CRYPTOTHIRIA BALANT. 271 



flagellum. The lower antennae are strong and elongated, 

 consisting of four large basal joints, gradually diminishing 

 in length and thickness, and terminated by an articulated 

 flagellum. The seven segments of the body are furnished 

 with the same number of legs, of which the first and 

 second pairs are shorter and more robust than the rest, 

 and terminated by an oval palm and a movable finger.* 

 The remaining five pairs of legs are long and slender, the 

 seventh or last pair especially being longer than the rest. 

 The tail is obconical, the five anterior segments being 

 furnished on the underside with as many pairs of 

 branchial appendages, each consisting of an oblong basal 

 piece, bearing two terminal branches, of which 

 the inner is long and conical, and the outer 

 shorter and pointed. Buchholz, on the con 

 trary, represents them as consisting of a dilated 

 basal subtriangular joint, terminated by two 

 I oval or suboval plates, strongly fringed at the 

 posterior margin with long setae. 

 The transformations which this minute active pedi- 

 gero\is animal undergoes in assuming the adult female 

 form have been carefully observed and figured by Dr. 

 Buchholz. In the earliest of these changes we observe 

 a striking analogy with the form of the female Anceus, 

 the three posterior segments of the body coalescing, 

 losing their articulated character, and swelling out into a 

 large mass, in which the segments are only indicated by 

 lateral impressions ; those of the tail, however, remain- 

 ing distinct. i" In the following stage the tail is entirely 

 absorbed, forming a terminal exarticulate conical mass, 

 continuous with the lobes of the body, but with the 



* In our sjsecimen we could not determine tlie precise form of tlie first 

 pair of legs, and wliich are not quite correctly given in our figure, 

 t See Vignette in page 260. 



