536 BRITISH ORIBATIDiE. 



divided into hoo segments by a straight, transverse cut 

 a little anterior to the middle. The median portion, 

 which contains all the organs, and is of substantial 

 thickness, is practically a continuation of the conical 

 form of the cephalothorax, but the sides for the greater 

 part of the length are broad, thin, semi-transparent 

 expansions or blades. These expansions commence 

 with rounded shoulders close to the cephalothorax, 

 have convex and slightly undulated exterior margins, 

 and terminate at the broadest part of the median cone 

 about a quarter of the distance from the hind margin. 

 The solid median portion is divided by four or five 

 transverse constrictions. Progaster rather concave ; 

 the hind margin strongly undulated, with a central 

 point, the median solid part of the notogaster is arched, 

 the lateral expansions depressed, ahnost to the ventral 

 level. There are four longitudinal rows of very long, 

 curved, almost filiform hairs on the notogaster, two at 

 the outer edge of the anterior division of the lateral 

 expansion on each side, and a few smaller hairs round 

 the hind margin. The dorsal plate is very greatly 

 suflSexed on to the ventral surface ; the ventral plate 

 is small and inversely conical. Genital and anal plates 

 of moderate size, close together, and set far back ; the 

 former are short, oblong, rounded anteriorly, the latter 

 more lengthened, and reaching the hind margin. 



Is practically similar to the adult, but is very much 

 paler in colour. 



As it has been doubted whether this creature is 

 mature I have thought it best to figure the egg, which 

 may be easily seen within the body of the female, 

 easily dissected out and examined, and may also be 



