EUASTRUM. 37 



E. PURUM, Wolle. Plate LVIII, figs. 9-11. 



Small, short ; semi-cell three-lobed, broader than long ; 

 basal lobe much inflated, terminal lobe short, dilated and 

 notched ; in lateral view the base and end are more or less 

 inflated. 



Diameter 35-45 ^ length 55-70 /*. 



The smaller form from Florida, the larger from New 

 Jersey. 



E. CUNEATUM, Jenner. Plate LVIII, figs. 12, 13. 



Semi -cells cuneate, not lobed; terminal notch linear. 



Diameter of cell 24-28 ^ ; length abont 75 //. 



Not rare ; seems of rather doubtful value as a species. 



E. MAGNIFICUM, Wolle. Plate LVIII, figs. 6-8. 



The largest of our Euastra; about twice as long as broad : 

 semi-cell five-lobed, the terminal lobe exserted ; dilated, end 

 somewhat convex, connected by a short neck ; basal and 

 intermediate lobes entire, with a deep obtuse notch between ; 

 upper margin of the basal lobes nearly horizontal and par- 

 allel with the base of the semi- cell ; no prominent tumors, 

 but one large central undulate inflation shown in lateral 

 view (fig. 7 ). End view (fig. 8) shows the terminal and in- 

 termediate lobes notched at each side. 



Diameter 100 ^ ; length about 190 /^. 



Ponds, near Malaga and Manchester, New Jersey. 



E. WOLLEI, Lagh. Plate XXIX, figs. 1-5. 



G. von Lagerheim, of Stockholm, Sweden, has seen fit to 

 change the name of our E. intermedium, Cleve, for the reason 

 that he finds that it does not correspond with the Swedish 

 plant so named by Cleve. It has much of the form, but is much 

 larger, having more than twice the diameter and twice the 

 length. Cleve states the diameter of the plant described by 

 him at 44 /< ; and length 77-80 /*. Diameter of our form is 

 112-120 }A length 160-170 // ; moreover the end of the 

 semi-cell of the Swedish plant is te>-lobed, ours is/ow-lobed. 



An apology for the error in choosing the name is un- 

 necessary. Will only remark, a full description of Cleve's 

 plant was not convenient at proper time. 



Var. QUADRIGIBBERUM. Lagh. Plate LX, fig. 29. 



Semi-cells with four horizontal inflations ; in vertical view 

 elliptic, apices acuminate, sides quadriundulate. 

 Tewksbury, Massachusetts. 



