106 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 27 



These 17 samples have 60 specimens, with 6 samples lacking amphi- 

 pods, probably because some are very near sill depths of San Pedro and 

 Santa Monica basins (737 m). Ampelisca macrocephala unsocalae domi- 

 nates the group. Species that are much deeper than their normal limits 

 are A. compressa, of doubtful identification, Proboloides tunda and a 

 deep water species that is near its shallow limits: Ampelisca romigi ciego. 



Ampelisca coeca, 1 

 Ampelisca macrocephala, 1 

 Ampelisca macrocephala 



unsocalae, 4 

 Bathymedon kassites, 7 

 Byblis barbarensis, 4 

 Byblis veleronis, 1 

 Harpiniopsis emeryi, 1 

 Harpiniopsis epistomata, 16 



701-800 m 



Harpiniopsis fulgens, 5 

 Heterophoxus oculatus, 4 

 Listriella albina, 1 

 Monoculodes norvegicus, 1 

 Orchomene decipiens, 1 

 Paraphoxus daboius, 1 

 Paraphoxus oculatus, 1 

 Protomedeia articulata, 111 



The 13 samples have 160 specimens; 5 samples lacked amphipods. 

 This group of samples is dominated by the single Monterey Canyon 

 station 6494 where 111 Protomedeia articulata were collected on a bot- 

 tom heavy with eel-grass debris. Since that situation is not typical of 

 canyons in southern California, additional calculations have been made 

 in the tables in these depths to reflect the unusual population of Proto- 

 medeia. Otherwise, Harpiniopsis epistomata dominates the amphipods. 

 Transition to deep bathyal is seen with the co-occurrence of Ampelisca 

 macrocephala and its blind subspecies A, m. unsocalae, by the combina- 

 tion of Byblis barbarensis with B. veleronis, and the mixture of Orcho- 

 mene decipiens and Paraphoxus daboius with other much deeper species 

 such as Ampelisca coeca. 



801-1000 m 



Harpiniopsis profundis, 1 

 Heterophoxus oculatus, 1 

 Liljeborgia cota, 1 

 Oediceropsis morosa, 1 

 Paraphoxus daboius, 9 



Ampelisca macrocephala 



unsocalae, 14 

 Ampelisca plumosa, 2 

 Ampelisca romigi ciego, 2 

 Byblis bathyalis, 2 

 Byblis cf. barbarensis, 1 

 Byblis tannerensis, 3 

 Harpiniopsis emeryi, 2 

 Harpiniopsis epistomata, 4 

 Harpiniopsis excavata, 1 

 Harpiniopsis naiadis, 2 



Paraphoxus oculatus, 1 

 Protomedeia articulata, 20 

 Schisturella zopa, 3 

 Tosilus arroyo, 1 

 Urothoe varvarini, 3 



