M. A. Stecker on a new Genus of Arachnida. 237 



that in Cyyliophtlialmus \^q have to do, not with any coxal 

 process of the hypopodia, but with distinctly developed coxa3, 

 although by retrogression amalgamated with the pectoral 

 pieces. The different joints nearly resemble those of Cyphoph- 

 thahnus. A long trochanter is followed by a clavate femur 5 

 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 Chernetidfe (A. Stecker, 

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

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

 legs of the Cyphojjhthalmidaj differ from those of the Phalan- 

 giida; and Chernetida3, in the first place, by their two-jointed 

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

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

 the number of the claws (in the Phalangiidai the two hinder 

 pairs, and in the Chernctidaj 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 Cyphopldhahnus and many Chernetidaj {Chernesj 

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

 ChtJi07iius. 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 Chernetidge, protrudes. Tiie differ- 

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

 thalmus the genital aperture occurs between the posterior mar- 

 gin of the metathorax and the anterior margin of the first 

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

 but in the Chernetidai between the posterior margin of the 

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

 In all Chernetidai, 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 have figured such setules of similar structure in the memoir " Ueber 

 indische Chern. I.e. Taf. 2. figs. 5c & Gc. 



t A monofjrraph on the anatomy of the Chernetidas is now ready for 

 printing-. It contains many figMros of the internal organs of these little 

 creatures ; and I believe tliat 1 shall be able to puIjHhIi it in the course of 

 ne.\t vear. 



