272 Scientific Intelligence. 
duce the chalk to run along, only in the direction of the high mountain 
ridge of the volcanos, and only in a narrow band, and never to descend 
into the plains}! In the whole of Brazil, in the wide regions of La 
Plata, Paraguay, Bolivia, the chalk is never again seen, and indeed 
extensive and easily attainable scale ? 
» Darwin has followed the cretaceous strata to the extreme point of 
; og 
_ tension towards the Pole. 
a be eh IIL. Zoonoey. 
RL. Contributions to the-Natural History of the Acalephe of North 
- ‘America; by L. Agassiz: Part I, on the Naked-eyed Meduse of the ‘ 
_~ shores of Massachusetts in their perfect state of development, (Trans- . 
actions of the American Academy of Arts and Sciences, 2nd Series, 
Jy 
? hae. ustrated by beautiful as well as faithful engravings. The species de- 
ce, ¢ ys ved are Sarsia marabilis, Hippocrene superciliaris, Tiaropsis aia- 
sy”. demata, and Staurophora laciniata. “ge a oe, 
~~". - Piof. Agassiz, in the course of his memoir, makes:some observal 
* Ch the classification of these animals, and gives reasons for including 
* 
* 
his 2 
4 
Pty * 
. 
d -specks along this margin; mout 
eye-specks along g fis Re 
i y 
ym- 
other 
