CYMOTHOIDEA. 745 



Subtribe III. CYMOTHOIDEA. 



Excluding the Praniza and Serolis groups from the Cymothoidea, 

 this subtribe has trenchant limits. The large abdomen, having the 

 last segment broad and often scutiform, widened on either side by the 

 lamellate or falciform caudal appendages, so as to make it a powerful 

 natatory organ, give a peculiar character to the species. The five 

 anterior pairs of abdominal appendages have a general similarity of 

 form and structure, and are not divided between the third and fourth 

 pairs into two series, like the Amphipods, and the Serolis group of 

 Anisopods. The anterior pair of legs is sometimes more or less sub- 

 cheliform, but rarely the second pair, unless at the same time the fol- 

 lowing pair and others, are also subcheliform. 



The families in this subtribe are as follows: — 



Fam. I. Cymothohle.* — Maxillipedes breves, 3-4-articulati, operculi- 

 formes, articulis terminalibus angustis, brevibus. Appendices 

 caudales liberae, marginibus rarissime ciliatae. Antennae sub capite 

 infixae. Abdomen 4-6-articulatum, segmentis anterioribus raro 

 coalitis. Pedes toti ancorales. Branchiae saepissime non ciliatae. 

 Epimerae conspicuae. 



Fam. II. JEgidm.-\ — Maxillipedes elongati, 4-6-articulati, articulis 

 totis lamellatis, terminalibus latis et brevibus. Appendices caudales 

 liberae, marginibus ciliatae. Antennae ad frontis marginem capitis 

 amxae, apertae. Abdomen 4-6-articulatum. Pedes 6 antici inter- 

 dum ancorales aut prehensiles, saepe simpliciter unguiculati, 8 pos- 

 tici unguiculati et nunquam ancorales. Branchiae ciliatae. Epi- 

 merae conspicuae. 



Fam. III. Spheromdle. — Maxillipedes elongati, 5-6-articulati et palpi- 



* Cymothoadiens Parasites, Edwards, Crust., iii., 228, 247. 

 •f Cymothoadiens Errans, Edwards ; ibid., 228, 233. 



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