20 THE NAUTILUS. 
Bd., dissected by Mr. Witmer Stone at the Academy of Sciences, 
numerous Limax campestris Binn. were found.— Pilsbry. 
STROBILA HUBBARD! A. D. Brown, has recently been found by 
Mr. C. W. Johnson at St. Augustine, Fla. 
Disrrisution of Helicina occulta Say. To the localities given 
by Mr. Keyes in his paper on this species, may be added, Lexington, 
Va., where living specimens are abundant (Tryon, Amer. Journ. 
Conch. 1869, p. 118). There is also the original locality in western 
Pennsylvania given by Green for his “H. rubella,” a synonym of H. 
occulta. The species was first reported from the West by Mr. E. R. 
Leland, in 1869, who found living examples at Whitefish Bay, a 
fishing station about five miles north of Milwaukee, Wis. (doe. cit.). 
At Iowa City, Ia., where Prof. B. Shimek and the writer collected 
the species in 1880, it is eaten by Selenites concava Say. Its oper- 
culum affords the little Helicina no protection against the sabre-like 
teeth of the bloody-minded Selenites, which bores an opening 
through the front of the body-whorl and dines upon Helicina raw on 
the shell.— Pilsbry. 
PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA—-CONCHO- 
LOGICAL Section, May 14. John H. Campbell in the chair. Exhibits 
of series of Oliva inflata Lam. etc. made by Mr. John Ford, who 
spoke at length upon the characters and variations of Oliva. Atten- 
tion was called to the extraordinary variation in coloration in the 
genus, and a number of the principal varieties commented upon ; 
among them a remarkably thin-shelled form of O. inflata, which the 
speaker proposed to call var. ovum-ralli. My. Pilsbry spoke of the 
modes of specialization of the radula in rhipidoglossate mollusks. 
The marginal teeth undergo but slight changes throughout the 
group. The reduction in number of the teeth of the median portion 
of the membrane, consequent upon the increased size of the individ- 
ual teeth, takes place in the Trochide by the loss of outer laterals ; 
in Turbinide and Phasianelline by the degeneration of the rhachi- 
dian and inner lateral teeth. Mr. Eusélma C. Smith exhibited a 
selection of Conus, and commented upon a number of the rarer 
forms of the genus, which he had procured. Mr. Campbell discussed 
the variations of Cyprea, mentioning the peculiarities exhibited by 
the species of New Caledonia and other localities, illustrating his re- 
marks by numerous specimens. Mr. Jos. Willcox spoke of his 
