Tribe 3. 



CAPRELLIDEA, 



Body sometimes slender, cylindrical, sometimes short and broad, depres- 

 sed. Ceplialon more or less completely coalesced with the 1st segment of meso. 

 some. Metasome and urosome rudimentary. Superior antennae more or less 

 slender, and without any accessory appendage; inferior antennae much smaller 

 than the superior. Oral parts now normally developed, now very small and 

 densely crowded together beneath the anterior part of the cephalon. Gnatho- 

 poda generally very unequal, the posterior ones being much the larger. 

 Anterior pairs of pereiopoda most frequently wanting; the posterior pairs 

 strong, prehensile. Branchial lamellae, as a rule, only present on the 3rd and 

 4th segments of mesosome; of incubatory lamellae never more than 2 pairs, 

 issuing from beneath the said segments. Pleopoda wanting; uropoda either 

 rudimentary or obsolete. 



Remarks This is the last tribe of Amphipoda, comprising the 



lowest members of the order, and corresponding to the Lcemodipoda of 

 earlier authors. In their outward appearance, the forms belonging to this 

 tribe vary considerably from the Amphipodous type, as revealed in the 

 Gammaridce, being either extremely narrow and cylindric, or broad and depressed. 

 In both cases they are very distinct owing to the rudimentary condition of the 

 2 posterior divisions of the body (metasome and urosome). The tribe comprises 

 '2 distinct families, viz., the Gaprellidce and the CyamidcB, the first of which 

 exhibits some points of agreement with the last family of the Gammaridea, the 

 Didicliiidce. 



Fam. 1. Caprellidae. 



Body narrow, cylindric, and very flexible, with the 1st segment of 

 mesosome generally defined from the cephalon by a slight dorsal depression, 

 3rd and 4th segments in female much broader than in, male, and carrying the 



