6 THE NAUTILUS 



Nucula proxima. Common. 



Area incongnia Say. Common. 



Area transversa Say. Common. 



Area pexata Say. Common. 



Ai'ca amerieana Gray. Connnon. 



Area ponderosa Say. Common. 



Pectuneuhis sp. ? Single valve. 



Mytilus exustus L. Common. 



Mytilus hamatus Say. Common. 



Modiola tulipa L. A few small specimens. 



Modiola plieatula Lam. Common. 



Modiola lignea Reeve. Two specimens attached to Gorgonia. 



Dreissensia leucophceata Conr. Common in bracki:>li water. 



Lithophagus appendlculata L. Common burrowing into Coquina. 



Avicula atlantica Lam. Three specimens. 



Avicula radiata Lam. One specimen attached to floating sea- 

 weed. 



Pinna seminiida Lam. Common. 



Pinna rnnrieata L. Common. 



Plieatula ramosa Lam. A few young specimens attached to coral. 



Lima teuera Chemn. One living specimen. 



Pecten dislocata Say. Living examples are rarely found.. 



Anomia ephippium L. Common. 



Ostrea viginica Gmel. 



Ostrea equestris Say. 



Ostrea frons L. One specimen attached to Gorgonia. 



Glottidia antillarum var. pyramidata Stimj) (Lingiila). A speci- 

 men taken near the old light-house is in a private collection. 



WHY DOES PROPHYSAON SHED ITS TAIL1 



BY W. J. RAYMOND. 



While reading the March " Nautilus" my attention was directed 

 to the foot-note on page 126, in which is related iMi-. Hemphill's ex- 

 traordinary experience with a specimen of Prophysaon. I have 

 twice had a similar experience while handling living animals of the 

 same genus, and think it may he of interest to record my observa- 

 tions. 



