NO. 1141. 



FOSSTL CYC ADS FROM THE BLACK HILLS— WABD. 203 



Only one imperfect specimen, namely, No. 78, of the Yale collection 

 could be referred to this species, and this not without some doubt. 



CYCADEOIDEA CICATRICULA, new species. 



Trunks small and short, subconical, more or less laterally compressed, 

 smooth and symmetrical, nnbranched, light yellowish- brown on the. 

 weathered surfaces, iine-grained and Hinty within, about 20 cm. high, 

 18 by 22 cm. in diameter, with a girth of about CO cm., and weighing 

 13 or 14 kg. ; organs of the armor nearly horizontal; leaf scars arranged 

 in two definite series of spiral rows, those from left to right forming 

 an angle near the base of about 70° with the axis but curving inward 

 in their upward course so that the angle progressively diminishes to 

 about 30° at the summit; those from right to left only slightly curving 

 and making an angle of about 45^; scars very small, almost exactly 

 rhombic, uniform and definite with all the angles sharp, distance 

 between lateral angles 9 to 12 mm., and between vertical ones G to 8 

 mm.; leaf bases present filling the scars to near the top presenting a 

 rou..hened spongy tissue; rainentaceous walls very thin, varying from 

 the'thickness of tin foil to 2 mm., presenting a beautiful and regular 

 network of whitened lines over the entire outer surface of the trunk, 

 with a faint commissure or elongated openings between the contiguous 

 plates of the thicker ones; reproductive organs not abundant nor well 

 developed, the most typical 3 cm. in diameter, variable in shape and 

 character, consisting of protuberances with a depression at the top or 

 ridges with bract scars on the sides, others anomalous consisting ot 

 small projections or elevations, probably abortive, none of them greatly 

 disturbing the form or arrangement of the leaf scars; armor 3 cm. 

 thick, separated from the wood by a definite line or crack; cortical 

 parenchyma 2 cm.; secondary wood 3 cm., consisting of an outer ring 

 2 cm. thick and an inner one 1 cm. with a fissure between; medulla 

 elliptical, 5 by 7 cm. in diameter, consisting of a homogeneous substance 

 resembling fine yellow sandstone, clearly marked off from the inner 



ring of wood. , , i. •<. 



This species is one of the best defined of all, notwithstanding that it 

 is based upon a single specimen, namely, No. 118 of the Yale collection. 

 This is an almost perfect trunk, and is only obscured by sand and 

 gravel cemented in the scars so that very little can be seen of the 

 summits of the leaf bases. It was collected by Mr. H. F. Wells 

 three-fourths of a mile north of Black's ranch, about 3 miles north of 

 Blackhawk, South Dakota. 1 ts only aftinities are with G. pulcherrima, 

 with which it shares the rhombic scars and their definitely arranged 

 rows. 



CYCADEOIDEA TURRITA, new species. 



Trunks of moderate size, profusely and irregularly branched, the pri- 

 mary branches often bearing secondary ones, the branches symmetrical, 

 abruptly contracted at the base into cylindrical, turret-shaped projec- 



