1882.] Position of Ganglia, Sfc, in Scorpions. 101 



left between the projecting trabecule. The latter are the true 

 u lumen " of the gland. The structure of the central portion of the 

 coxal gland of the Scorpions differs from that of its periphery, to which 

 the previous description refers. 



Conclusion. — It does not seem possible to doubt that the coxal 

 glands of the Scorpions and of Limulus are homologous structures. 

 Though no external opening has been found as yet, in either the one 

 case or the other, it is possible that such an opening exists. Though 

 glands in a similar position (at the bases of the limbs or jaws) are found 

 in other Arthropoda, there are none known which agree so closely in 

 position and structure with either the coxal glands of Limulus, or of 

 Scorpio, as these do with one another. Possibly such coxal glands 

 are in all cases the modified and isolated representatives of the com- 

 plete series of tubular glands (nephrida) found at the base of each 

 leg in the archaic Arthropod, Peripatus. 



P.S. — 1 may add that since writing the above, I have found a 

 similar pair of glandular organs in a large South American Mygale, 

 which I received from the Zoological Society on the day of its death, 

 in the Insect House at Regent's Park. The coxal glands in Mygale 

 are elongated and lobed as in Limulus. They rest on the dorso- 

 lateral region of the entosternite. 



VI. "Note on the Differences in the Position of the Ganglia of 

 the Ventral Nerve-cord in three Species of Scorpion/ 5 By 

 E. Ray Lankester, M.A., F.R.S., Jodrell Professor of 

 Zoology in University College, London. Received May 25, 

 1882. 



No one who is acquainted with the researches of George Newport 

 can doubt the general accuracy of his description of the nervous 

 system of an " Androctonus." Very probably the Scorpion which he 

 made use of for his researches on the nervous system was Androctonus 

 funestus, Ehr., the same which I have received in the living condition 

 from North Africa. 



The accuracy of Newport's description in a very material point, 

 and one which refers to a very obvious feature, has been called in 

 question by Leon Dufour. Dufour dissected a species closely allied to 

 A. f unestus, one which is little more than a small European variety of it, 

 namely, A. occitanus. Yet he gives an account of the disposition of 

 the ganglia of the ventral nerve-cord, and of the innervation of the 

 four pairs of pulmonary sacs, which is widely different from that of 

 Newport. 



I am able to confirm the general accuracy of Newport's account by 

 my dissections of A. funestus, and have been in much doubt as to 



