190 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



dent that there is no effective barrier to distribution in the whole Eastern 

 Pacific considered, and that during certain periods in the past, there was 

 no such barrier between the Eastern Pacific and the Gulf of Mexico and 

 the Caribbean Sea. 



A crosscheck table, Table II, which gives the number of species 

 restricted to each section, as well as the number in common with each 

 section and each other section, demonstrates this definitely. 



Table II 



OC Peru Ec Col Pan Ca Mex GofC WLC SC NEP NWA 



OC 17 12 25 20 33 13 39 40 43 47 40 56 



Of the 127 species from the Eastern Pacific north of Point Concep- 

 tion, 3 have not been obtained farther south, 4 have been obtained as well 

 in the Atlantic but not farther south in the Pacific. The southern limit 

 for the remaining 120 species is indicated in Table III, where the first 

 line gives the number of species in each section where the species has not 

 been reported from the oceanic area, and the second line when the species 

 has been reported from the oceanic area as well. 



Table III 



SC WLC GofC Mex CA Pan Col Ec Peru OC{A\one) 



1. 30 23 8 4 3 3 4 4 2 2 



2. 3164-627 10- 



Of the 129 Hancock species that have appeared in the northwest At- 

 lantic as well, 61 have extended northward into NEP, 19 to SC, 12 to 



