540 The American Naturalist. LJ^ne, 
CLASS II. EQUISETINAE Prantl. 
Order IV. Equisetaceae Rich. 
Family i. Equsietaceae Rich. 
CLASS III. Lycopodinae Prantl. 
Sub -Class I. Isosporeae Prantl. 
Order V. Lycopodiaceae Rich. 
Family i, Lycopodiaceae. 
Sub-Class II. Heterosporeae Prautl. 
Order VI. Isootaceas Bartl. 
Family i. Isootaceae Bartl. 
Order VII. Selaginellaceae Meth. 
Family i. Selaginellaceae Meth. 
Our familiar Pteris aquilina L. becomes under Luerssen's 
treatment, Pteridium dquilinum Kuhn. So too Aspidium filix- 
femina Sw., the Asplenium filix formina Beruh., of the ordi- 
nary manuals, becomes Athyrium filix formina Roth.— 
Charles E. Bessey. 
PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
Philadelphia Academy of Natural Sciences. — 
April 24, 1888. Professor Ryder spoke of the displacement 
of the nucleus of tissue cells and in ova by a large amount 
of yolk matter. 
May I, 1888. Professor Leidy called attention to some 
Menopon perale, and also spoke of the parasites of the rock- 
fish.— Mr. Meehan exhibited specimens of the so-called navel 
orange.— Professor Wilson described some srial roots in corn 
caused by abnormal watering of the plant. May 9, 1888. 
Professor Leidy spoke of the parasites of the pike and the pick- 
erel. — Dr. Meyer described a tertiary barnacle, Balanus con- 
cavus, occurring in the neighborhood of Norfolk, Va. May i5. 
1888. Dr. McCook read a description of four new species of 
orb-weaving spiders. He also made a communication on the 
color of spiders. May 29, 1888. Mr. Wilcox called attention 
to a number of shells beveled and perforated to permit a stick 
being thrust through for a handle. 
June 5, 1888. Professor Heilprin called 
