Botany and Zoology. — 281 
ach, how do the embryos hatching from those eggs reach a suitable place 
for their development into -hydatids, which place is, in the sheep, the 
brain? It had been erroneously assumed that they bored with their 
spines recta via from the stomach through all the tissues and organs until 
they reached the brain. Accordingly, in the hog, the embryos of the 
Tenia would have to go from the stomach into the muscles; in the rat, 
into the liver; and in the ox, into the lungs; for it is only in these par- 
ticular organs that these hydatids are found. 
R. Leuckart, howéver, discovered the way in which the embryos actu- 
ally reach their destined resting places. On feeding rabbits with the eggs 
Tenia serrata, he found that, some hours after the feeding, the egg- 
shells were already dissolved into prismatic granules by the juices of the 
stomach, and the embryos set free. But on putting the eggs immediatel 
in the intestine ee an artifical opening,) they were not hatched. It 
t 
4. Depth of Molluscs of Peconic and Gardiner’s Bays, Long Island, 
W. ¥.; by Sanperson Sura. (Communicated for this Journal.) 
Name. Depth. Remarks. 
*Loligo illecebrosa,* Large and abundant. 
Ranella caudata, i —to 10 f, |Moderately abundant. 
Pyrula canaliculata, Abundant. 
Pyrula carica, uw.tol0f.| 
buceinum plicosum, a. w.to10f.|Large and abundant. 
ne obsoleta, Littoral. soe + amon 
a8sa trivit 2 f. to 10 f.|Abundan 
SColumbeia avar |.w.to 10 f,|Moderately abundant. 
olmbella Gouldian Rare. 
poltmbella lunata, me L.w.to 10f. 4 abundant. 
€urotoma cerinum,* re. ; 
ex urotoma plicatum, 2  |Notso rare as preceding. 
nation heros, 10f. |Rare and small. 
Natica duplica es 
we triseria - 2 f to 10 f, Mod. abundant. 
pusilla,* + | | |One dead 
