ELISHA MIECHELL SCIENTIFIC SOCIETY. 61 
growths or ontgrowths (1. e. thickenings)—compare for 
instance the formation of the mesoblast of Amphioxus 
with that of other vertebrates, the invaginate gastrula of 
Leucifer with tie cor Sata stage of such a form as 
the lobster. 
If we suppose (as a basis for further work. rather 
than for any other purpose) that the common lateral an- 
lage in the ichthyopsidan embryo indicates the presence 
in the chordate ancestors of a single elongate sense-organ 
on each side of the hean, then what was the character of 
this organ? Was it a sac (groove), or merely a superfi- 
cial sensory area? It is worth while often. to put the 
question, even if the answer is not forthcoming. Cer- 
tainly the answer is not now at hand. Though merely 
putting the qnestion calls to mind the cephalic slits of 
nemerteans, and Hubrechi’s ingenious, if not very pop- 
ular theory of chordate ancestry. 
NOTES ON NORTH CAROLINA MINERALS.* 
PY J. HB. : PRALFTL. 
CONTENTS. PAGE. 
eee I NOT M BB AT Sok i ee ce eee lab hae enon es 62 
IDET BAP LTS SEA WEI 6788 oS Oe Pe SAYA LS oad devine Od i tkhdae tie Cree 70 
Nh LR ie ee Ly sisid ob pide dia hegdath es 72 
INNES, oe ee eee SE So oct wie oe dos gis bine De ars 73 
en ie ee eee dh gine ches Conte ee oe 75 
EEE MIRON EIT Ic) ele i elec fee dake vee ee dee ae 76 
PNM eo iat handy Le Wd e ahead » Gow shady ped Geen wee 79 
I I TE aed calc ced jelaca vs ive ta dnssae owabeee nee 80 
i ak. ec Kd ck wees bee 220 hing Patan oe ee 82 
INTRODUCTORY NOTE. 
The contents of this paper are notes on the North Car- 
olina minerals that have been collected during the past 
few years. Some of these have already been published 
*By permission of the Director of the N. C. Geological Survey. 
4 
