60 



OLFACTORY CONES IN INSECTS. 



nieris, and other centipedes. He also described similar 

 cones in certain insects. 



Further details with reference to the structure and 

 arrangement of these bodies have been given by Claus, 

 Sars, Weissman, Kougemont, Gamroth, Heller, Hensen, 

 Hauser, and others, who have also ascribed to them 

 this function. In Claus's opinion, the nerve itself 

 enters these bodies. On this point, however, there is 



Fig. 37.— End of a palpus of Staphy- 

 linus erythropterus, x 600 (after 

 Leydig). a, Olfactory pit. 



Fig. 38.— Part of antenna of Callianassa sub- 

 terranea. b, Olfactory hairs ; g, peculiar 

 curved hairs. 



still much difference of opinion. At any rate, it seems 

 to be established, by the most recent observations, that 

 even if the cones are in some cases closed at the end, 

 they certainly remain open in others. Similar organs 

 also occur in the palpi (see Fig. 37). 



Kraepelin describes other peculiar forms of hairs to 

 which he ascribes the perception of smell, as occurring 

 in all the stalk-eyed Crustacea (Podophthalmata). 



