MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



[). LINEATA, 11. 8., fig. G2. — Colony composed of .a plate, often encrusting for a con- 

 siderable distance, afterwards arising in an enrolled plate or tortuous, branched tube 

 with thin walls. Cellules small, not very prominent, arranged with a quincuncial 

 tendency. Immersed portion often distinctly rounded and bounded by a depressed 

 line, sometimes with a median longitudinal rib and one or two lateral ones on each 

 side. Free portion short, robust, bounding a small circular mouth. Behind the mouth 

 the surface usually slopes regularly to the common surface of the colony. Back of 

 the colony covered with an irregularly striate epithelial layer. The encrusted form 

 always shows a germinal plate, a little in advance of the perfect cellules, or numerous 

 partly formed cellules, never more than one layer. 



Not rare, from Timber Creek and Mullica Hill, N. J. Cretaceous. 



Approaches D. regularis, d'Orb., but differs in the mouths of the cellules being cir- 

 cular, in their being placed more regularly and in the usually striate or ribbed appear- 

 ance of the surface. This latter character is variable. Sometimes the ribs are more 

 prominent than in the figure, sometimes the only lines are the impressed ones between 

 the cellules. 



STOMATOPORA. 

 ALECTO. 



Colony composed of ramose or meandering lines, with a single row of cellules ; always 

 encrusting. Cellules tubulate, mouths usually exsert. 



From Filifascigera, this genus is distinguished by there being but a single mouth in 

 each tube, and from Protoscina by having but a single row of cellules in a branch in- 

 stead of two or more. The filiform, meandering or dichotomous form of the colony is 

 very characteristic. 



S. regularis, ii. s., fig. 63. — Colony encrusting, ramose, filiform, slightly convex, 

 sides sloping gradually towards the edge, seldom if ever very abrupt; branches 

 usually very regular. Cellules pretty regular in shape, widest usually just behind 

 the mouth, narrowing gradually behind. Mouth tubular, inclined a little forwards, 

 circular. There is no abrupt division between the cellules. Surface smooth or 

 irregularly striate transversely. 



From the Cretaceous of New Jersey ; encrusting shells and other polyzoa. From 

 Filifascigera megaera, the only species resembling it, in this formation, it can be dis- 

 tinguished, even in worn specimens, by the presence of but one opening in the tube, 

 instead of three or four. 



Fain. CRISINW^E. 

 Simple cellules on one side, opposed pores on the other. 



