84 FOSSIL ECHINI OF THE WEST INDIES. 



fectly homogeneous, and form small subconcentric and interrupted ranges, 

 quite regular. The apical disk is granular, with 4 genital pores; the two 

 anterior pores 2 and 3 are less open and are nearer together than are the 

 two posterior pores 1 and 4. The peripetalous fasciole is wide, distinct, not 

 sinuous, relatively very near the ambitus, subanal fasciole annular. 



I did not take any measurement of the height, but it is very low. 

 Cotteau says it is 35 mm. in height. The length is approximately 110 mm . 

 and the width 100 mm. 



There is only one specimen in Washington, and Cotteau does not 

 mention any other, merely saying that it is very rare. It is beautifully 

 preserved in part, but very incomplete. Ambulacrum V is finely pre- 

 served and also interambulacra 4 and 5, with the indication of the peri- 

 proct on the right side of the posterior face. It does not make any near 

 approach to any Recent species of the genus. 



Eocene, St. Bartholomew limestone, St. Bartholomew, Guppy collec- 

 tion ex Cleve, 1 specimen, holotype, U. S. Nat. Mus. No. 1 15370. 



Genus MACROPNEUSTES Agassiz, 1847. 



Type species. — Macropneustes deshayesi Agassiz, 1847, Catalogue Rai- 

 sonne, Ann. Sci. Nat., ser. 3, vol. 8, p. 8. 



Cotteau's genus Peripneustes is not recognized by authorities and is 

 considered purely a synonym of Macropneustes, which indeed Cotteau 

 himself recognized, for the species here considered he put in the genus 

 Macropneustes in his Spanish report, 1897. 



Key to West Indian Fossil Species of Macropneustes. 



Petals II and IV straight; test widest across apical system M. clevei 



Petals II and IV curved; test widest well back of apical system M. antillarum 



Macropneustes clevei (Cotteau). 

 (Plate 14, Figures 6, 7.) 



Peripneustes clevei Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, p. 40, 



plate 7, figs. 4 to 7. 

 Macropneustes clevei Guppy, 1882, Scientific Assoc. Trinidad, Proc, part 12, p. 198. Cotteau, 



1897, Bol. Com. Mapa Geol. Espafia, vol. 22, p. 93, plate 28, figs. 1 to 4. 



The following is an extract from the original description of this species : 

 Species of medium size, elongate, subcordiform, expanded anteriorly, 

 acuminate posteriorly. Upper face swollen, inclined on the sides. Sub- 

 carinate posteriorly, having its greatest height a little posterior to the 

 apical disk. Posterior face truncate subvertically, a little reentrant. Lower 

 face swollen, rounded on the sides, depressed in front of the peristome and 

 marked by an elevation of the plastron. Apical disk excentric anteriorly. 

 The anterior furrow is wanting at the summit, but is wide and deep, espe- 

 cially toward the ambitus, which it enters strongly. Anterior ambulacrum 

 III with small pores, separated, disposed obliquely, alternating on each 

 side with a row of small tubercles. The paired ambulacra are narrow, 

 elongate, and quite deeply sunken, open at the tips. The anterior pair 

 II and IV are widely divergent [at an angle of about 145° to each other], 



