136 Mr. C. J. "Wltli on Chelonethi 



bear out this o[)i>non. The two parts into which the coxal 

 sac is divided are of very unequal size ; the basal, which is 

 nearest to the postero-iuterior corner, is only liali' as spacious 

 as the distal part. The two portions are dorsally and laterally 

 separated, from each other by a rather deep groove as well as 

 a chitinous ring (figs. 4e-f), but ventrally there is no such 

 distinction (figs. 4c-e). Not only tlic outer surfaces, but 

 also the inner cavities, are well marked off from each other 

 except ventrally. Just between the two portions, and, as it 

 seems, fastened to the above-mentioned ring, we find a 

 " funneP" of hairs, which is open below (figs. 4 e-/, b-f). 

 There is consequently no direct communication between the 

 two cavities except ventrally. The units which build 

 up the funnel are of two kinds ; its wider basal portion is 

 more solid and seems to have been formed by the fusing 

 of elongated tubercles like those with which the inner walls 

 of the distal sac are beset. These tubercles are not in 

 every case all fastened behind to the above-mentioned ring, 

 because at least some are seen to be free posteriorly and 

 project into the distal cavity (fig. 4e). The more narrow 

 distal part of this funnel is composed of a number of long, 

 slender, and pointed hairs which converge towards each other 

 and are directed through the round eutranee-openii.g (o) of the 

 sac (t) . This entrance opening, which is found just at the end 

 of the organ, is, at least in other species, connected with an 

 opening in the ventral wall of the coxae, and the above- 

 mentioned hairs project through this opening. The dorsal 

 and partly the lateral walls of the distal cavities are provided 

 ■with subconical tubercles which project into the lumen 

 (figs. 4e-f,Ji); each tubercle bears at least one terminal 

 pointed hair. Thes^e tubercles are sometimes supported by 

 chitinous ridges. The skin of the coxal sac is everywhere 

 minutelv granular. 



III. — Abnormal Segmentation. 



Chelifer sculpturatus, Lewis. (PI. VIII. fig. 2 a.) 



One of the di-icd females of this species which I examined 

 showed some abnormalities in the segmentation. The first 

 abdominal tergite is normal (PI. VIII. fig. 2 a) ; all the fol- 

 lowing are, as usual, divided into a right and a left portion 

 by a longitudinal line. The left portions of the second and 

 third tergites aie well separated laterally, but fused in the 

 middle, because the gi-oove between them has been gradually 

 abolished. The depressed areas and the ridges between shoM- 



