. Mesozoic fossils. - distinguished from the Pernamytiloides as figured by Mr. Damon and the late Professor Phillips,he is by no means convinced that they belong to that species. TheLamarckian definition of P. mytiloides (• P. testa ovato-oblonga, depressa,basi acuta; cardine obliqua) is altogether insufticient tor the discrimi-nation of closely related forms. The generic name Melina of Rotzius has prioi-ity over Perna, Bru-guiere. Syncyclonema Meekiana. (N. sp.)Fig. Fifi. 9.—Syncyclonema Meekiana.—Outline of an immature but nearly perfect ex-ample, with a portion of the test of another sp
. Mesozoic fossils. - distinguished from the Pernamytiloides as figured by Mr. Damon and the late Professor Phillips,he is by no means convinced that they belong to that species. TheLamarckian definition of P. mytiloides (• P. testa ovato-oblonga, depressa,basi acuta; cardine obliqua) is altogether insufticient tor the discrimi-nation of closely related forms. The generic name Melina of Rotzius has prioi-ity over Perna, Bru-guiere. Syncyclonema Meekiana. (N. sp.)Fig. Fifi. 9.—Syncyclonema Meekiana.—Outline of an immature but nearly perfect ex-ample, with a portion of the test of another specimen magnified to show the details ofthe sculpture The engraver has not made the tubercles which result from thecrossing of the ribs sufficiently distinct. Shell small, compressed, thin ; subovate when half giown, but nearlyorbicular when adult; often triangular above the middle. The ears areimperfect in all the specimens ; l»ut in the upper valve they ai)pearto have been horizontal above and almost vertical at the sides; thoseof the lower valve are unknown. The surface of the main body of the shell is marked b}very numerous^fine and closely-arranged, i-ounded concentric ribs, which are crossed byexactly similar radiating costa3. The points at which the radiating ribspass over the concentric ones are marked by small rounded elevations ortubercles, which give a nodose appearance to the sculpture, but whichare too small to be visible to the naked eye. The wo
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Keywords: ., bookcentur, bookdecade1870, booksubjectpaleontology, bookyear1876
