NATURAL SCIENCES OP PHILADELPHIA. 12 L 



millimeter wide. Surface finely spinulose or granulose, exhibiting seemingly 

 dilated polygonal orifices, but actually it is the luxuriant spinulose inter- 

 tubular cell mass which forms the polygones, and obscures the tube mouths 

 within its meshes. Occurs with the former species. 



FlSTULIPORA ElUENSIS HOT. Sp. 



Undulated and distorted laminar expansions one or several millimeters 

 thick, with a wrinkled epitheca below. 



Surface spinuloso-granulose, raised in irregular low monticules, with a 

 cellulose macula on the summit. 



Intertubular spaces more or less elevated above the small projecting lips 

 of the tube orifices, making the surface appear as if covered by expanded 

 polygonal openings, as in the former species. Tubules one-filth to one- 

 fourth of a millimeter wide. 



This species has much resemblance to Fistulipora spinulifera, but it does not 

 grow in massive ramifications ; its laminar expansions are more delicate, 

 while, on the contrary, its surface has a coarser texture. 



Locality. Shore of Lake Erie, near Hamburg. Shales of the Hamilton 

 group. 



Fistulipora utriculus nov. spec. 



Strumose branching utricules, or irregular cysts, with a dermatic crust 

 covering the inner cavity. Large cellulose maculae dispersed over the sur- 

 face. Tubules one-sixth of a millimeter wide. Intertubular spaces and 

 maculae spinuloso-granulose. Orifices generally surrounded by a shallow 

 depression, from which the tube margin projects under the form of a sharp 

 lip. Distance of orifices about one tube diameter, excepting the cellulose 

 maculae. The three last-mentioned species are very similar to each other, 

 but, aside of the different manner of growth, each one has some constant 

 smaller peculiarities, which convince me of their specific difference. 



Locality. Widder, C. W., in the upper strata of the Hamilton group. 



Fistulipora crassa nov. sp. 



Digitato-ramose, or undulated explanate masses, attached to other bodies or 

 partially free, with a concentrically-wrinkled epitheca on the lower side. 

 Surface raised in obtuse monticules, with more or less extended cellulose 

 maculae on the summits. 



Tubules one-third to nearly one-half a millimeter wide, distant from each 

 other one or a little more than one tube diameter, excepting the before-men- 

 tioned maculas. 



Orifices rotundate, slightly sinuate, surrounded by an unequally-elevated 

 margin, which exhibits sometimes two dent-like projections into the tube 

 cavity. 



Tube diaphragms distant, or not developed. Intertubular tissue coarse. 

 Opercula of usual form, sometimes noticeable. 



Locality. Widder, C. W., in the lower strata of the Hamilton group, and in 

 the drift deposits of Michigan. 



Fistulipora elegans nov. spec. 



Thin laminae, with a concentrically-wrinkled epitheca below. 



Tubules one-third of a millimeter wide, prostrate at the base, rectangular 

 to the surface at the upper end. Orifices perfectly circular, with an equally- 

 projecting, crenulated rim distributed over the surface at a distance of about 

 one tube diameter, excepting the cellulose macula, which, however, are not 

 very conspicuous. Opercules very frequently preserved, flat, with a central 

 opening, which in some is closed by a subsequently deposited globular solid 

 stopper. In a few specimens, I see six elevated ridges radiate from the inner 

 opening to the outer circumference, exactly as in the opercules of Callopora 

 elegans. Intertubular cell-mass coarse, with angular cells as large as the 



1866.] 



