6 THE NAUTILUS 



Nueida p7'oxima. Common. 



Area mcongrua Say. Common. 



Area transversa Say. Common. 



Ai-ca pexata Say. Common. 



Area americana Gray. Common. 



Area ponderosa Say. Common. 



Pectunculus sp. ? Single valve. 



Mytilus exustus L. Common. 



Mytilus hamatus Say. Common. 



Modiola tulipa L. A few small specimens. 



Modiola plicatula Lam. Common. 



Modiola lignea Reeve. Two specimens attached to Gorgonia. 



Dreissensia leueoph(xata Conr. Common in brackish water. 



Lithophagus appendiculata L. Common bnrrowing into Coquina. 



Avicula atlantica Lam. Three specimens. 



Avicula radiata Lam. One specimen attached to floating sea- 

 weed. 



Pinna seminuda Lauj. Common. 



Pinna muricata L. Common. 



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



Lima tenera Chemn. One living specimen. 



Peeten dislocata Say. Living examples are rarely found. 



Anomia ephippium L. Common. 



Ostrea viginica Gmei. 



Ostrea equestris Say. 



Ostrea frons L. One specimen attached to Gorgonia. 



Glottidia antillarwn var. pyramidata Stimp (Lingula). A speci- 

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



WHY DOES PROPHYSAON SHED ITS TAIL T 



BY W. J. RAYMOND. 



While reading the INIarch " Nautilus" my attention was directed 

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

 traordinary exi)ei'ience with a specimen of Prophysaon. I have 

 twice had a similar experience while handling living animals of the 

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

 tions. 



