ACADEMY OF SCIENCES. ye 
IV, 173, is quite distinct, and inhabits the outlet of the same creek abundantly, 
14 mile lower down. They must be distinguished as follows: 
A. Californica Cooper (Tryon in part?). Dark horn-brown, shining, 
acute, whorls rapidly increasing, and flattened on spire, a slight parietal callus, 
not connecting lips. Animal whitish, tentacles and muzzle tinged black, a 
rufous patch on top of head, its foot ovate, twice as long as shell; tentacles 
oculiferous, two. 
HA. Californica Tryon (emend., figure and part of description). Shell 
nearly white, translucent, rough, rather obtuse, whorls slowly increasing, and 
very convex, mouth suboyate, lip nearly continuous, leaving a slight notch in 
umbilical region. Animal white, top of head and tentacles (four) yellowish, 
a black jaw (?), visible in proboscis. which is very extensible; foot with 
pointed lateral lobes in front spreading sideways, tapering to a long acute 
point behind, tentacles long and sharp, the eyes at their base; foot 174 times 
the length of shell—proboscis half its length, tentacles about as long. 
The animal of Hydrobia is much more active than that of the former, and 
easily observed in a bottle of water taken from its peculiar station. 
Reeutar Meretine, Fresruary 15ru, 1875. 
The President and Vice-Presidents being absent, Mr. Stearns 
was called to the chair. 
Eighteen members present. 
Donations to the Museum: From Mrs. F. F. Victor a collec- 
tion of shells from Modoe Lake, on the northern border of Cali- 
fornia. Henry Hemphill donated sundry reptiles and crusta- 
ceacez, (not identified); from W. Russel a mole-cricket; from Dr. 
Kellogg a specimen of Pinus muricata from Santa Cruz, illustrat- 
ing the enlarged umbos when much exposed to the winds of the 
coast, also cones of Pinus monophylla, one of the most nutritive 
and delicious of all the pifiones. From F. Gruber, the follow- 
ing birds: Perdix cinerea, or Kuropean Field Partridge; Ampelis 
garrulus, or wax wing; Alauda brachydactyla, or Crossbill; Fring- 
illa Coccothraustes, or Grosbeak; Oriolus galba, or Golden 
Oriole. 
The Secretary read a paper from Professor George Davidson, 
as follows: 
