CHAP. V MALACOSTRACA—LEPTOSTRACA ober 
SERIES 1. LEPTOSTRACA. 
Division. Phyllocarida. 
The small shrimp-like Crustacean Nebalia, which is found 
burrowing in the . 
superficial layers 
of sand in the 
littoral and some- 
times the deeper 
regions of most 
seas, has been re- 
garded, ever since 
its anatomy was 
made out by Claus, 
as a connecting 
link between En- / 
tomostraca and 
Malacostraea, and 
has been placed in 
a separate group 
Leptostraca. 
The segmenta- 
tion of the body 
is Malacostracan, 
save that two extra 
segments are pre- 
sent in the abdo- [o> 
men,and the paired 
compound eyes are 
borne upon stalks. 
The eight thoracic 
limbs are all very 
similar; they are 
built on the typi- 
cal biramous plan, 
and each carries a 
bract; they have l 
been compared, owing to their flattened, expanded shape, to the 
1 Claus, Arb. Inst. Wien, viii., 1889, p. 1. 
1 76.—Nehalia geoffroyi, 
Oe 205 ALLA OF lst 
and 2nd antennae ; Ad. 7, 
Ab.G, 1st and 6th abdo- 
minal appendages ; 4A.G, 
antennary gland; (, half 
of caudal fork ; #, eye; G, 
ventral ganglionic chain ; 
/1, heart ; 7, intestine ; Z, 
upper liver-diverticulum ; 
MW, adductor muscle of 
halves of carapace ; JILY, 
palp of Ist maxilla ; 
O; ovary; R, rostrum. 
(After Claus.) 
