CONTENTS 



Introduction ' 



Georges Bank — description of environment 1 



Georges Bank— Amphipoda • 



Methods ' 



Annotated list of species 2 



Discussion ^ 



Zoogeography ^ 



Species distribution patterns ^ 



Northeast Peak ^ 



Perimeter ° 



Western Basin ^ 



Shoals 8 



Southern Edge 8 



Central 8 



Acknowledgments ° 



Literature cited 8 



Table 



1 . Six patterns of gammaridean distribution on Georges Bank 7 



Figures 



1 . Geographical features and bathymetry of Georges Bank 10 



2. Geographic distribution of bottom sediment types and station locations on Georges Bank 11 



3. Distribution of average bottom-water temperatures during February and September on Georges Bank 12 



Geographic distribution of species of gammaridean Amphipoda on Georges Bank: 



4. Acanthohauslorius intermedius, A. spinosus, A. similis, A. sp. C, A. sp. D, Acanthonotozoma serratum, Anda- 

 niopsis nordlandica, A mpelisca agassizi 13 



5. A mpelisca decliviiatis, A. macrocephala, A. vadorum, Amphilochoides odontyx, Amphiporeia giganlea, A. vir- 

 giniana, Amphithoe rubricata, Anonyx debruyni, A. sarsi, A. liljeborgi j 14 



6. Argissa hamatipes, Bathymedon sausserei, Balhyporeia quoddyensis, Sybils gaimardi, B. serrata, Calliopius lae- 

 viusculus, Casco bigelowi, Corophiuin crassicorne 15 



7. Dulichia tuberculata, Dyopedos arclicus, D. monacantha, Epiineria loricala, Ericthonius rubricornis, Eriopisa 

 elongata, Eusirus cuspidal us, Ganunaropsis maculatus, Cammarus annulalus 16 



8. Gilanopsis arctica, Halice abyssi, Halirages fulvocinclus, Haliragoides inennis, Haploops lubicola, Harpinia pro- 

 pinqua, Hippomedon propinquus 17 



9. Hippomedon serralus, Ischyrocerus anguipes, I. megacheir, Leplocheirus pinguis, Melita dentata, Maera danae, 

 Melita sp. A, M. sp. B, Melphidippa goesi 18 



10. Monoculodes edwardsi, M. inlermedius, M. latimanus, Monoculopsis longicornis, Neopleustes pulchellus, Orcho- 

 mene mmuta, O. pinguis, Paradulichia typica 19 



1 1 . Parahaustorius attenualus, P. holmesi, P. longimerus, Paraphoxus epistomus, Pardalisca cuspidata, Photis den- 

 tata, P. macrocoxa, Phoxocephalus holbolli 20 



12. Platylshnopus sp. A, Pleusymles glaber, Pleustes panoplus, Podoceropsis nilida, Pontogeneia Inermis, 

 Protohaustorius deichmannae, P. wigleyl 21 



13. Protomedela fasciata, Psammonyx nobilis, Pseudohaustorius borealls, Pseudunciola obliquua, Rhacholropis 

 disllncla, R. inflata, R. oculata 22 



14. Siplwnoecetes smithianus, Stegocephalus inflatus, Slenopleustes gracilis, S. inermis, Stenothoe minuta, Stenula 

 peltata, Synchelidium americanum, Syrrhoe crenulata, Tiron spiniferum 23 



15. Tmetonyx cicada, Tryphosella nanoides, Unciola dissimilis, U. inermis, U. irrorata, U. spicata, Westwoodilla 

 megalops 24 



16. Most common distribution patterns of gammarideans on Georges Bank 25 



