81 



Without exception, all have been taken off the CaHfornia coast, most 

 do not occur south of San Diego on the outer Pacific coast, and all are 

 continental shelf species, seldom found living in depths of more than 

 180 meters. The stations which were held in close association by this 

 peculiar assemblage of dead shells by computer analysis are located on 

 fig. 26. The list of so-called "California shelf" species, and the number of 

 station occurrences within the matrix stations is given below. The signi- 

 ficance of this assemblage is discussed further on pages (123-125). 



Gastropods 



Calliostoma gemmulatum 1 stat. 



Calliostoma variegatum 2 stat. 



Margarites albolineatus 1 stat. 



Turcica caffea 2 stat. 



Turritella, sp. 6 stat. 



Pterynotus carpenteri 1 stat. 



Boreotrophon, sp. 3 stat. 



Nassarius miser 5 stat. 



Fusinus barbarensis 1 stat. 



Antiplanes abarbarea 1 stat. 



Lamellibranchs 



Acila castrensis 5 stat. 



Nuculana taphria 4 stat. 



Nuculana hamata 6 stat. 



Yoldia martyr ia 1 stat. 



Glycymeris corteziana 2 stat. 



Cyclopecten vancouverensis 2 stat. 



Cardita barbarensis 8 stat. 



Dimya californiana 1 stat. 



Lucina tenuisculpta 6 stat. 



Lucinoma annulata 6 stat. 



Tellina carpenteri 4 stat. 



Tellina bodegensis 2 stat. 



Macoma planuiscula 3 stat. 



Hiatella arctica 5 stat. 



A few of the typical living and dead species of mollusks are shown on 

 Plate VII. Many more are illustrated in Keen (1958) and Oldroyd 

 (1925-1927). 



IX. Upper slope, central and southern Gulf, 121 to 730 meters. 

 The depths of between 121 and 730 meters south of the islands separating 

 the Gulf provide a slightly different fauna from the northern basins, 

 especially in the number of living invertebrate species. Much of this 

 difference can be attributed to sampling technique, however. Twenty-four 

 species were found to be common to both the northern and southern Gulf, 

 and 31 species were collected alive from 14 stations located on fig. 26. 



6 Vidensk. Medd. fra Dansk naturh. Foren. Bd. 126. 



