106 THE NAUTILUS. 



apparently most unfavorable to the propagation of the species, which 

 is entirely isolated as far as yet observed. The entire island wag 

 submerged for about ten hours to an average depth of about two 

 feet during the hurricane of August 27, 1893, and almost all vege~ 

 tation was killed at that time, a circumstance which leads to the 

 opinion that the species is of very recent introduction. The terres- 

 trial species of mollusca so far observed on the island are : 

 Polygyra espiloca Rav. Pupa fallax Say. 



Triodopsis hopetonensis Shutt. Pupa pentodon Say. 

 Cochlicella ventricosa Drap. Succinea campestris Say. 



Vertigo rugosula Sterki. Sxccinea influtn Lea ? 



I have a, single dead specimen of Mesodon thyroides Say, most 

 likely washed from the neighboring mainland, and a few specimens 

 of Stenogyra decollata L., certainly brought from Charleston, where 

 it is abundant. 



ISAAC LEA DEPARTMENT 



[Conducted in the interest of the Isaac Lea Conchological Chapter of the Agassiz Associa- 

 tion by its General Secretary, Mrs. M. Burton Williamson.] 



UNIOS. 



[Excerpts from the Report of Dr. W. S. Strode. From the Transactions of the 

 Isaac Lea Couchological Chapter for 1895.] 



To the Spoon River, only three miles away, two or 

 three hurried visits have been made. With one exception only the 

 usual shells of this stream were found. I was fortunate in striking 

 a new bed of TTnios. It was in a little bayou six feet wide and 

 about three deep by twenty long, just above a rough ledge of lime 

 and sand rock. The environment was suitable to many species, and 

 the mud and sand at the bottom of this little cove was literally 

 packed with them. In half an hour I had thrown out on the clean, 

 white sand several bushels of various species, as Uni<> liilnTrii/iifiia, 

 anodontoides, plicutus, rectus, ligamentimts, luteolas, occidens, gibbo- 

 sus, lacrymosus, pustulosus, trig onus, alatits, gracilis, ebenus, Icevissi- 

 miis, complanatus, rugosa, donaciformis, and several of the gigantic 

 wuttlplieatiis peculiar to this stream. Some of these species had 

 been so long in this still water, and were so hoary with age that 

 they were moss grown. When I had thrown out about all the little 

 bayou contained, I selected the finer specimens of such species as I 



