Plate XXXVII. The plankton communities with the two species of Sngitta shown in Plate 



XXXVI. 

 {Top) Sagitta sctosii with plankton of poor feeding value; also seen are the medusa Aghiiitlia, a 



larval hermit crab, an aniphipod and one fish egg (left). 

 (Bottom) Sagitta elcgans with plankton of rich feeding value. There are many copepods— chiefly 

 Calams — euphausids, a shrimp, crab larvae, medusae, Oikoplcma and young fish — chiefly lemon 



sole and witch. 



Photographs by James Fraser 



