BULLETIN OF THE UNITED STATES FISH COMMISSION. 357 



undoubtedly was accidentally and incidentally introduced to the w< 

 coast. 



In 1881 Dr. Anderson, of Santa Cruz (a1 the head of Monterey Bay), 

 sent me specimens from said locality, where he found them at the mouth 

 of a lagoon. These were rather under size. It [Mya) was quite likely 

 placed at this last station by sonic of the "shell-fish" dealers of Santa 

 Cruz. An examination of many of the mounds and shell heaps (kitchen- 

 middens) on the shores of San Francisco Bay and the adjacent region, 

 has as yet tailed to reveal a fragment of the shells of .Mya arenaria, though 

 the remains of Tapes (Cuneus), Macoma, Mytilus, Cardinal, &c., are abun- 

 dant, common, or occasional, in proportions which may be intoned from 

 the order in which 1 have placed them above. 



National Museum, 



Washington, I). C, February 7, 1885. 



120.— IHEITIOKAIVDi;;?! OIV WATER RESIDUES IKOII ( OIMIAK line 



STATION AT WOOD'S HOLIi. 



By Dr. J. II. KIDDER. 



•The residues were received December 5, 1884. 



A. "From receiving-tank in hatching-room," about 1 liter of water, 

 copious black, ropy, and flocculent residue; supernatant liquid, yellowish 

 milky. Mixture has decomposed by standing, with development of a 

 bulky black fungus. No sulphnreted hydrogen. 



B. "From one of the apparatuses in which eggs are placed" about 4 

 ounces heavy reddish-yellow sediment; supernatant liquid, clear. 



Partial analysis of the dried residue results as follows: 



l'c r cent. 



A. Blackens on ignition (organic and volatile matters) and 



loses 17. 74 



Incombustible residue (red powder) 82. 26 



Total 100."" 



B. Blackens on ignition and loses 24.214 



Incombustible residue (red powder) 75.786 



Total 100.000 



The loss on ignition is mostly organic matter. 



Of inorganic constituents there have been detected: Chlorine, sul- 

 phuric acid, calcium, magnesium, silica, alumina (day), and sesqnioxide 

 of iron; the last three named constituting the greater part of the incom- 

 bustible residue. 



Smithsonian Institution, 



Washington, D. C, January 1<5, 1886. 



