84 REPORT OF X'EW JERSEY STATE MUSEUM. 



The male can still move about somewhat, but the female has lost 

 all trace of every appendage except those which serve to fasten 

 her to her host. 



Key to the families. 



a. Mouth suctorial, without or only with rudimentary foot- jaws. 



b. External ovaries as dilated sacs. LERn^opodid.^ 



bb. External ovaries filiform. lErn.^id.^ 



aa. Mouth siphonal, with styHform mandibles and well-developed foot-jaws. 



c. Head formed as a buckler, furnished anteriorly with frontal 



plates ; short antennae consist of two flattened points ; thoracic 



segments uncovered, or series of one or more pairs of elytraform 



lamellar appendages on dorsal surface. caligid^ 



cc. Head not formed as a buckler or shield-shaped, and not furnished 



anteriorly with frontal plates ; antennas long, of five or more 



articulations ; body oyoid or pyriform. 



d. Antennae of five or six articulations ; parasitic. Ergasilid.^ 



dd. Antennas of six to eighteen articulations ; free-swimming. 



CYCLOPID^ 



Family LERN^OPODID.^. 



Adult female. — Body robust, incompletely or not seg- 

 mented at all. First antennae small, arise from inside posterior, 

 which latter usually biramous. Mouth conic, margin ciliated 

 and dentate slender mandible seen within. Maxillae curved, 

 toothed, free. First maxillipeds large, developed as strong hook- 

 like limbs. Second maxillipeds converted into organs for 

 attachment, sometimes long and slender, at others united 

 throughout, or short and dilated, ending in fixed apparatus. 

 Thoracic limbs often entirely absent. External ovaries as dilated 

 sacs. Habit that of a fixed parasite. 



Male. — Pigmy in form. Found clinging or attached to some 

 part of the female, as the head, arms or body. While strikingly 

 different, it is also proportionately very small. The articulated 

 limbs often represented, but varying in the different genera, are 

 of value in the arrangement of the groups. 



A single genus in our limits. 



