THE NATURAL HISTORY SURVEY. 381 
Proc. Cal. Acad. Sci. Proceedings of the California Academy of Sci- 
ences, 
Proc. Daven. Acad. Sci. Proceedings of the Davenport Academy of 
Sciences. 
Proc. lowa Acad. Sci. Proceedings of the lowa Academy of Sciences. 
Proc. Phil. Acad. Proceedings of the Academy of Natural Sciences 
of Philadelphia. 
Proc. U. S. Nat. Mus. Proceedings of the United States National 
Museum. 
Proc. Zod]. Soc. or P. Z.S. Proceedings of the Zodlogical Society of 
London. 
Quar. Journ. Conch. Quarterly Journal of Conchology. 
Trans. Acad. Sci. St. Louis. Transactions of the Academy of Sciences 
of St. Louis. 
Trans. Amer. Phil. Soc. Transactions of the American Philos ophical 
Society, Philadelphia. 
Trans, Ill. State Ag. Soc. Transactions of the Illinois State Agricult- 
ural Society. 
Trans. Wagn. Inst. Sci. Transactions of the Wagner Free Institute 
of Science, Philadelphia. 
Ver. Moll. Vermont Mollusca. 
MII GROSSARY: 
In the following pages the technical and other terms used in the body 
of this work are defined. References are also made to illustrations where 
they will in any way add to the understanding of a word. Terms which 
are adequately explained in the text are not here included: 
Abdominal sac. That portion of the Unionidz which contains the 
stomach and to which the gills are sometimes suspended. 
Acephalous. Headless. 
Acinose. Full of small,bulgings; resembling the kernel in a nut. 
Aculeate. Very sharply pointed, as the teeth on the radula of some 
snails. 
Acute. Sharp or pointed, as the spire of a shell (pl. xxxv, fig. 1), or 
the lip of a shell (pl. xxviii, fig. 15). 
Acuminate. Long and tapering, as the spire of some shells (pl. xxxii, 
fig. 3). 
Admedian. Next to the central] object, as the lateral teeth on the lin- 
gual membrane. 
Afferent. To bring in; when relating to a vessel or duct, indicating 
tbat it brings in its contents. 
Alate. Wing-like, as the dorsal part of some Unios (pl. xviii). 
Amceboid. Shaped like an Amceba,a small animalcule. 
Amorphous. Without distinct form. 
Amphibious. Inhabiting both land and water. 
Amphidetic. With the ligament on both sides of the umbones. 
Analogue. A likeness between two objects when otherwise they are 
totally different, as the wing of a bird and the wing of a butterfly. 
Anastomosing. Coming together. 
