 | Charles Doolittle Walcott - 1884 - 444 páginas
...Genus STREBLOPTERIA McCoy. Streblopterla similis, n. sp. Plate viii, figs. 4, in-./, and plate six, fig. 7. Shell of medium size; outline, exclusive of...of two examples, 3.75cm and 1.75cm; breadth, 3.25CIn and 1.5om; convexity of larger, 4mm; of smaller, about 2mm. to Streblopteria lcevigata McCoy (Brit.... | |
 | Luther Crocker Snider - 1915 - 162 páginas
...slope. Hinge-line very short. Beaks small, the sides sloping away at an angle of about 80 degrees. Surface of the larger shells smooth or with fine concentric...two examples, 3.75 cm. and 1.75 cm; breadth, 3.25 cm. and 1.5 cm.; convexity of larger, 4 mm.; of smaller about 2 mm. The peculiar obliquity of the valves,... | |
 | 1915 - 160 páginas
...slope. Hinge-line very short. Beaks small, the sides sloping away at an angle of about 80 degrees. Surface of the larger shells smooth or with fine concentric...two examples, 3.75 cm. and 1.75 cm; breadth, 3.25 cm. and 1.5 cm. ; convexity of larger, 4 mm. ; of smaller about 2 mm. The peculiar obliquity of the... | |
 | Luther Crocker Snider - 1915 - 162 páginas
...marked by concentric lines of growth and rather strong radiating costae ; on the left valve the anteTior ear has only the concentric striae. On all the smaller...two examples, 3.75 cm. and 1.75 cm; breadth, 3.25 cm. and 1.5 cm. ; convexity of larger, 4 mm. ; of smaller about 2 mm. 114 ear of the right valve, and... | |
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... sinus beneath the ear, the ear joining the body of the shell higher up towards the beak. The posterior ear is either very short and small, or obsolete, being merged into the flattened posterior umbonal slope. Hinge-line very short. Beaks small, the... 