CAPRELLIDEA. 397 



Fam. II. Cyamid^e. — Corpus late depressum. Antennae 2daB rudi- 

 mentariae. [Species parasitica}.] 



The Caprellidse cling by their six hinder legs to sea-weeds, coral- 

 lines, and other objects of support, while the long body moves in 

 various directions, and wields its well-handed anterior legs for taking 

 its prey. The Cyamidae, on the contrary, are found attached like 

 the Cymothoidae, to the body of marine animals. 



The genera in these families, thus far recognised, are as follows : — 



Fam. I. CAPRELLIDJE. 

 1. Pedes thoracis numero 14. 



G. 1. Proto,* Leach. — Mandibulae palpigerae. Branchiae segmentis 2do 3tio 4to- 



que affixae. Pedes thoracis toti articulis normales. 

 G. 2. Protella, Dana. — Mandibulae palpigerae. Branchiae segmentis 3tio 4toque 



affixse. Pedes 3tii 4tique obsoleti articulo lmo styliformi excepto. 



2. Pedes thoracis Ztii ktique omnino obsoleti. 



G. 3. Caprella, Lamh. — Mandibulae non palpigerae. Branchiae segmentis tho- 

 racis 3tio 4toque affixae. Abdomen brevissimum, 1-2-articulatum. 



G. 4. iEaiNA, Krbyer.-\ — Mandibulae palpigerae, palpis 3-articulatis. Branchiae ac 

 in Caprelld. Abdomen brevissimum, 1-2-articulatum. 



G. 5. Cercops, Rrdyer.% — Mandibulae palpigerae. Branchiae segmentis 2do 3tio 

 4toque affixae. Abdomen 5-articulatum, appendicibus 4 elongatis 3-articulatis. 



3. Pedes 3tii 4:ti 5tique obsoleti. 

 G. 6. Podalirius, Krdyer.% — Branchiae segmentis 3tio 4toque affixae. 



Fam. II. CYAMIDiE. 



G. 1. Ctamus. 



* Leptomera, Latreille. f Tids., iv. 1842. t Ibid - 



§ Voy. Scand., pi. 25, and Tids. [2], i. 283. 



