176 General Notes. {February, 
the appendages are well formed (after the stage indicated in Fig. 
3) the whole embryo changes its position in the egg, so as to 
approach the original attitude of the ectoblastic embryos. The 
abdomen is shifted away from its proximity to the head and 
thorax. The head moves to the anterior pole; the abdomen to 
the posterior pole; the curvature of the embryo becomes changed 
so as to invert the relation of dorsal and ventral aspects. 
15. Zrachee.—Seven pairs of minute invaginations appear on 
the sides of the abdomen, and afterwards two pairs in the thorax 
(sometimes a third in the thorax and an eighth in the abdomen, 
giving a maximum of eleven pairs). These are the entrances of 
the tracheze whose inner extremities’ are afterwards united by 
longitudinal tracheze. The salivary ducts from the third postoral 
segment to the salivary glands (sg) arise in a similar way, and 
seem to be homologous with trachee. 
16. The heart is formed as a solid cylinder of mesoblast in the 
dorsal region. It afterwards becomes hollow, the central cells 
perhaps vicariously discharged by the cornicula. 
18. The wings arise by evaginations of the dermis, the two 
plates curving to flatten themselves. 
19. The following developmental periods appear to be gener- 
ally applicable+to insects : 
(1) Preparatory to organ-budding: as segmentation, gastru- 
ation, formation of blastoderm, of germ-streak, and of 
embryonal skin. 
(2) Organ-budding. 
(3) Growth of these organs, and appearance of some new 
ones before hatching. 
(4) Post-embryonic development of larva; now the gener- 
ative organs reach full development.—G. Macloskie. 
NERVE-TERMINATIONS ON ANTENNZ OF CHILOGNATH MYRIOPODS. 
—A preliminary note upon these structures is contributed by O. 
Bütschli ; the results were worked out by Dr. B. Saupine in con- 
junction with Dr. Bütschli, but having been left in an incomplete 
condition, a brief résumé of the more important new facts seemed 
desirable. | : 
revious observers have noted the occurrence of conspicuous 
structures upon the antennz of Chilognatha, which correspond 
_ to the so-called olfactory cylinders of insects recently studied in 
-= detail by Hauser, and between the two there seems to be a 
a general similarity. 
