CHAPTER VI 
CRUSTACEA (CONTINUED)—EUMALACOSTRACA (CONTINUED) : 
EUCARIDA—-EUPHAUSIACEA—-COMPOUND EYES—-DECAPODA 
DIVISION 4. EUCARIDA. 
THE carapace fuses with all the thoracic segments. The eyes 
are pedunculate. The mandible is without a lacinia mobilis. 
There are no oostegites, the eggs being attached to the endo- 
podites of the pleopods. The hepatic caeca are much ramified, 
the heart is abbreviated and saccular, the spermatozoa are 
spherical with radiating pseudopodia, and development is typically 
attended by a complicated larval metamorphosis. 
Order I. Euphausiacea. 
The Euphausiidae’ agree with the Decapoda in passing 
through a complicated larval metamorphosis. The young hatch 
out as Nauphi, with 
uniramous first an- 
tennae and biram- 
ous second antennae 
and mandibles. In 
the next stage, or 
“Calyptopis” (Fig. 
101), which corre- 
sponds exactly to 
Fic. 101. —Calyptopis larva of Huphausia pellucida, x about the Zoaea of the 
20. A.Z, 1st antenna; Ab.6, 6th abdominal segment; Y])aa ] a= 
A a ee ‘apoda, two pairs 
hE, eye; M, maxillipede. (After Sars.) Decé pee ! 
of maxillae and a 
pair of biramous maxillipedes are added; the hinder thoracic 
segments are undifferentiated, but the abdomen is fully segmented, 
1 Sars, Challenger Reports, xiii., 1885 ; Chun, Bibliotheca Zoologica, xix., 1896, p. 139. 
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