ioo STUDIES IN GEOLOGY, No. i 



at or above the middle, ranging from 1.4 to 1.75 cm. 

 Midrib stout, prominent on the underside of the leaflet. 

 Secondaries relatively stout; about 12 pairs ascending m 

 the narrower more obovate leaflets, and less ascending in 

 the elliptical leaflets or in the fuller side of the leaflets. 

 The secondaries are approximately evenly spaced and sub- 

 parallel : they are for the most part rather straight in their 

 courses and are camptodrome in the marginal region. The 

 tertiaries are thin, but well marked, forming an open poly- 

 gonal or often nearly rectangular areolation. The leaflets 

 have the appearance of having had a glaucous surface, but 

 this may be due to their preservation. 



This species was based upon material collected by Singe- 

 wald and Miller and on certain of the leaflets figured by 

 Britton and referred to Cassia chrysocarpoides Engelhardt. 

 Of the latter the form with a petiolule may be of another 

 species, but is otherwise indistinguishable. Cassia chryso- 

 carpoides Engelhardt is relatively much shorter and 

 broader with a more pointed tip and with thinner and 

 more curved secondaries. Not uncommon at both Coro- 

 coro and Potosi. 



Cassia ligustrinaformis BERRY 

 PLATE VII Fig. 11. 



Cassia ligustrinoides Engelhardt, Sitz. Naturw. Gesell. Isis in 

 Dresden, 1887, Abh. 5, p. 37, pi. i, fig. 16; 1894, Abh. i, p. 10, pi. i, 

 fig. 27. Britton, Trans. Amer. Inst. Min. Eng., vol. 21, 1893, p. 252, 

 figs, 21, 22, 24, 25, 46-48, 63 (?), not figs. 23, 26, 27, 1893; (not 

 Schrank, Denks. Akad. Muench., vol. 6, 1816, p. 179). 



Cassia ligustrinaformis Berry, Proc. U. S. Natl. Mus., vol. 54, p. 

 139, pi. 1 6, figs. 7, 8, 1917. 



Description. Leaflets sessile, inequilateral lanceolate in 

 outline, with a pointed nearly equilateral tip and a slightly 

 blunter pointed, inequilateral base. Margins entire, evenly 

 rounded. Texture subcoriaceous. Length ranging from 

 3.5 to 5.5 cm. Maximum width, midway between the apex 

 and the base, ranging from 9 mm. to 1.5 cm. Midrib 



