THE NAUTILUS. 21 



Paphia tenerrima Carpenter. 12 fathoms ; immature valves only. 



Venerupis lamellifera Conrad. Some very pretty specimens of 

 this species were found from the shore line down to 12 fathoms. 



Psephidea ovalis Dall. 12 fathoms. 



Petricola carditoides Conrad. 12 fathoms; in the blue clay. 



Petricola californica Conrad. 25 fathoms ; valves only. 



Psammobia californica Conrad. Low-tide to 12 fathoms; not 

 common. 



Tellina salmonea Carpenter. 40 fathoms ; rare. 



Macoma yoldiformis Carpenter. 40 fathoms ; off Moss Landing. 

 One specimen. 



Sernele rubropicta Dall. 25 fathoms ; valves only. 



Semele pulchra Sowerby . 1 2 fathoms ; valves only. 



Cumingia californica Conrad. Not uncommon at low-tide. 



Cooper ella scintilliformis Carpenter. 40 fathoms ; one live but 

 immature specimen. 



Sphenia californica Conrad. Low-tide to 15 fathoms ; not rare. 



Corbula luteola Cpr. 15 fathoms. 



Saxicava arctica Linne. Low-tide to 12 fathoms. 



Saxicava pholadis Linne. Low-tide to 12 fathoms. Several very 

 large specimens were found in the abandoned holes of borers. 



Siliqua lucida Conrad. Living; 15 fathoms; rare. 



Solen sicarius Gould. Living ; 40 fathoms. 



Spisula planulata Conrad. Very common at about 12 fathoms' 

 depth. 



Spisula catilliformis Conr. One valve only ; 40 fathoms ; off 

 Moss Landing. 



Lyonsia nitida Conrad. 12 fathoms ; rare. 



Lyonsia spongiophila Dall. Low-tide to 12 fathoms; quite rare. 



Mytilimeria nuttalli Conrad. Found at low-tide curiously embedded 

 in sponges or colonies of ascidians. The live animals would be passed 

 over and found rarely, except by accident, were it not for the distor- 

 tion in the masses of their hosts caused by their presence, or for the 

 oddly-shaped openings which permit the sea water to reach them. 



Entodesma saxicola Baird. Among the rocks at low-tide. 



Parapholas californicus Conrad. 12 fathoms. At this depth the 

 dredge often brought up large fragments of a hard, blue clay which, 

 upon examination, was found to be filled with dead and living spe- 

 cimens of this and other boring mollusks, such as Petricola, Adula, 



