10 G. 0. Sårs. 



form was raised, had been taken at Itatiba, in the neigh- 

 bourhood of Sâo Paulo. 



Gen. Diaplianosoma, Fischer. 



Remarks. — Very easily recognisable as this genus 

 is, the distinction of the several species is, on the other 

 hand, connected with no small difficulty, and it is well known, 

 that the specific value of the 2 European forms long ago 

 known, is still much disputed by different authors. Recently, 

 however, several exotic species have been established, and 

 some characters pointed out, which seem to afford suitable 

 specific marks. Among these may be named the development 

 of the inner duplicatures of the valves, the form of the head, 

 and the relative length of the antennæ. No species of this 

 genus has hitherto been recorded from South America, and 

 it may therefore be of interest to obtain information about 

 the 2 Brazilian species treated of below. 



2. Diaplianosoma Sarsii, Richard. 



(PI. II, figs. 1—10) 



Diaplianosoma Sarsii, Eichard, Entomostraca receuillis, par M. E. 

 Madigliani dans le lac Toba, Sumatra. Ann. Mus. civico di st. 

 nat. Vol. XIV, p. 66& 



Specific Characters. — Female. Carapace of the 

 usual oblong form, being almost transversely truncated behind, 

 with the upper corner rectangular, the lower obliquely cut 

 off and armed with a series of small denticles; dorsal mar- 

 gin more or less arched, according to the number of ova 

 and embryos contained in the matrix, ventral straight and 



