146 MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



producing the tubercle noted by Lonsdale, " below the proximal lip." The two pores 

 mentioned by him are sometimes represented by three and sometimes by but one. 

 When this tubercle is worn off it leaves an irregular pore sometimes transverse, some- 

 times longitudinal and not rarely oblique. Although there is no external division 

 between the cells, strictly speaking, still their outline can be easily determined by the 

 rows of pores always being at the extreme edge of the superficial plate separated in- 

 ternally only by the lateral walls. This species resembles in its mode of growth and 

 general appearance, Beptocellejioraria infurmata, but: a glance at the cells will distin- 

 guish them. The latter species has the cells large, convex, prominent and with the 

 aperture large and round. 



Fam. ESCEAMELLINIDJE, d'Orb. 1851. 



Sub-fam. E S C H A R E L L I N I N M. 



REPTESCHARELL1NA, d'Orb. 1851. 



Colony encrusting, composed of only one layer of cellules arranged in longitudinal 

 lines and quincunx, juxtaposed, flat or convex. Mouth generally terminal, round or 

 oval, sometimes salliant, provided with two special pores. 



Differs from the other encrusting species, provided with only one layer, by the 

 presence of two special pores and the absence of fossets. From Semiescharellina, it is 

 distinguished by being, attached by the whole surface, instead of being free. 



R. prolifera, n. s., fig. 28. — Colony encrusting; cellules arranged in quincunx, and 

 in radiating lines from a central group of two or three cellules, somewhat smaller than 

 the rest, but perfectly developed in all their structural details. Form of the cellules 

 oval, elongated, convex, slightly more elevated at the distal than at the proximal end ; 

 separated from each other, laterally, by very distinct lines, caused by the meeting of 

 the convex surfaces, and anteriorly by the elevation of the distal extremity above the 

 proximal extremity of the succeeding cellule. Mouth rounded subquadrate to circular, 

 bordered by an abrupt, but little thickened lip, which also encircles the special pores, 

 which latter are somewhat elongated longitudinally and placed immediately abreast 

 of the oval aperture on each side. Surface of the cellules, smooth. Ovarian vesicles 

 numerous and small, snbglobular, rounded anteriorly and emarginate at the oval 



margin. 



From the Cretaceous, near Mullica Hill, N. J. 



We have seen but two or three colonies of this very characteristic species, and in 

 every instance they exhibit a radiating discoidal tendency, as perfect as the encrusted 

 surface would permit. The new lines, interpolated between older ones, commence in 

 all cases by a full sized, perfect cellule ; we noticed no abortive cellules. The ovarian 

 vesicle is small and narrower than the cellule. The special pores, generally elongated 

 longitudinally, are often narrower at their anterior extremity. 



