LONSDALE ON EOCENE CORALS FROM N. AMERICA. 



531 



The accompanying figure represents a 

 specimen of Eschara viminea, consider- 

 ably magnified. In the upper part are 

 shown a perfectly separated dorsal surface 

 formed of angular ridges, and an inter- 

 section of the cells belonging to the same 

 layer : in the lower part is exhibited a 

 series of mature cells. 



Locality. — Eutaw. 



24. LUNULITES SEXANGULA. (sp.n.) 



Obtusely conical ; cells hexagonal in alternate rows, surface covered, raised 

 near the distal extremity, depressed in the centre, a hemispherical tubercle fre- 

 quently at the proximal end ; mouth nearly central, transverse, very narrow ; 

 casts of interior of the cells hexagonal, parallel to the convex and concave sur- 

 faces ; concave surface casts of irregularly radiating punctured ridges and narrow 

 furrows, the ridges traversed more or less regularly by a row of tubercles ; inter- 

 val between the convex and concave surface equal depth of cells. 



Locality. 



Wilmington. 



25. LUNULITES DISTANS. (sp. n.) 



Conical ; casts of cells cylindrical, short, rounded at the lower extremity, 

 oblique to the surfaces of the cone, arranged in rows radiating from the centre 

 and divided by thin plates ; opening of cells oval ; two or more foramina con- 

 necting successive cells, and several on the projecting portion ; inner or concave 

 surface broadly ribbed, foraminated ; distance between the convex and concave 

 surfaces much greater than the depth of the layer of cells, and traversed by 

 minute channels, or tubuli. 



®$0^ki^- r '~ r S. 



a. Cast of the concave surface of Lunulitea distans magnified twice, linear. 

 The irregularity at the base represents the pebble to which the specimen was 

 originally attached ; fractured portions of the dividing plates, exceeding never- 

 theless the depth of the rows of cells, are given near the irregularity. 



b. Portion greatly enlarged, to show the detached character and almost lineal 

 distribution of the filaments or casts of tubuli connecting the concave surface 

 with the cells. ' 



c. Exhibits, greatly enlarged, the considerable oval openings of the cells on 

 the convex surface, together with casts of the cells of the connecting foramina, 

 and likewise the dividing plates. 



N N 4 



