APODIDiE. 23 



ciliated edges, and another of an oval shape, which 

 SchoefFer says is of a red colour when the animal is alive, 

 and is swollen into the form of a small sac or vesicle. 

 This first pair of feet are the principal organs of motion 

 which the animal possesses, and have by many authors 

 been mistaken for and described as the antennse ; and cer- 

 tainly their length and the numerous small articulations 

 of which they consist cause them to resemble very closely 

 the antennae of the Decapods. They are more properly 

 called the rami. The other pairs of feet are branchial, 

 and do not serve the purpose of locomotion. They are 

 much broader, shorter, and of a lamellar structure, and 

 gradually become smaller and smaller as they descend in 

 the series, till at last they are merely rudimentary. As 

 they serve for respiration, and not for locomotion, their 

 structure is considerably different from that of the pair 

 above described ; but though altered to suit their change 

 of function, we may still trace the same structm-e per- 

 vading the whole of them. The chief portion, as seen in 

 the first pair of these branchial feet (t. T, f. e) is of 

 much the same form and structure as the basilar portion 

 of the preceding pair, and like it is divided into three 

 joints. The anterior joint gives off two large lanceolate- 

 shaped fingers or claws, strongly dentated on their edges 

 (corresponding with the two long many-articulated ap- 

 pendages of rami), and a small one of similar structure, 

 which Schoeffer denominates a fake clem (corresponding to 

 the flat daiD-like j^rodiidion of first pair). The middle 

 joint gives off a similar body, also dentated on its edges ; 

 and the posterior joint gives off a short, erect body, of a 

 somewhat similar structure (corresponding to the two 

 shorter, many-jointed appendages), Avhile it is terminated 

 by the same ciliated-edged bodies as SchoefFer calls, in the 

 first pair, false teeth. The triangular branchial plate, 

 with its strongly-cihated edges, and the vesicular plate or 

 little sac of SchoefFer, are also here attached to the first or 

 anterior joint of the basilar portion. The eight succeeding 

 pairs are very much the same as those described above, 



