1884. | Zovlogy. 201 
do the adults, I have shown that at considerable depths, even in 
winter, the large adult has been known to shed. Had Mr. Koon 
consulted the article referred to he could not have written, “ We 
are led to believe that large Limuli rarely, possibly never, shed, 
because among all those examined, there were no large exuviz.” 
On seeing the act of exuviation by a large Limulus, an officer of the 
United States Army, at the fort at Sandy Hook, N. J., exclaimed: 
“The animal is spewing itself out at its mouth !”—S. Lockwood. 
SocraFr’s EMBRYOLOGY OF THE CHILopop Myriopops—We 
have received from the author an elaborate memoir, unfortunately 
in the Russian language, and with no complete abstract in Frenc 
or German, on the embryology of two species of Geophilus (G. 
Serrugineus and proximus). It is a large*quarto brochure of 77 
pages, dated Moscow, 1883, with the illustrations, printed some- 
times in three colors, inserted in the text; as the drawings of the 
sections and complete embryo are on a large scale, one can form 
Some idea of the nature and high value of the author’s work. 
The bibliographical references are full and satisfactory. Beginning 
with careful comparative descriptions of the two species of Geophi- 
lus, whose development is described, the internal reproductive 
organs are figured and elaborately described. Ina partial abstract 
which appeared in the Zoologischer Anzeiger for Nov. 6, 1882, 
states that the best material for his researches were the 
above-named species of Geophilus. The Lithobii present much 
more difficult material for study, as their eggs are scattered in 
the earth or in the humus of decaying vegetation, and are like 
small particles of sand, from which they often can with difficulty 
be distinguished ; besides this the egg-membranes are unusually 
thick, rendering them difficult to study. The eggs of the .Ge- 
pai lie under the bark of trees (G. proximus) or in sandy soil 
- ferrugineus) in small bunches, eighteen to thirty-five in num- 
arn are protected and watched by the female. It is very 
attac ltto keep the eggs alive in confinement, since they are 
ki aiad by fungi. Itis also almost impossible to study the eggs 
i stages of one and the same brood, so that one has to make 
oy daily excursions for material for study. 
i hiain® Ovarian eggs. At this stage the egg is filled with yolk, 
. tion the germinal vesicles and yolk nucleus; but on one oc- 
- a nucl 
t and exhibiting division of its chromatin into two groups 
Dii a found in the center, probably derived from the 
vesicle., The nucleus and protoplasm divide into a 
