. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Fig. 15. Interior of ventral valve, natural size; shoeing the teeth, the deltidium, and the 16. The upper part of the two valves, connected in their natural relations to each other, the ventral valve below; showing the teeth and sockets, the bases of the crura, and septum of the dorsal 17. Longitudinal section, showing the foramen and deltidium; the cardinal process of the dorsal
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Fig. 15. Interior of ventral valve, natural size; shoeing the teeth, the deltidium, and the 16. The upper part of the two valves, connected in their natural relations to each other, the ventral valve below; showing the teeth and sockets, the bases of the crura, and septum of the dorsal 17. Longitudinal section, showing the foramen and deltidium; the cardinal process of the dorsal valve lying beneath the latter. The crura are first bent downwards, and then recurved into the dorsal valve, continuing in the spire. The descending process *c is united with a similar one from the opposite side, which together form a connecting band between the two spires. In the present state of our knowledge of the structure of these species,I can see nothing to be gained to science by uniting all these different formsunder a single generic term. It is clear that the Genus Retzia must be restricted to one of three verydistinct groups of species here presented; and should it be found
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
