170 MB. G. C. BOURNE ON THE 



ButgcUi describes a proximal set of large nucleated ganglion- 

 cells, aud a distal series of smaller sense-cells as occurring in each 

 bundle. It is evident from his figures that the cells which he 

 calls true sense-cells correspond with those which I have described 

 as ganglion-cells ; whilst he has taken the large oval nucleated 

 cells referred to above to be ganglion-cells occurring in the 

 proximal end of the sense-organ. But the cells in question lie 

 outside the nervous bundles, among the connective tissue which 

 surrounds them ; they have not the structure of ganglion- cells, 

 and are found in all parts of tlie antenna, and are by no means 

 confined to a zone surrounding the proximal ends of the nervous 

 masses in the terminal joint. In the proximal part of the antenna 

 these cells are confined to definite spaces in the connective tissue, 

 and T believe that they are nothing more than blood-corpuscles, 

 which would be amoeboid in the living state, but have assumed 

 an irregularly oval shape under the action of spirit. Definite 

 lacunar channels appear to lead through the antenna, and to open 

 into relatively large lacunar spaces which surround the proximal 

 ends of the nervous masses in the last joint. Hence in spirit 

 specimens one finds a mass of blood-corpuscles aggregated round 

 the nerve-masses, and more particularly around that part which 

 I have described as being a neurospongium. In thick longitu- 

 dinal sections these cells appear to form part of the nerve-sub- 

 stance ; but in thin sections and in transverse section (fig. 13) 

 they are easily seen to be quite distinct from it. 



No doubt, as Biitschli says, the antennary organs of the Diplo- 

 poda are comparable with those of Peripatus on the one hand 

 (see F. M.Balfour, " Anat. and Devel. of Peripatus capensis," 

 Quarterly Journ. Micr. Science, 1883, p. 213), and with those of 

 Vespa Grahro and other insects on theother (see Hauser, " Geruchs- 

 organ in Insecten," Zeits. f. "Wiss. Zool. xxxiv. p. 367). Hauser 

 adduces physiological proof of the olfactory function of these 

 organs in insects ; but without definite proof I should hesitate to 

 attribute the same function to the organs of Diplopods, and 

 prefer to call them simply " antennary organs." 



It is commonly stated that there are no auditory organs m 

 Myriapoda, but the existence of a stridulating organ in the male 

 SpJicerotherivmi postulates the existence of an auditory organ, in 

 tlie female at any rate. Leydig, in his ' Tafeln zur verglei- 

 chendeu Anatomie ' (erstes Heft, Taf. vii. figs. 3 and 5), figures 

 what he calls an " eigenthdmliches Sinnesorgan " occurring on the 



