. Mesozoic fossils. e so far backwards as theinner termination of the true pallial sinus. Dimensions of a specimen which is ovately-orbicular in outline:length, forty-two millimetres, height, thirty-seven and a-half mm.:maximum thickness twenty-three. In an ovately subtrigonal cast ofthis species the maximum length and height are each fifty mm., andthe thickness through the closed valves is thirty-five. Bear Skin Bay, Skidegate Inlet: eleven specimens. The very deep double inflection of the pallial border appears to bethe only point wherein this shell differs from the Thetis major ofSowerby. I
. Mesozoic fossils. e so far backwards as theinner termination of the true pallial sinus. Dimensions of a specimen which is ovately-orbicular in outline:length, forty-two millimetres, height, thirty-seven and a-half mm.:maximum thickness twenty-three. In an ovately subtrigonal cast ofthis species the maximum length and height are each fifty mm., andthe thickness through the closed valves is thirty-five. Bear Skin Bay, Skidegate Inlet: eleven specimens. The very deep double inflection of the pallial border appears to bethe only point wherein this shell differs from the Thetis major ofSowerby. In other respects the present species seem to be intermediatebetween the T. minor and the T. major. Some paleontologists, such asF. Ea^mer, E. Forbes, and Mons. Ebray, regard all the nominal spe-cies of Thetis as varieties of one, which Effimer proposes to call , and if this view be adopted, the Thetis above described willof couise rank only as one of the forms of T. Sowerbii. Cyprina occidentalis. (N. Sp.). Fig. 10. Cyprina occidentalis. Outline of a castiof a left valve, 228 Shell (oi* cjist) compressed, the mjiximum thickness being alittle more than half the height; outline transversely subovate : anteriorend short and rather narrowly rounded; posterior end longer and sub-truncated below the middle; supeiior border descending abruptly andconcavely in front of the beaks, sloping gradually and somewhat con-vexly downwards behind; umbones broad and rather prominent, beaksslightly depressed, appressed and directed foj-wards. Surface marking,hinge teeth and muscular impressions unknown. Dimensions: length, ninety-four millimetres; height seventy-fivemm.; maximum thickness, forty-three. South side of Alliford Bay : a single imperfect cast. The specimen is supposed to belong to the genus Cyprina on accountof its strong resemblance to the C. ovata of Meek and Hayden, of whichlatter species large numbers of fine examples, with the test preserved,have recently been co
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Keywords: ., bookcentur, bookdecade1870, booksubjectpaleontology, bookyear1876
