The Horn Shells 



Peculiar in retaining the larval form until quite large, especially 

 when living far from shore. 



T. decorata, C. B. Ads., is white overlaid with checkers of 

 dark brown. The whorls bear three rows of beads with deep 

 channels between. The " lef t-handedness " of this slim little 

 shell makes it noticeable. Length, i to § inch. 



Hahitat. — Florida, West Indies. 



A Californian form of the European T. perversa, Linn., is 

 var. adversa. Its ribbed and beaded, yellowish brown spire 

 coils to the left, distinguishing it from other genera of the horn 

 shells. It is about the same size as T. decorata. 



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