48 proceedings of the academy of [1889. 



March 19. 



Dr. Charles Schaeffer in the chair. 



Thirty-three persons present. 



The following papers were presented for publication : — 



" Color variations in Ophnira Panamensis and Ophnira teres," 

 by J. E. Ives. 



" On Pratincola Salax Verr, and Allied Species," by Witnier 

 Stone. 



" On new and little-known American Mollusca. No. I.," by H. H. 

 Pilsbry. 



A meeting of the Biological and Microscopical Section, Mr. 

 Harold Wingate, Director, was held conjointly with the meeting 

 of the Academy. 



Tilmadoche compacta, Wing., n. sp. — Mr. Harold Wingate 

 reported that this Myxomycete has been found during several sum- 

 mers in Fairmount Park, Phila., also at Wawa, Pa., and in Ohio, 

 (Morgan). The speaker not being able to identify it with the descrip- 

 tion of any Tilmadoche as found in the literature, sent it to many 

 correspondents under the mss. name as above. Later, a note to the 

 description of Tilmadoche columbina B., in Dr. Rostafinski's Mono- 

 graph, was found to contain points which caused the writer to think 

 that the plant was not a new species, and as sufficient material had 

 been collected by himself and Dr. Geo. A. Rex, it was sent to Mr. 

 J. B. Ellis, and issued by him in vol. XXI, of North Amer. Fungi 

 (No. 2087), under the name of Tilmadoche columbina B. 



In Grevillea (Vol. 17), No. 81, fol. 18, a note of Mr. G. Massee's 

 says that the type specimen of T. columbina in the Berkeley 

 Herbarium is very different from the plant in N. A. F., so we now 

 return to our original name. The following is a description of the 

 species : 



Tilmadoche compacta Wing., n.sp. — Sporangia brownish-white, 

 flattened globose, occasionally globose, nodding, borne on subulate, 

 yellowish-white stipes, which have a brown or blackish base, and 

 reach to a height of three or four times the width of the sporangium ; 

 sporangium-wall studded with numerous, snow-white lime-granules, 

 the remainder of the wall bronze-color, with a metallic luster, split- 

 ting on maturity in a floriform manner, with from six to twelve 

 lacinia? ; capillitium, after removal of the spores, white, with a faint 

 bluish tint under reflected light owing to the translucence or irides- 

 cence of its delicate threads ; the latter originate from a central 

 lime-granule which is generally quite large, branch several times as 



