308 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
over a chosen area. At the beginning of his paper there is an interesting 
note on the part which insects play in isolation. Thus, if flowers of the 
same species occur partly inside a sheltered wood and partly on the bare 
ground outside, probably not more than 5 per cent, of those outside will 
be fertilised by pollen from those inside the wood, and vice versa. This 
means, for reproduction, almost perfect isolation. 
£. MCyriopoda. 
Geophilidae of Central Europe.* * * § — Dr. C. Yerhoeff continues his 
survey of Palsearctic Myriopods, discussing the Geophilidae. He de- 
scribes two new species, Geophilus pannonicus, G. bosniensis, and several 
varieties, besides discussing already recorded species of Geophilus , Scolio- 
planes , Schendyla, and Stigmatog aster. 
The author has also f an answer to Mr. B. T. Pocock’s supplementary 
note on Yerhoeff ’s treatment of the genus Julus. 
8 . Arachnida. 
Anatomy of Scorpions.:};— Dr. Malcolm Laurie suggests that it is 
desirable to base the classification of Scorpions, at least in part, upon 
internal characters, and not, as at present, wholly upon external ones. 
He gives some notes upon the anatomy, with a view to contributing to 
this end. He finds that, in the first place, the condition of the nervous 
system is useless as a basis, as it varies greatly in closely allied forms. 
On the other hand, the structure of the eggs and the mode of formation 
of the embryo, together with the condition of the lung-books, can 
apparently be made available for systematic purposes. There are two 
types of development, in one of which the egg is large and contains much 
yolk, while in the other it is minute. The first type occurs in the 
Buthidae and many others ; the latter in Scorpio , Heterometrus , Opistho - 
phthalmus , Palamnseus, Opisthocentrus , and Hormurus. These last, 
Dr. Laurie suggests, should be placed together, and the remaining 
scorpions classified according to the condition of the lung-books. 
Structure of Thelyphonus.§ — Herr J. K. Tarnani complains that 
Dr. M. Laurie, in his paper on the morphology of the Pedipaljn. has 
overlooked some previous work by Tarnani himself, Wood-Mason, and 
Schimkewitsch. 
On the other hand, he confirms in regard to the anterior and lateral 
eyes of Thelyphonus Schimkewitschi what Laurie has observed in the 
development of the eyes of tbe scorpion. The anterior eyes appear as 
two lateral evolutions, which become distinct vesicles ; they gradually 
approach, fuse, and subsequently redivide. The lateral eyes develop 
from a thickening of the matrix on the sides of the anterior portion of 
the cephalothorax. Like Laurie, he found no external openings to the 
coxal glands of the adults of Th. asperatus and Th. Dorise 3 but in the 
embryo of Th. SchimJcewitschi they open between the first and second 
legs. The mid-gut of the embryo appears as a sac filled with yolk ; its 
epithelium arises as a longitudinal groove on the ventral surface. The 
* Arch. f. Naturgesch., lxi. (1895) pp. 346-56 (4 figs.). 
t Tom. cit., pp. 357-61. 
X Ann. and Mag. Nat. Hist., xvii. (1896) pp. 185-94 (1 pi.). 
§ Zool. Anzeig., xix. (1896) pp. 115-6. 
