INVEKTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 865 



called the trahecula, the " Vorderhorn " becomes the cauliculus, the 

 "Hinterast" (Pilztheil, Dielt), the peduncle, the "mushroom body" 

 of authors the corpus fungi for me, its trough-like portions — " Becher " 

 of Flogel — the iimer and outer calices, and the " Centralkorper " the 

 corpus centrale. 



The most successful sections were prepared from a specimen 

 hardened in osmic acid. 



Nerves of the Proboscis of Diptera.* — M. Jules Kiinckel has 

 examined into the terminations of the nerves in the proboscis of the 

 Diptera, He remarks that the proboscis terminates in two valves, 

 which, in repose, are laid against each other, but during suction are 

 aj^plied to the surface attacked so as to constitute a regular sucking 

 cup. These valves represent the labial palpi. Their internal struc- 

 ture presents a peculiarity well known to microscopists ; they contain 

 a large tube, from which issue numerous branches in a digitate form, and 

 all these parts present an ajipearance like that of tracheae. The name 

 of false trachece which has been given to them is perfectly justified, 

 as they have no communication with the true tracheal apparatus, 

 their principal function being to support the integuments of the 

 palpi, whilst a true trachea ramifies in these organs. Parallel to the 

 large trunk of the false tracheae the labial nerve may be traced, of 

 comparatively large size. It speedily divides into two parts, and 

 emits a multitude of ramifications to the periphery and inner surface 

 of the valves. Those nervous filaments which run to the periphery 

 go to the numerous and greatly developed hairs with which the 

 margin of the valve is furnished ; those which go to the inner surface, 

 on the contrary, terminate at rudimentary hairs, reduced to a minute 

 ehitinous cylinder. 



On examining the nervous terminations which run to the marginal 

 hairs, it will be found that a filament separates from the ganglionic 

 inflation, and goes to the hair, as has been already described and 

 figured by M. Jobert, but that it terminates in the interior of the 

 hair at the point where the latter is joined to the integument by a 

 membranous part. On the other hand, in the case of the terminations 

 which go to the rudimentary hairs, the filament will be seen to tra- 

 verse the little cylinder and project outside in the form of any fine 

 and delicate rounded point. There are thus in the proboscides of the 

 Diptera (Muscidfe and Syrphidfe) two kinds of nervous terminations 

 — one set connected with well-developed hairs, which are no doubt 

 tactile in function ; the other, with rudimentary hairs of peculiar 

 form, which are probably gustative. 



Sense-organs of Insects.f — With regard to the results announced 

 by Professor Graber,J as to the presence of an otocyst in the antenng© 

 of certain Diptera, Dr. Mayer declares that independent investigations 

 made by himself on the same species show that the organ in question 

 is open to the exterior, and therefore not otocystic. Further, he 



* ' CE. Assoc. Fran^. Avancem. Sci.,' 1878 (1879) p. 771 ; see ' Pop. Sci. Eev., 

 iii. (1879) p. 444. 



t 'Zool. Anzeiger,' ii. (1879) p. 182. 



J ' Arch. Mikr. Anat.,' xvi. (1878) p. 36 ; see this Journal, ante, p. 45. 

 VOL. II. 3 M 



