THE NAUTILUS. 21 
observations on the habits of Melongena corona on the Floridan 
coast. This mollusk is very destructive to oyster beds. It does not 
bore the shell, but inserts its probosis between the valves. The 
speaker stated that the Melongena is preyed upon by Fasciolaria 
gigantea. 
Tue Cotorapo BrotoarcaL AssocraTion, Department of Mol- 
lusea. The number of recent Mollusca hitherto known to exist in 
Colorado is 59; we are now able to add three species, bringing the 
total to 62. (1.) Pupa (Angustula) milium Gould. Rejectamenta 
of Muddy Creek, Kremmling, Grand Co. An example sent to the 
U.S. National Museum has been kindly reported on by Mr. R. E. 
C. Stearns. “The Pupa may be regarded asa western (high) elevated- 
station form of P. miliwm, larger than eastern specimens.” (2.) 
Spherium striatinum Lam. Abundant in the rejectamenta of 
Muddy Creek, Kremmling, Grand Co. (3.) Physa gyrina Say. A 
single dead shell of elongated form, found in a lake near Squaw 
Creek, Eagle Co., is referred to a form of this species. P. gyrina 
was to be expected in Colo. although it is generally replaced in this 
region by P. heterostropha, a condition of things opposite to that 
obtaining in some eastern localities. An Ancylus from the rejecta- 
menta of Muddy Creek, Kremmling, Grand Co., a dead shell, is 
thought by Mr. Stearns to be probably Ancylus caurinus Cooper. 
Should this be confirmed by the discovery of living examples, it 
is an addition to the State fauna. 
Patula cooperi var. minor Ckll. is found to occur in great numbers 
near Egeria, Routt Co., where it is the prevalent form of the species. 
This variety has not been noticed in Colorado. 
A detailed list of the Mollusca of Colorado is in course of prepara- 
tion, and it is hoped that all those who have any information bear- 
ing upon the subject will kindly afford their assistance. 
T. D. A. Cockerell, (Secretary.) 
West Cliff, Custer Co., Colorado, May 13, 1889. 
THE SHELL-BEARING MOLLUSCA OF RHODE ISLAND. 
BY HORACE F. CARPENTER. 
171.—Spheriwn rhomboideum Say. 
This elegant little species was described by Say in 1822, under 
the name of Cyclas rhomboidea, at the same time with the preceding 
