 in Sapphirina. Those' of the former kind are the Cyclopia, and 

 those of the latter kind, the Cokycleidje. The flat or depressed, sub- 

 cylindrical, and compressed forms of body may all occur in the same 

 family, as such variations are of small importance ; and the transitions 

 are sometimes so gradual that it is difficult to divide off the depressed 

 species from the others in a group. 



The three families mentioned may be characterized as follows : — 



Fam. I. Calanim:. — Oculi duo simplices minutissimi, pigmentis sive 

 coalitis sive discretis ; interdum oculi quoque alii duo coaliti infra 

 caput deorsum spectantes. Mandibulae maxillaeque elongate palpi- 

 gerae vel instar pedum products, palpis bene setigeris. Sacculus 

 ovigerus unicus. Antennae lmae elongatae, non appendiculatae ; 

 antenna maris sive dextra sive nulla geniculans. Pedes lmi ex- 

 tremitate nunquam subprehensiles. 



Fam. II. Cyclopim:. — Oculi duo simplices minutissimi, pigmentis 

 coalitis. Mandibulae palpo parvulo vel obsoleto et parce setigero. 

 Sacculi ovigeri sive unicus sive duo. Antennae lmae saepe appendi- 

 culatae, maris sive ambae sive nullae geniculantes. Pedes lmi 

 extremitate plus minusve subprehensiles. 



Fam. III. Cobygjeidm. — Oculi duo simplices minutissimi, pigmentis 

 coalitis ; alii quoque duo portentosae magnitudinis, lenticulo prolato 

 interno, corneaque magna oblata in testam insita instructi. Sac- 

 culi ovigeri sive duo sive unicus. Antennae lmae nunquam genicu- 

 lantes. Pedes lmi extremitate saepius subprehensiles. 



We doubt somewhat as to which of these families takes precedence 



