4 Myr. 
MYRIOPODA. 
was the same. Their origin is probably simultaneous. The protoplasm 
masses at their apices sink into the pyramids and form the primary endo- 
derm ; while the central protoplasm masses coming to the surface of the 
ovum form the primary ectoderm. The blastoderm at first consists of 
large thin cells, dividing very rapidly into a number of minute cells, 
smaller on one side of the ovum than on the other. On this side, the 
primitive streak appears, the anterior end appearing first. The first seg- 
ments with their appendages are developed before the hinder portion of 
the streak is clearly seen. Before the appearance of the streak, however, 
the mesoderm is divided off from the ectoderm. The conversion of the 
yelk pyramids into ondoderm begins at the same timo as the lloxiou of the 
embryo, at a stage not observed by Metschnikoff. 
24. TOmOsvary, J. Eine neue Myriapoden-Gattung uud Art. Edenti- 
stoma octosulcata. Term, fiizetek, v. pp. 298 & 299, pi. ii. 
25. Vosges, E. Das Respirationssystem der Scutigeriden. Zool. Anz. 
v. pp. 57-69. 
The respiratory system of the Scutigeridce , which is minutely described, 
is, in spite of the peculiar position of the stomata and the absence of the 
usual spiral thickenings of the walls of the tracheae, a true tracheal sys- 
tem. Even its peculiarities find analogues in other Myriopoda. 
26. Weber, M. Uber eine Cyanwasserstoff satire bereitende Driise. 
Arch. mikr. Anat. xxi. pp. 468-475. 
[ Cf ’ Guldensteeden-Egeling, supra."] 
27. . Blaniulus guttulatus nello patate. Bull. Ent. Ital. xiv. pp. 404 
& 405. 
Note on the occurrence of this Myriopod in potatoes in France. 
A general sketch of Myriopoda by W. S. Dallas in vol. vi. of Cassell’s 
Natural History, edited by P. M. Duncan. London : 1882, 4to, p. 158 
et seq. 
Dubious estiuiate of 50 Myriopods in British India ; W. T. Blanford, 
Rep. Brit. Ass. li. p. 678. 
For Myriopoda of Tyrol, see Dalla Torre, posted , Insecta, p. 3. G. 
Joseph, B. E. Z. xxvi., in a list of Arthropods found in the Tropfstein 
Caves, Carniola, describes JBrachydesmus subterraneus, C. Heller, var. n. 
fragilis , p. 23, from various caves in Lower Carniola, and Scolopendrella 
immaculata , Newp., var. anophthalma , p. 24, cave at Gurk. 
A note by J. Chatin on the structure of marginal cells in the Mal- 
pighian tubes of lulus terrestris ; Ann. Sci. Nat. xiv (3). 
Lithobius . Twelve species from the Caucasus described by Selivanoff, 
TroudyEnt. Ross. xii. pp. 177-198, pi. i., including besides new species, 
L. viriatus , Sel., and van*, multidentatus and similis , pp. 182-184, A. muta- 
bilis , Koch, fig. 6, p. 186, and L. pusillus , figs. 19 & 20, p. 193. 
