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



tipper wall of the sheath of the penis, formerly regarded as 

 testes, I was unfortunately unable to detect in Gihocellum, 

 although I am convinced that they occur in this animal. 



The nervous system in Gibocellum consists of two large 

 ganglia situated in the cephalothorax (supra- and infraoeso- 

 phageal ganglia, cerebral and thoracic ganglia), which send 

 oif the nerve-trunks — the supraoesophageal ganglion the nervi 

 antenyiarum and oj)t{ci, and the thoracic ganglion the nerves 

 of the two pairs of maxillary palpi, the three pairs of legs, and 

 the abdomen. The two large abdominal nerve-cords unite 

 after a time, as in Phalangium, to form two pyriform ganglia, 

 and then immediately run off into the abdomen. The cerebral 

 ganglion is distinctly paired as in the Galeodea * and Phalan- 

 giida? ; the thoracic ganglion has a radiate form. The first 

 two T)yriform ganglia appear to me to represent the cephalo- 

 thoracic ganglia discovered by Newport f in the scorpions. 

 A complex visceral nervous system is also demonstrable in 

 Gibocellum. The H-shaped chitinous skeletal plate observed 

 by Treviranus \^ Tulk §, and Leydig ||, closely applied to the 

 nervous centre, and serving for the attachment of the muscles, 

 was clearly observable in Gibocellum. It lies here close to the 

 ventral nervous mass, and has the form of a Russian i (I/I) % 

 The animal runs forwards and backwards, and also in a 

 curved line obliquely sideways; I observed no leaping- move- 

 ments like those of the Chernetidte {Ghtlionius) . 



From all that I have been able to state with regard to the 

 new genus, it appears that Gibocellum may indisputably be 

 ranged in the family Cyphophthalmidte discovered by Dr. 

 G. Joseph. The differences existing between the two genera in 

 comparison with other characters which these genera possess in 

 common are not of sufiicient importance to allow us to found 

 new families (or orders) upon them. But as I have already 

 elsewhere ** grouped the Chernetidie as an order, I must also 

 indicate the Cyphophthalmidge as an independent order of 

 Arachnida. As regards the systematic position of this order, 

 I have already several times had occasion in this memoir to 



* Ami. des Sci. Nat. st§r. 3, tome viii. p. 227. 



t Pliil. Trans. 1843, pp. 243 et seqq. 



X Verai. Schrifteii nat. unci phys. Inh. 1816, i. 



§ Loc. cit. p. 325. 



II Arch, fiir Anat. und Phys. 1862, pp. 196 et seqq. 



^ A detailed monograph, entitled " Anatomisches vmd Ilistiologisches 

 iiber Gihocelhnn, eine neue Arachnide," with fiye plates, will appear in the 

 course of the present year. 



** " Zur Kenntniss der Chernetidenfauna Bohmens," Sitzungsh. der 

 kon. bohm. Ges. der Wiss. 1874, and " Ueher die geogr. Yerhr. der europ. 

 Chernetideu," in Arch, fiir Naturg. 1875, p. 159. 



