CAPRELLIDEA. 



811 



pairs of legs similar, subequal; basal joint of fourth pair shorter than 

 that of third pair; third joint in fourth pair longer than in third; fifth 

 joint with four or five short spines on the inner margin ; fourth and 

 fifth joints subequal; claw a little longer than the joint. Branchiae 

 in male, one-fourth shorter than basal joint; in female, about as long 

 as this joint. Fifth pair of legs much smaller than fourth, rather 

 more than half their length ; fourth joint about one-third the fifth ; 

 claw shorter than fifth ; no spines on inner side of fifth joint. Sixth 

 and seventh legs long, subequal ; coxa of sixth pair longest and most 

 slender; claw shorter than last joint; three or four short spines on 

 inner margin of this joint. Abdomen very short ; but there are two 

 pairs of very slender and very short appendages, and the first pair 

 terminates in a short moveable joint, which is subacute. 



The mandibles terminate in a flat dentated edge; palpus long, three- 

 jointed; first joint shortest; second longest; third a little curved and 

 acute. Palpi usually seen extending in front of the head, just below 

 the antennae. Maxillipeds six-jointed ; terminate in a stout claw, as 

 the sixth joint ; fifth joint shorter than the claw ; first joint prolonged 

 and enlarged on inner side; second prolonged at inner apex, and 

 extremity finely denticulated. Lower lip obtusely emarginate with 

 membranous suboval appendages on either side. 



The female in most respects resembles the male. The second pair 

 of feet is attached, in males, to the middle of the second segment, and 

 in females, just forward of middle. 



Genus PROTELLA, Dana. 



tegmenta tJwracis tertium quartumque branchias et pedes ruclimentarioa 

 uni-articulatos gerentia. Pedes sex ultimi subcequi. Mandibulce pal- 

 pigerce. 



Third and fourth thoracic segments bearing branchiae and rudimen- 

 tary one-jointed feet. Feet of last three pairs subequal. Mandi- 

 bles palpigerous. 



The rudimentary feet of the third and fourth pairs, which distin- 

 guish this genus from Caprella, are simply an oblong, styliform joint. 

 As in iEgina, the mandibles are furnished with a three-jointed palpus. 



