154 MONOGRAPH OF THE FOSSIL TOLYZOA OF THE 



of three very imperfect cellules, are all that we have seen of the species. It is, how- 

 ever, so distinct that we do not hesitate in describing it. We could detect no mark- 

 ings on the surface, and believe that none exist. 



SIPIION.ELLA, Hagen. 1851. 



Flustrellaria, d'Orb. 1852. 



Colony testaceous, arising in free plates or branches, cellules only on one side, back 

 plain, or exhibiting only the backs of the cellules. Cellules variously arranged. 

 Opening occupying the greater part of the surface. 



Having the same cellules as Biflustra, Membranipora, &c, this genus is readily dis- 

 tinguished by having cellules on only one side and in never encrusting other bodies. 

 It bears the same relation to Biflustra as Semieschara does to Eschara. 



S. multipora, n. s., fig. 38. — Colony free, (arranged in a tube in the only specimen 

 we have seen) cellules outside, back, or inside of the tube showing the outline of the 

 cellules. Cellules oval, juxtaposed, placed in irregular quincunx. Opening larger, 

 occupying nearly the whole surface of the cellule ; usually of the same shape as the 

 cellule, sometimes having the proximal end wider than the distal end. Cell walls 

 convex or flattened ; marked by a variable number of pits often surrounded each by 

 a distinct elevation or Avail. The mouth is sometimes constricted by a small rim, 

 parallel with the ordinary wall, placed inside of, and below it. This rim is ornamented 

 in the same manner as the larger one. 



Locality. — Santa Barbara, Gal.. Miocene. 



We have seen but one specimen of this species. It is a tube of about TO inch long 

 and - 08 in diameter. The characters of the species are well marked and cannot w r ell 

 be mistaken. 



DISCOFLUSTRELLARIA, d'Orb. 1851. 



Colony testaceous, discoidal, convex above, concave below, composed of cellules 

 arranged in regular radiating lines, each commencing by an abortive cellule. Cellules 

 rounded or angular, opening large, cavity profound. The concave or lower side is 

 marked by irregular lines, indicating the lines of cellules. 



Related in its external form to Trochopora ; the arrangement of the cellules in 

 radiating lines, each commencing by an abortive cellule, and the cellules not forming 

 annular lines would distinguish this genus, even if we were not to examine the lower 

 surface, which in Trochopora is rendered flat by being filled up by a fibrous structure. 



DLscoflustrellaria bears the same relation to Biflustra, as Lunulites does to Eschara. 



D. Bouei, G. and H. 



Lunulites id., Lea, Contr. to Geol., p. 189, pi. 6, fig. 1, 2. 

 Colony discoidal, conical, cellules arranged in regular radiating lines, new lines being 



