1884.] Progress of N. A. Invertebrate Paleontology for 1883. 385 
It remains to formally tabulate the renumeration of spinal 
nerves and the reconstruction of the plexuses which I recom- 
mend for adoption : 
OLD STYLE. 
Plexus, Cervical 
[Four] 
Intercostals } 
[Ten] 
Plexus, Lumbar 
ive 
[Five] 
[Lumbo 
4 Sacral 
‘ 
f 
1 
: 
sacral 
cord] 
Prepared 
N. Cervical First. 1| 
* & Second. 2| 
? x hir 3 
+ (f - Fourth: 4 
7 dg Fifth. 5 
veic Sixth. 6 
n “ Seventh. 7 
m “« Eighth. 8 
N. Dorsal First. 9 
gd as co 10 
sd AUNA Oe 
H w Fourth. -rs 
es p Fifth. 13 
s m Sixth. 14 
ig " Seventh. 15 
y oe ighth. 16| 
= os Menthe £7 
= “ee Tenth. 18 
os “ Eleventh. 19 
a “« Twelfth. 20/20. First Lumbar N, 
N. Lumbar First. 21 Second “ E 
kg y cond. 22| 22. m s - 
tis cent Ry eS re 05 
Ao on a Romthoag] 34. Pifh | tron 
eeta sec EFifth, 25125, First Sacral N. 
N. Sacral First. 26| 26. Second : 
Mee neend 27 ar Tad S S 
K crs Third. 28128. Font zi . 
ng “ Fourth. 29 | 29. Fifth e Hi 
n . Fifth. 30 | 30. First Coccyg. N. 
N. Coccyg. First. 31 | 31. Second “ A 
N N w e o e y y y e e 
ea ae a aa Soe Bah a 
n ae 
New STYLE. 
First Cervical N. 
Second * “ 
1 ir “ “ 
Fourth “ “ 
Fifth u ie 
. Eleventh “ ex 
Twelfth “ hin 
„At 
. 
BY J. B. MARCOU. 
Cervical Plexus 
[Four] 
[upper 
cord] 
hial 
Brachi 
[lower Plexus 
} cord] [Five] 
_ Intercostals. 
[Ten] 
larg 
Sacral 
Plexus 
small [Five] 
A REVIEW OF THE PROGRESS OF NORTH AMERI- 
CAN INVERTEBRATE PALAZZONTOLOGY FOR 1883. 
I HAVE taken up the task of preparing this brief review at the 
_ Fequest of Dr. C A. White, who, for several years past, has 
laws fies Similar one, but whose numerous avocations do not 
aot ‘Sufficient time for continuing his publication of such a review. 
ring the latter part of the year invertebrate palzontology 
YOL, xvin. —wo. ry. 
25 
