CAPRELLIDEA. 



819 



first two joints of the superior antennae, the legs of the first pair 

 stouter, the head about one-third the length of the first thoracic seg- 

 ment. The finger of the hand of second pair reaches nearly two-thirds 

 of the way to the base, and closes beneath an acute process or tooth. 

 The hands of the first pair are rather more than half as long as those 

 of second pair. 



The second pair of legs in the specimen figured is united to the 

 posterior part of the second thoracic segment, and the individual was 

 therefore a male. The basal joint of this pair of legs is slender, and 

 about as long as the segment, and also about as long as the hand. 



2. Caput non armatum nee rostratum. 



Caprella januarii (Kroyer). 



Maris : — Corpus gracillimum, segmento thoracis \mo quadruplo longiore 

 quam caput, 2do lmove gracili duplo longiore quam Mum. Antennae 

 lmce dimidio corporis longiores, 2dis plus duplo longiores, articulo 

 lrno breviore quam 2di dimidium, flagello brevi, valde breviore quam 

 articulus precedens. Branchiae elongato-ellipticce. Manus paris se- 

 cundi oblonga, palmd pubescente, dentibus acutis duobus armatd et 

 altero intermedio obsoleto. 



Body very slender, first segment of thorax four times as long as the 

 head, second or first quite slender, and either twice as long as 

 third. Superior antennas longer than half the body, and more 

 than twice the length of the inferior; first joint not half as long as 

 second; flagellum much shorter than preceding joint of base. 

 Branchiae narrow-elliptical. Hand of second pair of legs oblong, 

 palm pubescent, and armed with two acute teeth and another obso- 

 lete intermediate. 



Plate 55, fig. 2 a, animal, enlarged ; b, probably the female ; c, part 

 of flagellum of the superior antennae ; d, extremity of inferior pair ; e, 

 hand of second pair ; /, extremity of leg of last pair. 



Rio Janeiro ; from the anchor, in ten to twelve fathoms. 



Length, one and one-fourth inches. Head quite small, obtuse in 



