NO. 1141. FOSSIL CYCADS FICOM THE BLACK HILLS— WARD. 227 



Tlie fracture across the toj) is obli(|ue in the opposite direction from 

 tliat of the h)wer end, thus iiicn^asinj;- the cuneiforniity of both sec- 

 tions. When superposed ui)on each other these two upper sections 

 Ibrni a. sort of crook or l)end in the trunk, so that the center of jfjravity 

 falls considerably on one side and the upper piece falls off unless 

 supported. 



The truidc has evidently long Iain on one side or the other as deter- 

 mined by the above-mentioned crook or bend and been subject to much 

 erosion on the two exposed sides, while the other two sides liave corre- 

 spondiugiy escaped. The result is that the leaf scars are deeply worn 

 over much of the surface, while along the protected sides they are pre- 

 served or only irregularly broken down, leaving what look like jagged 

 projections. 



The weight of the several pieces is as follows: 



Ivilouranis. 



No. I 50. SO 



No. 2 21.32 



No. 3 17.02 



No 4 18.37 



Total 107.51 



Nothing at all approaching this species was found in the Yale collec- 

 tion. 



CYCADEOIDEA NANA, new species. 



Trunks very snuill, symmetrical, short-conical, laterally subcom- 

 pressed, 12 cm. high, 15 by 17 cm. in diameter, 49 cm. in girth, dark 

 colored, well silicitied, of medium hardness and specilic gravity, 

 unbranched, summit not depressed, terminal bud projecting from apex; 

 leaf bases ascending even the lowest ones, scars arranged in two series 

 of si)iral rows, those from left to right making an angle of SO^ and 

 those from right to left of oO'^ with the axis, very small, subrhombic, 

 averaging 10 mm. wide by mm. high, smaller near the summit, empty 

 to considerable depth; ramentaceous interstices 1 to 3 mm. thick, firm 

 in texture, usually consisting of three layers which may be regarded 

 as a lining to each of the adjacent scars with a thicker membrane 

 between; reproductive organs few, poorly defined, slightly projecting 

 with irregular markings on their outer surfaces, ]u-obal)ly for the most 

 part immature or abortive; armor -i to 5 cm. thi(;k; axis 8 cm. in diam- 

 eter, somewhat clearly marked off from the armor but without clear 

 boundaries between the cortical parenchyma and libions /one or 

 betwcc^n fhe latter and the medulla, so far as the single known speci- 

 men shows without cutting. 



This species differs from all others in a number of characters besides 

 its snnill size. The only specimen is No. 84 of the Yale collection, a 

 small, almost perfect trunk weighing only 2.05 kg. At first glaiK^e it 

 re(;alled the (J. pyfimnea of l^higland from the Lias of Lyme llegis, fig- 

 ured by Lindley and Hutton,' but on confronting the specimen with 



' J'ossil Flora of Great Britaiu, II, pi. cxuii. 



