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



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

 testes, I was unfortunately unable to detect in Gibocelluniy 

 although I am convinced that they occur in this animal. 



The nervous system in Gihocellum consists of two large 

 ganglia situated in the cephalothorax (supra- and infraoeso- 

 phageal ganglia, cerebral and thoracic ganglia), which send 

 off the nerve-trunks — the supraoesophageal ganglion the nervi 

 antennarum and optici, 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 nei-ve-cords unite 

 after a time, as in Phalangium, to form two pyi-iform ganglia, 

 and then immediately mn off into the abdomen. The cerebral 

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

 giidse ; the thoracic ganglion has a radiate form. The first 

 tAvo pyriform ganglia appear to me to represent the cephalo- 

 thoracic ganglia discovered by Newport t in the scorpions. 

 A complex visceral nervous system is also demonstrable in 

 Gihocellum. The H-shaped chitinous skeletal plate observed 

 by Treviranus :j:, Tulk §, and Leydig 1|, closely applied to the 

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

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

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

 The animal nms forwards and backwards, and also in a 

 curved line obliquely sideways ; 1 observed no leaping- move- 

 ments like those of the Chernetidfe [Chthonius) . 



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

 new genus, it appears that Gihocellum may indisputably be 

 ranged in the family Cyphophthalmidfe 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 sufficient importance to allow us to found 

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

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

 indicate the Cyphophthalmida? 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 



* Ann. des Sci. Nat. s^r. 3, tome A-iii. p. 227. 



t Phil. Trans. ]84.3, pp. 243 et seqq. 



X Verm. Schriften nat. und pbys. Inh. 1816, i. 



§ Loc. eit. p. 325. 



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



% A detailed monogi-aph, entitled " Anatomisches mid Histiologisches 

 iiber GiboeeUum, eine neue Arachnide," with five plates, "will appear in the 

 course of the present j'ear. 



** " Zur Kenntniss der Chernetidenfamia Bohmens," Sitzmjgsb. der 

 licin. biihm. Ges. derWiss. 1874, and " Ueber die geogi'. Verbr. der eiirop. 

 Chernetiden," in Arch, fiir Xalm-g. 1875, p. loO. 



