SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 137 



thickness, with the proximal edge occasionally merging into the surface of the cellule. 

 Behind the mouth are from five to seven pairs of fossets radiating from one point, 

 placed at the bases of deep rounded excavations, opposite each other and at times 

 crossing the whole surface of the cellule so as to unite. Sometimes there is an odd 

 terminal fosset. We could detect no other ornaments on the surface. 



This rare species is founded on a single colony encrusting the type of Eschara texta. 

 The specimen is from the Eocene white limestone, from west of Charleston. S. C. 



The remarkably small size and irregular mode of aggregation of the cellules will 

 distinguish R. Cardinensis from all known species. The cellules are not more than 

 an eighth of the size of those of the Esdiara to which they are attached. The latter 

 are about '04 of an inch in length. 



R. HeermAnnii, n. s., fig. 20. — Colony encrusting in irregular patches. Cellules 

 placed without any definite arrangement; oval to elongated subquadrate in form; 

 distinctly divided by deep depressed lines. Mouth terminal, semicircular to oval or 

 subquadrate, bordered by a raised lip, often absent at the proximal edge; anteriorly 

 thickened and covered by about five prominent, perforated tubercles. Surface convex, 

 marked by five or six pairs of very depressed grooves, usually radiating, sometimes 

 extending across the whole cellule. At the lowest part of each groove is a row of 

 small pores. Ovarian vesicles large, round, prominent, and without any ornamenta- 

 tion. 



From Santa Barbara, Cal. Miocene. 



The peculiar mouth of this pretty species will at once distinguish it. In the form 

 of the cellules it resembles somewhat R. Camllnensls, but the cellules are usually 

 more regularly oval. The mouth of the latter species is plain. We take pleasure in 

 dedicating such a beautiful species to our friend Dr. Heermann, to whom students of 

 Natural History are indebted for many rare and valuable specimens, the result of his 

 assiduous collectin«;. 



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R. plana, n. s., fig. 19. — Colony irregular, encrusting. Cellules oval, arranged with- 

 out any regularity. Mouth transversely oval or reniform. Always rounded in ad- 

 vance, often encroached on in the middle of the proximal edge ; bordered by a slightly 

 thickened, elevated margin. This margin is broad, and in the middle of the proximal 

 portion it is marked by a projection or lip, quite prominent. Along the middle of the 

 lip, in the direction of the longitudinal diameter of the cellule, is a small prominence 

 or tubercle, often extending into the mouth, producing the reniform shape of the mouth. 

 The rest of the margin is marked by a median groove, sometimes a row of puncta- 

 tions, extending around the mouth, never crossing the tubercle or lip. In a few in- 

 stances we have noticed the mouth perfectly plain, being merely perforate. The sur- 

 face of the cellule is rather gibbous but not grooved. The "special fossets" are re- 

 presented by five or six pairs of rows of minute pores. These pores are not placed in 



