232 University of California Publications in Zoology — [Vou. 14 
Paphia staminea Saxicava pholadis 
Paphia tenerrima Schizothaerus nuttalli 
Petricola carditoides Siliqua nuttalli 
Phacoides annulatus Tegula funebrale 
Phacoides tenuisculptus Tellina salmonea 
Pholadidea penita Thais lamellosa 
Pholadidea ovoidea Thyasria gouldi 
Polinices lewisi Trachydermon raymondi 
Psephidia ovalis Turris incisa 
Saxidomus nuttalli Yoldia encifera 
Saxicava arctica Zirfaea gabbi 
PREDOMINANTLY SOUTHWARD RANGING SPECIES TAKE BY THE ‘‘ ALBATROSS’’ 
Acteocina cerealis Leda taphria 
Actaeon punctocoelatus Leda hamata 
Anomia peruviana Modiolus politus 
Barleeia subtenuis Modiolus rectus 
Bathytoma carpenteriana Nassa perpinguis 
Bittium subplanatum Olivella intorta 
Cancellaria crawfordiana Pecten latiauritus 
Epitonium hindsi Polinices draconis 
Epitonium sawinae Turbonilla keepi 
Lasea rubra Volvula eylindrica 
Lacuna unifasciata Yoldia cooperi 
If such a list be compared with the list of prevalent species of the 
outside fauna (table 5) it is found that 46 per cent of the prevalent 
species are predominantly southward ranging, whereas only 39 per 
cent are northward ranging. 
TABLE 5 
PREVALENT SPECIES IN THE OUTSIDE FauNA 
Bathytoma carpenteriana Olivella intorta 
Columbella gausapata Olivella pedroana 
Epitonium sawinae Pandora filosa 
Leda taphria Phacoides tenuisculptus 
Mangilia angulata Siliqua nuttalli 
Nassa perpinguis Tellina salmonea 
This high percentage of southern forms occurring in the outside 
fauna is significant and may be emphasized in another way. Of the 
22 predominately southward ranging species taken by the Survey, 10 
or 45 per cent are restricted in their known local distribution to the 
open ocean. Four others were rarely taken within the bay. Thus 
nearly 60 per cent of the predominately southward ranging species 
taken by the Survey are either restricted to or occur almost exelu- 
sively in the waters outside the Golden Gate. It is also found that 
