40 THE NAUTILUS. 



was 110,000 bushels, valued at $4,400, while the catch in 1889, up 

 to and including the 19th of June, was 75,000 bushels, valued at 

 $3,000." 



The marvellous abundance in certain localities of the various spe- 

 cies above named, is, aside from the economic value of the fishery, 

 of exceeding interest to the naturalist. What proportion of the 

 total quantity, 315,000 bushels of jingles and quarter-decks, belong 

 to the latter species, Crepidula, is not stated ; probably much less 

 than half, and quite likely not more than a quarter; presumably 

 the quarter-decks are attached to, or are adherent upon, the jingle 

 or Anomia shells, domiciliares upon the valves of the latter species, 

 the same as the West American species. 



Crepidula rugosa is a domiciliare on the shells of Pecten cequisul- 

 catus Cpr., the Californian analogue of P. irradians. It is not at 

 all infrequent to find from three to six individuals of the West 

 Coast Crepidula on a single specimen of the Pecten. 



Beside the use of oyster, clam, scallop, quarter-deck and jingle 

 shells for forming spawning-beds, the oystermen in some instances 

 and in some places, are utilizing old tin cans as catchment objects 

 for the spat to fasten upon. AVhat with the packing of adult oysters 

 at the canneries and the entrapping of the innocent unsophisticated 

 fry on old tin pots and cans, the situation may be said to look to an 

 old man in a balloon, or a young man " up a tall tree," like can- 

 ning the oysters at both ends. 



Los Angeles, Cal., June, 1897. 



NEW UNIOS. 



BY BERLIN H. WRIGHT. 



Unio Pinei sp. nov. 



Shell wide or oblong, moderately and uniformly thin, dorsal and 

 ventral margins usually parallel, subtruncate or obliquely rounded 

 before, biangular and truncated behind. Epidermis reddish-brown ; 

 olive above, polished and thickly covered with unequal rays. Beaks 

 scarely elevated above the dorsum, and surrounded by four or five 

 fine concentric, undulating ridges. Ligament thin, reddish, long 

 and depressed. Greatest diameter in the centre of the shell. Beak 

 cavities slight. Cavity of the valves ample and tray-shaped. Nacre 



