46 THE NAUTILUS. 
FAMILY CHAMID. 
Not represented in the U. S. excepting as fossils. 
FAMILY HiPPURITID A: 
(Order Rudistes, Lam.) 
All the genera and species of this family are extinct. 
FAMILY MEGALODONTID~. 
All fossil. i 
FAMILY TRIDACNID. 
None in America. 
(To be continued.) 
GENERAL NOTES. 
BYTHINIA TENTACULATA, LINN, IN Oxnto.—Recently while col- 
lecting on Lake Erie, near Ashtabula Harbur, 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 distribution.— Geo. J. Streator, Garrettsville, O. 
Mr. S. Raymonp Roperts, Treasurer of the Conchological Sec- 
tion of the Academy of Natural Sciences of Philadelphia, and 
author of various papers on the Cypreide, 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. 
ZONITES LIGERUS var. SroneL.—From Mr. Witmer Stone I have 
received a form of Z. ligerus differing from the type in having a 
coneave, 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 
more wide, and the base around it broadly concave-—Pilsbry. 
