. Carnegie Institution of Washington publication. , PHOCID^E, MUSTELID^, PROCYONID^, AND URSID^J. 251 obtuse bisectrix (text figure 259). Looking along a the biaxial figure is seen with moder- ately separated brushes, and the axial angle 2Er=37° to 40° as measured in white light (nearly monochromatic and red owing to the color of the crystal). The axis of greatest elasticity is, therefore, the acute bisectrix Bxa = a, and the optical character is negative. The trillings of the oxyhemoglobin and CO-hemoglobin of the Cali- fornia sea-lion noted above are apparently perfectly conformable
. Carnegie Institution of Washington publication. , PHOCID^E, MUSTELID^, PROCYONID^, AND URSID^J. 251 obtuse bisectrix (text figure 259). Looking along a the biaxial figure is seen with moder- ately separated brushes, and the axial angle 2Er=37° to 40° as measured in white light (nearly monochromatic and red owing to the color of the crystal). The axis of greatest elasticity is, therefore, the acute bisectrix Bxa = a, and the optical character is negative. The trillings of the oxyhemoglobin and CO-hemoglobin of the Cali- fornia sea-lion noted above are apparently perfectly conformable with trillings observed in different species of the Ursidce (page 259). In the case of the California sea-lion, however, the axis of the trilling was taken as the crystallographic axis a; in the case of the Ursidce as the axis c. In order better to compare the oxyhemoglobin and the CO-hemoglobin in the Otari- idce and the Ursidce the crystals of the sea-lion were recalculated, regarding the trilling axis as 6, as follows: Oxyhemoglobin of Otaria gillespii. Monoclinic sphenoidal (tartaric acid type): Axial ratio a : b : c = : 1 : ; /3=74°. Forms observed: Unit pyramid (Til); unit prism (1TO); orthopinacoid (100); clino- dome (Oil); base (001). Angles: Traces of unit pyramid on orthopinacoid, edges llT-100ATll-100 = 103° 30'; opposite pole traces of clinodome on orthopinacoid edges OTl-100 A 011-100 = 103° 30'. Angle of prism 1TO A TTO=60° from twins. Orthopinacoid to base 100 A001 =74°. In this orientation the habit is tabular on the orthopinacoid elongated on the ortho- axis (text figure 261), instead of being tabular on the base, as in the original orientation. The orientation of the elasticity axes is a = (! very nearly; b=b; c A a = 16° 30', in the obtuse angle; the axis c is nearly or quite normal to the orthopinacoid. The plane of the optic axes is the clinopinacoid 010, Bxa = a, and the optical character is negative. The axial angle 2£=35° to 40°.
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