■ 

 144 MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



Fam. PORINIDJE. 



Subfam. PORININiE. 



REPTOPORINA, d'-Orb. 1851. 



Colony encrusting, testaceous, consisting of only one la3<er of cellules, arranged in 

 longitudinal lines and quincunx, more or less regular. Cellules juxtaposed, more or 

 less distinct, variable in form ; opening anterior, provided with one special pore behind. 



Resembles Cellepora and ReptescJiarel 'Una, but distinguished from the former by the 

 presence of a special pore, and from the latter by its being behind instead of in ad- 

 vance of the mouth. 



R. carinata, G. and H. 



Cellepora carinata, G. and H., Proc. Acad. Nat. Sci. 1860, p. 366. 



G carinata, G. and II., Jour. Acad. vol. 4, 2d ser. p. 400, pi. 69, f. 24—26. 



Colony encrusting, composed of cells arranged in regular quincunx. Cellules elon- 

 gated hexagonal, with the proximal end narrowest; sides straight. Mouth anterior, 

 oval to subquadrate, proximal margin straight to concave, (sometimes a tooth in the 

 middle?) and not of the form indicated in the figure quoted above, which is the ap- 

 pearance presented when viewed from behind and not from above. The aperture 

 points anteriorly. Cellules carinate in the middle, rarely rounded, the carination 

 reaching its highest point,. a little posterior to the mouth, from which point the surface 

 slopes to the oval margin. 



Just below the apex, and in advance of it, will be seen a small special pore. In 

 protected positions this pore opens directly in advance, but when the surface has been 

 in the slightest degree abraded, it is exaggerated in size and opens superiorly. The 

 cellules are separated by a slight wall, similar to .that seen in our species Escharinella 

 mural is. 



This species can be at once distinguished from all the others found in the same for- 

 mation, bj' the elongated hexagonal cells, the mouth pointing anteriorly, the pore 

 behind the mouth, the carinated, or as it sometimes occurs, the broadly globose surface 

 and the walls arising between and bounding all the cellules. 



R. eustomata, n. s., fig. 26. — Colony irregularly encrusting. Cellules closely jux- 

 taposed, not regularly arranged. Mouth terminal, transversely elliptical to semicir- 

 cular or subquadrate, bordered by a raised lip, plain or absent at the proximal margin, 

 marked anteriorly by from seven to ten small perforated tubercles, giving the edge a 

 serrated appearance. Special pore tubulate, arising from the surface of the cellules 

 either on the right or left side, most generally on the same side in all the cellules of 

 the same colony. Surface punctured by pores of variable size, not always perforate. 

 The surface of the tube of the special pore appears to be always intact. 



Locality. — Santa Barbara, Cal. Miocene. 



