MARINE GAMMARIDEAN AMPHIPODA 511 



12. Gills, with support for cover slip. 



13. Brood lamellae. 



Very frequently, preserved amphipods have broken appendages. 

 Sometimes the loss of uropod 3 is a consistent occurrence especially 

 in gammarids and oedicerotids. So few Gammaridea lack a third 

 uropod that the first assumption always should be that the part has 

 been removed accidently and close examination should be made for 

 sockets and musculature indicating the loss. 



Antennae are often broken and such specimens should be avoided 

 until experience is sufficient to recognize amphipods by other means. 

 In the photid-corophiid complex, legs (except gnathopods) and 

 antennae are frequently autotomized when the animals are preserved, 

 and specialists usually have found other means of identification in 

 those families. 



The ecologist making a study of a single species should be prepared 

 to take special care in preservation of his material to ensure com- 

 pleteness of the specimens. He may find slow dilution of seawater or 

 special anesthetics suitable to kill the organisms slowly and to prevent 

 autotomy. 



