MICRASTERIAS. 1 '29 



Var. INFLATA, fig. 9. 



M. KITCHKLII, Wolle. Plate XLI, figs. 1, 2; Plate XLII, fig. 2. 



Cells about as long as wide, sinus separating the semi-cells 

 an acute angle, ampliated ; basal lobes subcouically pro- 

 duced, obliquely and broadly truncate with two angles 

 drawn out into somewhat diverging processes, furcate at the 

 ends ; a rounded sinus between ; polar lobe separated from 

 the basal lobe by an ample, rounded, or oval sinus, sides 

 produced and furcate as the others ; apex slightly convex. 



Diameter 125 j*. in center ; ends 75 yw. ; length 125 /^. 



First specimens were collected by H. S. Kitchel. in a pond, 

 Mt. Everett, Mass. It has occurred since in many places in 

 central and southern portions of New Jersey and Florida. 



The general outline of this species has some resemblance to 

 M. adscendens, Nord., found on the Sandwich Islands, but it 

 is larger, the polar lobe is more exserted, and hence the sinuses 

 between it and the basal lobes are much wider and deeper, 

 broadly rounded, not "amplo-acutan0uto t n and the angles are 

 not "bidentate," but are simply bifurcate. 



It has a closer resemblance to M. d< i><ui)>< rata, Nord., a 

 form found in Brazil, but it is a decidedly larger plant. 



M. ARCUATA, Bailey. Plate XLIV, fig. 5. 



Quadrangular; semi -cells three lobed ; the basal lobes long 

 and arcuate, subtended by the transverse projections from 

 the ends of the slightly notched terminal lobes. 

 Diameter 90-110 //. 



Collected in Florida and described by Bailey. I have found 

 it repeatedly in New Jersey, Pennsylvania and Massachusetts. 



M. EXPANSA, Bailey. Plate XLI, fig. 12. 



Semi-cells three lobed; basal lobes subconical, lower mar- 

 ginal line regularly convex; terminal lobe more slender, 

 notched in center, spreading with an upward tendency to 

 an acute, often mucronate point. Usually smaller than the 

 preceding. 



Diameter about 75 js. 



This form is near M. fircuafa, but somewhat smaller, stouter, 

 with more regularly arched basal lobes; apices more acute, 

 often mucronate. 



Habitat the same as the preceding. 



M. QUADRATA, Bailey. 



Described by the author as ''Large quadrangular, three 

 lobed, basal lobes elongated, slightly curved, bidentate ; ter- 



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