l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I42 



of an unidentified species of Pauropygus from Ramytrace, Trinidad, 

 and he mentions another from Venezuela. 



FIBULARIA FARALLONENSIS Cooke, n. sp. 



PI. 4, figs. 1-6 



Horizontal outline subcircular, slightly produced behind. Upper 

 surface hemispherical ; lower surface flattened, depressed around the 

 peristome; margin broadly rounded. Apical system obscure. Petals 

 long, straight; poriferous zones diverging; pores circular. Peristome 

 large, central, circular. Periproct smaller, circular ; near the posterior 

 third of the radius. 



Length of holotype 4.5 mm. ; width 4.2 mm. ; height 2.9 mm. Length 

 of paratype 5.1 mm. ; width 4.8 mm. ; height T,.y mm. 



Occurrence. — Trinidad: Farallon Rock, San Fernando (USGS 

 9199, J, A. BuUbrook). 



Geologic horizon. — Middle Eocene : A reef facies of the Navet 

 formation. 



Types. — Holotype, USNM 638629a (the smaller specimen) ; para- 

 type, USNM 638629b. 



Comparisons. — Fihularia farallonensis is nearly circular in hori- 

 zontal outline, like F. texana (Twitchell) (Cooke, 1959, p. 30, pi. 9, 

 figs. 15-19), and its petals seem to be similar; but its lower surface 

 is flatter and its periproct is nearer the margin. These differences 

 also hold for Fihularia vaughani (Twitchell) (Cooke, 1959, p. 30, pi. 9, 

 figs. 23-27) and for F. alabamensis (Twitchell) (Cooke, 1959, p. 31, 

 pi. 9, figs. 20-22), both of which, moreover, are conspicuously ovate. 



CLYPEASTER ROSACEUS (Linnaeus) 



PI. 5, fig. 3 



Echinus rosaccus Linnaeus, 1758, Systema naturae, ed. 10, p. 665. 



"iClypeaster cubensis Cotteau. Egozcue y Cia, 1897, Com. Mapa Geol. Espana 



Bol., vol. 22, p. 2)i, Pl. 6, figs. 1-5. 

 Clypeaster kugleri Jeannet, 1928, Soc. Paleont. Suisse Mem., vol. 48, p. 19, pl. 2, 



figs. 4-6. 

 Clypeaster rosaccus (Linnaeus). Mortensen, 1948, Monograph of the Echi- 



noidea, vol. 4, pt. 2, p. 40, pl. i, figs. 2-4; pl. 64, figs. 1-5. Includes additional 



synonymy. 

 Clypeaster rosaccus (Linnaeus). Cooke, 1959, U. S. Geol. Surv. Prof. Pap. 321, 



p. 34, pl. 10, figs. 1-3. 



Individuals of this common Recent species vary considerably in 

 size and shape and in the width of the opening between the tips of 

 the poriferous zones of the anterior petal. Many are broadly truncated 



