46 THE NAUTILUS. 



FAMILY CHAMID.E. 



Not represented in tlie V. B. excepting as fossils, 



fa:mily hippurttid^. 



(Order Rudistes, Lam.) 

 All the genera and species of this family are extinct. 



FAMILY MEGALODONTID^. 



All fossil. 



FAMILY TRIDACNID.E. 



None in America. 



(To be conthmed.) 



GENERAL NOTES, 



Bythixia textaculata, Lixx, IX Ohio. — Recently while col- 

 lecting on Lake Erie, near Ashtabula Harbor, O., I found high up 

 on the beach among the drift material, specimens of above named 

 species. They were larger than those usually sent from Europe. 

 Although the animals were dead the opercula were in place and 

 the shells were free from wave and sand abrasion. Evidently they 

 were cast up by a heavy sea. As this is an introduced species it is 

 of general interest to learn when and where it was first introduced, 

 the localities where it now abounds, and any facts relative to its 

 natural distril)ution. — Geo. J. Streator, GarrettsviUe, 0. 



jMr. S. Raymoxd Roberts, Treasurer of the Conchological Sec- 

 tion of the Academy of Natural Sciences of Philadelphia, and 

 author of various papers on the Cyprceidce, has removed to New 

 York City. 



Mr. F. C. Baker, formerly of Providence, R. I., is pursuing his 

 studies at the Academy of Natural Sciences of Philadelphia. 



ZoxiTES LIGERUS var. Stoxei. — From Mr. Witmer Stone I have 

 received a form of Z. Ugerua differing from the type in having a 

 concave, broadly excavated base, with comparatively wide um- 

 bilicus, collected by him in New Castle Co., Del. The axis in 

 the type is barely perforated ; but in this form it is a millimeter or 

 juore wide, and the base around it broadly concave. — P'dsbry. 



