156 PROCEEDINGS OF THE ACADEMY OF 
tSuccinea Hawkinsi, Bld. tSuccinea Oregonensis, Lea. 
jrusticana, Gld, effusa, Shuttl. 
Nuttalliana, Lea. +Salleana, Pfr. 
VERONICELLIDA. 
Veronicella Floridana, Binn. }Veronicella olivacea, Stearns. 
A. Jaw absent. 
Family OLEACINIDA. 
Genus GLANDINA, Schum. 
Lingual membrane narrow, with chevron-shaped rows of uni- 
form, aculeate, separated teeth; central tooth with a long, slender, 
Je, I peliiowges 
4 Sy By RT. 
DHS at 
Si DBAS 
Lingual membrane of G. truncata. Lingual dentition of Glandina truncata. 
straight base of attachment, with incurved sides, and with inferior 
lateral slightly expanded angles, and with the upper margin re- 
flected and extended into a long, slender, acutely pointed cusp. 
There are no lateral teeth, the balance of the membrane being 
composed of marginal teeth of the pure aculeate form. 
Hach row of teeth on either side of the median line curves first 
backward, with the teeth rapidly increasing in size as they pass 
outwards, and then forwards as the teeth gradually again become 
smaller; giving an irregularly verescentic shape to the half row of 
teeth. This is shown particularly in Gl. Alberst and G. rosea, 
less so in Gl. truncata. The central tooth was overlooked by 
Wyman, Leidy, and other of the earlier investigators. It has 
