82 MATTOX 



Holothuroidea 



Cucmnaria piperata Stimpson Stichopus johnsoni Theel — C 



Leptosynapta sp. Stichopus parvimensis H. L. Clark 



Pentamera populifera (Stimpson) — C 



Crinoidea 



Floremetra perplexa A. H, Clark — C 

 Chordata 

 Fishes 



Cephaloscyllium uter (Jordan Icelinus tenuis Gilbert 



& Gilbert) Odontopyxis trispinosa Lockington 



Coryphopterus nicholsi (Bean) Oxyjulis califoniica (Giinther) 



Cryptotrema corallinum Gilbert Porichthys notatus Girard 



Hippoglossina stomata Sebastodes pinniger (Gill) 



Eigenmann & Eigenmann Sebastodes semicinctus Gilbert 



Icelinus cavifrons Gilbert Zaniolepis frenata Eigenmann 



Icelinus fimbriatus Gilbert 

 Icelinus quadriseriatus 

 (Lockington) 



The writer here wishes to acknowledge the assistance of the follow- 

 ing persons in the identification of some of the animals listed here : Dr. 

 John S. Garth, the Decapoda; Dr. Olga Hartman, the Annelida; Miss 

 Janet Haig, the Decapoda and fishes; Mr. Fred C. Ziesenhenne, the 

 Echinodermata. 



An examination of the two lists given here readily indicates the great 

 diversity of forms encountered in the area under study. It is hoped that 

 their presentation will aid in a better understanding of the animal asso- 

 ciates of living brachiopods. It is seen that the polychaetous annelids are 

 the most diverse and numerous of all the groups represented. The mol- 

 lusks and echinoderms are the next most conspicuous groups. In different 

 dredge hauls different types of animals were conspicuous, such as sea 

 pens, brittle stars, gastropods, and other mollusks. In some samples the 

 sea urchin, Lytechinus anamesus, was taken by the hundreds and was by 

 far the most conspicuous animal. It is probable that this area does not 

 represent a unified community, but rather there are different associations 

 dominated by different forms such as the sea pens, sea urchins, and brittle 

 stars. The brachiopods are one of several forms that seem to be distributed 

 over these various associations. No single group or type of animal may be 

 indicated as a true dominant over the entire area. Some few may be com- 

 petitors for space and some of the carnivorous species may exert a minor 

 influence on the numbers of others. There is no form that has definitely 

 been shown to influence the brachiopod population to a marked degree. 

 It is possible that such carnivorous forms as the rather common Philine 

 and other opisthobranchs may utilize the brachiopods as an item in their 

 diet. The brachiopods, being sessile, would be easy prey for these snails ; 



