EXPLANATION OF PLATE XIX. 



Tritia trivittatoides Whitf. (p. 104). 



Figs. 1, 2. Enlarged views of two different specimens; one without the varix, the other having it. 



3. Surface still further enlarged. 



Tritia trivattatoidks var. elongata (p. 105). 



Figs. 4, 5. Two views of a specimen. The figures are too broad in proportion to their length. 



6. View of another specimen, showing more nearlv the true proportions, enlarged. 



Tritia bidentata Emmons sp. (p. 106). 



Fig. 7. Enlarged view of a large individual of the species. 



Oliva Carolinensis Conrad (p. 109). 



Fig. 8. Copy of Mr. Conrad's figure from the American Journal of Science and Arts, vol. 41, 



1st ser., PI. ii, fig 1. 



Erato Emmoxsi Whitf. (p. 108). 



Figs. 9, 10, 11. Three views of the only perfect specimen found, enlarged. 



Amycia communis Conrad (p. 110). 



Figs. 12, 13. Two views of one of the larger specimens, enlarged. 



14, 15: Similar views of another individual which shows color lines on part of the shell. 



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