CAPRELLIDAE OF WESTERN NORTH ATLANTIC 



109 



82° 81* 



"Gill" Cruise 3 

 • Phtisica present 

 O Phtisica absent 



33° 



30' 



29' 



27" 



26' 



25* 

 73 



Figure 56. — Distribution of Phtisica marina in plankton samples taken on cruise 3 of the 



M/V Theodore N. Gill. 



peraeopods 1-5 forming or united to well developed side-plates. Pleon consisting 

 usually of 7 free segments, carrying 3 pairs of pleopods and usually 3 pairs, at 

 least 1 pair, of uropods; uropod 1 always with 2 rami. Eyes varying in size and 

 form, 0-4 in number. Hepato-pancreatic tubes 4, rarely 2; rectal glands 2 or 1, 

 sometimes rudimentary. Heart with 3 pairs, rarely 1 pair, of ostia. Nerve-chain 

 with 4 ganglia in pleon-segments 1-4. 



