Cumacea 



vably articulated segments, of which the first five may carry 

 each a pair of pleopo|ds, and the sixth is always furnished with 

 a pair of uropods, while the seventh, the telson, never has appeu- 



Antenna i 



Peraeopod i 



Branchial apparatus . 

 exopodal part 



Peraeopod 2 



Branchial apparatus 

 epipodal part 



Nerve chain 

 Peraeopod 3 



Peraeopod i 



Incubatory plate 

 (in formation) 



Peraeopod 



Eyelobe 

 Cephalic ganglion 



Mandible 



Pleon segment i 



Stomach 

 Carapace 



, 3 liversacs 



Heart 

 ~ Renal organ 



- Ovary 



Intestinal canal 



Fig. 2. 

 Diastylis lucifer (after G. 0. Sars), 



dages. Internally, the heart (so far as known) within a narrow 

 pericardial sinus has three pairs of lateral openings, is fusiform, 

 and does not extend beyond the peraeon segments; a short dilated 

 one-chambered stomach is followed by along, generally straight. 



