OSTRACODA. 645 



Aparohites mlllepunotatus.] 



is really much nearer to the forms now referred to the genus than I was inclined to 

 believe two years ago. 



I have eight valves of a closely related species or variety from the lower third 

 of the Trenton shales, at Minneapolis, and another, slightly longer than the rest, 

 from the upper third near Cannon Falls. These specimens are less high than the 

 type of A. granilahiatus, the ventral margin being less convex. The anterior end also 

 is a trifle narrower, and the convexity of the valves somewhat less, while none of 

 them show anything of the granulose surface ornament nor of the marginal papillae. 

 These specimens may provisionally be known as var. neglectus. 



The straight back and dorsal angles will at once distinguish both the species 



and variety from A. ellipticus. 



-• 

 Formation and locality.— JJpT^er third of the Trenton shales, St. Paul, Minnesota. Var. neglectus 

 occurs in the lower third of the shales at Minneapolis. 



Apaechites millepunctatus TJlrich. 



PLATE XLV, FIGS. 16-18. 



Leperditia millepunctata Uleich, 1892. Amer. Geol., vol. x, p. 268. 

 Size.— (R. V.3 Length 1.57 mm.; hight 1. mm.; thickness 0.42 mm. 



Valves subelliptical, dorsal margin long, straight; ends rounded from the dorsal 

 angles, equal; ventral edges bevelled inward; point of greatest convexity a little 

 behind and beneath the middle; surface very finely punctate. 



This species is smaller than A. granilahiatus, but relatively longer, and more 

 uniformly convex. In its outline it is pimilar to Leperditella cequilatera Ulrich, from 

 the Birdseye limestone of Kentucky (see flg. 46, p. 636), but it is a little higher, has 

 beveled and not overlapping edges, and a punctate surface which is wanting in that 

 species. 



Formation and locality.— Lo^ei or middle third of the Trenton shales, near Fountain, Minnesota. 



Aparohites fimbeiatus Ulrich. 



PLATE XLV, FIGS. 10-12. 



Leperditia JimbriataTjLnics, 1892. American Geologist, vol. x, p. 268. 

 Size.— (R.V.) Length 1.88 mm.; hight 1.23 mm.; thickness 0.44 mm. 



Valves suboval, moderately and almost uniformly convex; back straight, nearly 

 two-thirds as long as the valve; dorsal angles sharp, a slight swelling of the surface 

 immediately beneath them causing them to appear somewhat prominent; ends 

 nearly equally rounded, the posterior a little the wider. The entire ventral border 

 and the ends, excepting the upper third on each side, with a fringe consisting of 

 long, almost paliform, processes, separated by intervals of 0.1 mm. or less. 



