| 1884. | Zoology. 1271 
this one has been so re i 
2 ported. Itis to be hoped that such dan- 
peu ee will not prove chronic with the brilliant and saes 
Ee eg Professor C. V. Riley was awarded a gold 
i case e orestry Exhibition at Edinburgh, in October, for 
A ction of insects injuring forest trees sent out by the En- 
pnmo ogical Division of the Department of Agriculture. 
ZOOLOGY. 
, E ortuan Bopy-cavity.—The molluscan forms in gen- 
Tiimin o j most of the other metazoan groups in having or 
Picog A si ave no body-cavity, the spaces between their organs 
agent ry with branched cells forming a parenchymatous 
, mA $ e act has led the Hertwig brothers to subdivide the 
Biely-cavit Ai Cælenterates into two groups, animals with a true 
a one y lined with epithelial cells, including annelids, arthro- 
one hahake and animals with no such cavity, but with 
2 o-body-cavity of lacunar spaces among amceboid-shaped 
a, and greatly reduced its proport 
Pe a constant feature of true 
communication with the exterior throug 
excretory in function but also often reprod 
i nication with the exterior 
Ne remains of a body-cavity, 
thet seen Upon this view the 
Molluscan kidney and pericardiu 
| m becomes intelligible. 
ther relatio: formed that there is a fur- 
ther relation between the renal organs and the generative system 
that in the mollusks the 
ie ‘ system, and open to 
or by a special duct directly continuous i 
fhe is very unlike the animals with a „cavity, for in them 
“e genital organs very generally are related to the body-cavity 
pE 
„Mitt. Zool. Stat. Neapel, Vol. 1V, p- 4230- 
Quart . Jour. Mic. Sci., July, 1883, 
: itschr. f. w. Zool., XXIX, p- 583- 
