M. A. Stecker on a neiv Genus of Arachiida. 237 



that in Cyplioplitliahims we have to do, not with any coxal 

 process of the hypopodia, but with distinctly developed cox^, 

 although by retrogression amalgamated with the pectoral 

 pieces. The ditfcrent joints nearly resemble those of Gyphoph- 

 thalmus. A long trochanter is followed by a clavate femur ; 

 on the femur follows a tibia furnished with a visible patella ; 

 and lastly comes a two-jointed tarsus. The claw-joint is 

 strongly hairy, thickened into a cushion on the sole, and 

 soldered to the first tarsal joint ; it differs essentially from the 

 small movable claw-joint of the Chernetida3 (A. Stecker, 

 Ueber indische Chernet. p. 9, Taf. iii. fig. 6). Each claw- 

 joint bears a simple, moderately curved, acute claw. The 

 legs of the Cyphophthalmidas differ from those of the Phalan- 

 giidte and Chernetidai, in the first place, by their two-jointed 

 tarsus (in the Phalangiidte the tarsus is four-jointed, in the 

 Chernetidffi the claw-joint is rudimentary), and secondly in 

 the number of the claws (in the Phalangiida^ the two hinder 

 pairs, and in the Chernetidaj all the pairs of legs are furnished 

 with two powerful and often curiously formed claws). 



The abdomen is distinctly segmented ; eight abdominal seg- 

 ments may be distinguished. The chitinous layer of the upper 

 abdomimal half-rings is not, as already remarked, shield- 

 like as in Cyplioplitkalmus and many Chernetidje [CherneSj 

 Chelifer)^ but is most nearly comparable to the cuticle of 

 Chtlionius. The inferior half-rings of the abdomen nearly 

 resemble the upper ones ; each of them is furnished at its 

 hinder margin with a row of plumose setules *. The first 

 ventral half-ring represents an obtuse-angled triangle, with 

 the obtuse angle directed forward. It is furnished with an 

 elliptical genital aperture^ from which a very long penis, 

 comparable to that of the Chernetidas, protrudes. The differ- 

 ence in the position of the genital aperture is that in Cypoph- 

 thahnus the genital aperture occurs between the posterior mar- 

 gin of the metathorax and the anterior margin of the first 

 ventral half-ring, in Gibocellum in the first ventral half-ring, 

 but in the Chernetidte between the posterior margin of the 

 second and the anterior margin of the third ventral half-rings. 

 In all Chernetidffi, moreover, we distinguish two ram's-horn- 

 like male transferrers f, the structure of which resembles that of 

 the tracheal stems, so that by their means the penis can be 

 greatly elongated. 



* I liave figured such setules of similar structure in the memoir " Ueber 

 indische Chern. /. c. Taf. 2. figs. 5c & 6c. 



t A monograph on the anatomy of the Chernetidse is now ready for 

 printing. It contains many figures of the internal organs of these little 

 creatures ; and I believe that I shall be able to publish it in the course of 

 next year. 



