CONTENTS 



PAGE 



I. Introduction 9 



II. Explanation of terms and measurements 13 



III. Systematic discussion of the California representatives of the Order 



Decapoda 18 



Suborder Natantia 18 



Tribe Peneides 19 



Family Sergestidae 19 



Genus Sergestes 19 



Sergestes similis 19 



Sergestes sp 20 



Family Peneidae 20 



Genus Peneus 21 



Peneus brevirostiis 21 



Genus Benthesicymus 22 



Benthesicymus altus 22 



tanneri 23 



Genus Gennadas 23 



Gennadas borealis 24 



pectinatus 25 



Tribe Carides 26 



Family Pasiphaeidae 27 



Genus Pasiphaea 27 



Pasiphaea magna 28 



pacifica 29 



emarginata 30 



corteziana 30 



affinis 31 



Genus Parapasiphae 31 



Parapasiphae serrata 31 



Family Oplophoridae ." 32 



Genus Acanthephyra 32 



Acanthephyra curtirostris 33 



Genus Hymenodora 33 



Hymenodora frontalis 34 



Family Palaemonidae 34 



Genus Palaemon 35 



Palaemon ritteri 35 



Genus Palaemonetes 36 



Palaemonetes hiltoni 36 



Genus Urocaris > 37 



Urocaris infraspinis 37 



Family Pontoniidae 37 



Genus Pontonia 38 



Pontonia californiensis 38 



Genus Periclimenes 39 



Periclimenes tenuipes 39 



