No. 2367. FOSSIL PLANTS FROM COSTA RICA— BERRY. 173 



from 14 cm. to 16 cm. Maximum width, in the median region, 

 ranging from 5.5 cm. to 7 cm. Petiole stout. Midrib very stout, 

 prominent on the under surface, relatively narrow on the upper 

 surface. Secondaries 8 or 9 subopposite to alternate pairs, diverging 

 from the midrib at wide angles of about 75° to 80°, curving regularly 

 but slightly, and camptodrome in the marginal region. Tertiaries 

 thin, forming an open, prevailingly quadrangular arcolation, partly 

 consisting of percurrent nervilles. 



These leaves are slightly inequilateral and are readily distinguished 

 from the associated fossil leaves by their general outline, shorter 

 wider form, and apiculate tip. This large-leafed form is the only 

 Ficus in the collection and may be readily matched 'among the very 

 numerous existing species of this genus. 



Coty pes. —Cat. Nos. 35463, 35464, U.S.N.M. 



Order RANALES. 

 Family ANONACEAE. 



Genus ANONA Linnaeus. 



ANONA COSTARICANA, new species. 



Plate 24. 



Description. — Leaves of large size, somewhat inequilateral and 

 elliptical in general outline, with a bluntly pointed apex and a full 

 wide, eventually somewhat decurrent, base. Margins full, entire, 

 slightly undulate. Texture subcoriaceous. Length, about 17.5 cm. 

 Maximum width, in the median part of leaf, about 6 cm. Petiole 

 short and stout. Midrib stout, curved, channeled above and promi- 

 nent below. Secondaries stout, about 10 alternate pairs diverge 

 from the midrib at wide angles (55° to 80°), ascending in full even 

 curves and camptodrome in the marginal region. Tertiaries thin 

 forming an open polygonal mesh. 



This is an exceedingly well-marked species, comparable to a con- 

 siderable number of existing American species, among which may be 

 mentioned A. lutescens Safford of southern Mexico and Guatemala, 

 A. johnii Safford of Colombia and Venezuela, A. poludosa Aublet of 

 French Guiana, A. marcgravii Martius of Venezuela to Brazil, A. 

 moniana Macfadyen of the Antilles, A. spTiacrocarpa Splitgerder of 

 Panama, and the allied Raimondia quinduenis (Humboldt. Bonplant 

 and Kunth) Safford of Colombia and Ecuador. 



None of the previously known fossil forms are as large as this 

 species except certain forms from the Wilcox Eocene of the Missis- 

 sippi embayment. Among these A. ampla Berry J resembles the 

 Costa Rican species and shows the same open areolation. 



Hohtype.—C&t. No. 35465, U.S.N.M. 



> Berry, E. W., U. S. Geol. Surv. Prof. Paper 91, p. 217, pis. 39, 40, 1916. 



