786 General Notes. | December, 
apart from the normal Crustacea, and form the living representa- 
tive of a subclass, equivalent to all the other living haaba 
To Limulus are closely allied the fossil Merostomata; and w 
regard, for reasons already stated, the Trilobites as daisi allied 
to the Merostomata. 
For this subclass we have proposed the name Pa/eocarida, and 
for the normal Crustacea we have proposed the term Neocarida. 
In order to express the relations of the two subclasses of Crus- 
tacea, we have published! the following table showing the mode 
of grouping of the different orders of the two subclasses of the 
class of Crustacea : 
CLASSIFICATION OF THE SUBCLASSES AND ORDERS OF CRUSTACEA. 
“™ 
$ ; 8 3 
Fia g 
S S£ M 7 
oi: o a ag K 
% S = S 
BS N S oY a0 
s] S Ss a aS 
` N W, ~< e Se 255 
N ` 7 X x SM 
T i = pee ey 
A à 3 $ N 
. è $ S$ 
x = yy X S 
7 Pa S 
ee: ee: 
v J N — sitesi 
NEOCARIDA. PALAOCARIDA. 
CRUSTACEA. 
-ganglio: 
to the tetas oe racic e apod dages sent off from an œsophageal 
ring; nervous system ensheathed by a ventral system of arteries; 
metamorphosis slight. Sexes distinct. 
rder 1. Merostomata—No distinct thoracic segments and ap- 
pendares, cere Eurypterus, etc.) Order 2. Trilobita— 
extinct. 
A farther elaboration of this E See with full references — 
a ` 1Zoölo for Students and General Rea American Science Series. By A. S. 
Packard, Jr. H. =——— New Yorks published in Dec., 1879. 8vo, pP- ee 
