CHAPTER VI 



CRUSTACEA (CONTINUED*) EUMALACOSTRACA (CONTINUE!)} 



EUCARIDA EUPHAUSIACEA COMPOUND EYES DECAPODA 



DIVISION 4. EUCABIDA. 



THE carapace fuses with all the thoracic segments. The eyes 

 are pedunculate. The mandible is without a lacinia mobilis. 

 There arc, no oostegites, the eggs being attached to the enclo- 

 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. 



agree 



Euphausiacea. 



with the Decapoda in passing 



A.I 



Ab.G. 



Order I. 



The Euphausiidae ' 



through a complicated larval metamorphosis. The young hatch 



out as Nauplii, 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 



Fie. 101. (.'alyptopis larva <>| Kn/i/ii/its/ /it'll n<-ni<i, x jibout the Zoaea of the 

 .(./1st antenna ; Abii 6th abdominal segment ; D ecapO( l a tW pairs 

 h, rye ; M, inaxillipcde. (After Sars.) 



of maxillae and ;i 



pair of hirainous maxillipedes are added; the hinder thoracic 

 segments are imdifferentiated, but the abdomen is fully segmented, 



1 Sars, (.'ImUi'iiiirr Reports, xiii.. 1885 ; Chun, Kiblinllit'ca Zoologica, xix., 1896, p. 139. 



144 



