122 PROCEEDINGS OP THE ACADEMY OP 



tubules. In some specimens, which are splendidly preserved, I see the roof 

 of every interstitial cell perforated by a minute opening. 



Locality. Shore of Lake Erie, Hamburg. Widder, C. W., in the Hamilton 

 group. 



The carboniferous limestone encloses, likewise, a number of interesting 

 representatives of the genus. 



Fistclipora Spergenensis nov. sp. 



Undulated convexo-concave laminae, or strumose utricules and cyst, with 

 an epitheca on the inner or inferior side Tubules one-third of a millimeter 

 wide, distant less than their own diameter. Orifices circular, surrounded by 

 an elevated rim, which projects more on the outer side. Many specimens 

 have no elevated tube margins, and exhibit interstitial spaces with open cells ; 

 but this is only owing to an imperfect state of preservation, or the effect of 

 detrition. Surface raised in obtuse unequal monticules, with cellulose 

 maculae in the centre. 



Locality. Spergen Hill, Ind. Warsaw Limestone. 



Fistclipora flabellum. 



It is fixed to the ground by a prevalently-cellulose, thick basal expansion, 

 consisting of concentrically superimposed layers. From this base, elevates 

 itself a compressed, more or less elongated stem, which finally expands in a 

 thin fan-like double leaf, fissible in two folia, with a dermatic crust on the 

 inner face of each. This division in two laminae goes through the whole 

 stem, to the bottom of the basal attachment. 



Tubules prostrate at first, and then bending rectangular to the surface. 

 Width one- fifth to one-fourth of a millimeter. Distance of tubules more 

 than one tube diameter, arranged in subregular rows, which are much inter- 

 rupted by large, not elevated cellulose maculae. No diaphragms observed. 

 Orifices rounded or obtusely triangular, with a projecting lip, but more fre- 

 quently not elevated above the surface, and without a lip. Intertubular 

 spaces, if in good preservation, decorated with fine flexuose anastomosing 

 striae. Cell tissue usually appearing solid homogeneous, but in some better 

 preserved specimens, of distinctly vesiculous structure, as in other Fistuli- 

 poras. In some specimens, the orifices are closed by slightly depressed 

 opercula with a small opening. 



Locality. Spergen Hill. Warsaw Limestone. 



This species shows, by its mode of growth, a strong affinity to the gronp, 

 which includes Ptylodictya, Stictopora, Phaenopora, Clathropora, etc., which 

 all do, in elementary structure, correspond with Fistulipora, being composed 

 of tubules of the same configuration, and of an intertubular cellulose tissue. 

 I find it strange, that no one describing these different-mentioned genera 

 has stated the cellulose nature of this intertubular substance, although it 

 forms an important and essential part of all these bryozoa. 



Fistclipora trifolia nov. spec. 



From an incrusting basal expansion of prevalently-cellulose nature, tri- 

 angular stems about one centimeter wide, with sharp eVlges and concave 

 sides, grow up. From the surface of these, new three-edged folds elevate 

 themselves, and prolongate into stems, whereby a very peculiar sort of rami- 

 fication is produced. Each triangular stem is composed of three leaves, 

 grown together with their inner sides, forming a three-edged central suture 

 line, from which the tubules begin in a prostrate position, but soon become 

 rectangular to the surface of their respective leaves. 



Surface generally appearing worn, with not projecting round orifices one- 

 fifth of a millimeter wide. In perfect specimens they are surrounded by an 

 elevated rim. Distance of orifices about two tube diameters. Intertubular 

 spaces where not worn, exhibiting the elevated angular outlines of the cells. 



[May, 



