55, 



surface of the large white anemones in Baltiiriore Canyon. 



Two types of associations where organisms attach onto 

 crabs were also noted. A facultative relationship exists 

 between the red crab Geryon quinquedens and a small white 

 barnacle that attached to its carapace and legs. Frequently, 

 individuals of G, quinquedens had as many as 40 of these 

 barnacles attached to them. It is assumed that the barnacles 

 just utilize the crab carapace as a hard substrate, since 

 both organisms can exist without this relationship. The 

 other association, between zoanthids and the hermit crab 

 Parapagurus sp. , is obligatory. The crab needs the zoanthid 

 to provide protection for its soft carapace, much as different 

 species of hermit crabs use discarded gastropod shells. The 

 zoanthid may also benefit by obtaining food scraps from 

 the crab. 



Comparison of towed camera-sled and submersible 



A comparison of the relative efficiency of the two 

 photographic survey techniques used in the study is of 

 particular interest for several reasons. It helps to 

 elucidate the inherent biases of these techniques and thus 

 allows for better determination of the suitable method to 

 use for specific purposes. This is important because of 

 the cost discrepancy between these methods. Also by 

 utilizing the best technique for a particular problem 



