105 



When sending me this beautiful and remarkable little 

 Staurastrum, Miss Butler called my attention to ^^^the little 

 gothic structure*^, a very appropriate comparison. 



St. Minneapoliense, n. sp. (Figs. 11 — 13.) — Small, 

 verrucose; semi -cells in front view sub-cuneate, with each 

 of the two opposite superior angles drawn out into a short 

 arm , with sides serrate and apex finely toothed, diverging 

 from the arm of the connected semi -cell; end view, arms 

 straight, body much elevated on each side; side-view, arms 

 straight; body much raised in the centre and crenate on 

 the apex.. Diameter, f. v., 50 — 58 ft; thickness of body 



20—25 /^*- . . 



The front view not unlike other species, but the side 

 and end views quite distinct in the unusual inflation of 

 the body. 



St calyxoides, n. sp. (Figs. 14 and 15.) — Nearly 

 equal in length and breadth; smooth or finely punctate; 

 deeply constricted; semi-cells saucer- or calyx-shaped, bea- 

 ring on the undulate margin five equally distant divergent 

 spines; end view pentagonal, each angle produced and bea- 

 ring a strong aculeus. Diameter about 33 jU^ without, and 

 75 ft with the aculei. 



Near Manchester, Ocean Co., and Green's Lake, Warren 



Co., New Jersey. 



St. Minnesotense, n. sp. (Figs. 7 and 8.) — Large, 

 punctate, spinous, about as long as broad; semi-cells broadly 

 elliptic, twice as wide as long, lateral angles each with two 

 large, straight or incurved spines or aculei, three more pairs 

 of similar spines placed slightly within the margin of the 

 end, one on each side of the semi-cell; six more, often in- 

 conspicuous, arranged around the centre; end view triangular, 

 with two spines at each angfle, and two pairs near the margin 

 between the angles, one on each side of semi -cell; around 

 the centre are nine more, but often indistinct, spines. Dia- 

 meter 65—75 fi without and 90 — 100 ft with the spines. 



Frequent in Minnesota ponds. 



St. Wolleanum, Butler. (Figs. 1 and 2.) Medium 

 size, niembrane punctate, about one-half longer than broad, 

 moderately constricted, sinuses obtuse angles; semi - cell 

 broadly oval or subhexagonal, superior and lateral angles 

 produced into subcylindrical, somewhat swollen processes or 

 arms, slightly notched at the apex; four more similar pro- 

 cesses within the margin ; end view regular, hexagonal, each 

 angle furnished with an arm as in front view; within the 

 margin, arranged in a circle around the centre, are six 



