How to Know American Seashells 



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Figure 22. Various shapes of gastropods, a, globose {Lunaiia heros Say); b, cap- 

 shaped (Acjnaea testitdinalis Miiller); c, fusiform and with an anal notch on the 

 outer lip {Cerodrillia acestra Dall); d, sinistral or left-handed (A?itiplanes vinosa 

 Dall); e, slipper-shaped (Crepidiila fomicata Linne); f, high-spired (Terebra 

 nassida Dall); g, low-spired (Architectojiica peracuta Dall); h, cone-shaped 

 (Conus) ; i, whorls freely coiled ( Vermicidaria spirata Philippi) ; j, spinose {Murex 

 hystricimis Dall); k, spindle-shaped (FiisiJius eucosinms Dall). 



