10 THE NAUTILUS. 
chestnut colored), the region of the muscle-impression bordered with 
chestnut stains. Length 22, breadth 17-19, alt. 5 mm. 
Sagami, and Kashiurazaki, Boshiu, Japan (Frederick Stearns !) 
This species differs from S. atra Q. & G., coreensis A. & R., and 
their allies in, having the siphonal rib single and simple. It is 
probably the species identified as S. atra by Dunker and other 
writers on Japanese shells. Several hundred specimens collected 
by Mr. Stearns agree in the characters above given. Not one shows 
any tendency to double the siphonal rib. 
Helix (Euhadra) yaeyamensis n. sp. 
Shell sinistral, perspectively umbilicated, depressed, thin but 
rather solid, light brown with a supra-peripheral brown line. Surface 
irregularly wrinkle-striate and in places showing an excessively fine,. 
superficial spiral striation. Spire low conoidal, composed of 6 con- 
vex, slowly widening whorls, the last nearly twice as wide as the 
preceding, a trifle descending in front, rounded at the periphery and 
beneath. Aperture oblique, wide lunate ; peristome flesh-tinted, nar- 
rowly expanded and subreflexed, and slightly thickened within, 
dilated at the columellar insertion. Alt. 17, greater diam. 272> 
lesser 23 mm. 
Yaeyama (Okinawa) Island, Loo Choo group. (Frederick 
Stearns). 
This species is apparently most nearly allied to the Chinese H. 
latilabris Mlldff., but the umbilicus is more open, the lip narrower, 
aperture more oblique, ete. The umbilicus is wider and more open. 
than in H. queesita. 
ISAAC LEA CHAPTER, AGASSIZ ASSOCIATION. 
BY DR. M. L. LEACH, WEXFORD, MICH. 
A vigorous chapter of the Agassiz Association has been in exist- 
ence for several years and is known as the “ Isaac Lea Conchological 
Chapter.” Its members are scattered over this country from Maine 
to California, and some of them reside in Canada. The Chapter is 
divided into sections, each having a secretary, who has special 
knowledge of his department. A juvenile section has recently been 
added, and a goodly number of boys and girls are learning about 
shells. As the members are so widely separated, most of the com- 
