JOG MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



by attrition to mere round or elongated oval openings with a distinctly marked margin. 

 The space between the tubes is often undulated. 



Locality. — Mullica Hill and Timber Creek, N. J. Cretaceous. 



This species bears some resemblance to F. Pavonina, d'Orb., but can be distinguished 

 by the more robust clavate branches, never flattened ; by the lateral tubes being less 

 prominent and by their being shorter and more scattered. The figure represents them 

 too numerously. 



Div. III. C. TUBULATA. 



Cellules isolated, distinct, tubulate and salliant. 



Fam. TUB1QERIDJE. 



Cellules grouped in transverse lines, no intermediate abortive cellules, no special 

 nor intermediate pores to the cellules. 



SPIROPORA, d'Orb. 



Colony cylindrical, testaceous, composed of straight, dichotomous branches ; cel- 

 lules arranged in annular or spiral lines around the branches forming but a single 

 series to a line. Cellules often exsert. 



The peculiar, simple rings of cellules distinguish this genus from Peripora, in which 

 the lines are composed of more than a single row of cellules. 



S. calamus, n. s., fig. 55. — Colony small, cylindrical, covered by annular rows 

 of rather large cellules with about eight cellules in a ring. Cellules probably exsert. 

 Between the cellules, longitudinally, is a prominent rib. 



Locality. — Timber Creek, N. J. 



The above description is from a single worn specimen, but since it is the only species 

 of the genus yet found in this country, and is undoubtedly different from those here- 

 tofore described, we venture to name it. The only character that we can point out, 

 with certainty, is the longitudinal rib between the cellules. In one place we noticed 

 a cellule far from the regular annular line, apparently indicating a tendency to a some- 

 what spiral arrangement. We also believe that the cellules were fully as exsert as 

 most of the species figured by d'Orbigny. 



It seems most nearly allied to S. annulata, d'Orb., but the rows of cellules are pro- 

 portionally closer together, the number of cellules, in a row, is smaller and the mouths 

 of the cellules were probably more distinct and less regularly placed. The last two 

 characters are badly represented in the figure, but it is on account of the worn condi- 

 tion of the specimen. 



