120 PROCEEDINGS OP THE ACADEMY OP 



Surface raised in small rounded monticules, with cellulose maculae on the 

 vertex ; distance from the centre of one monticule to the other about four or 

 five millimeters. 



Locality. It is quite common in the limestones of Sandusky, Columbus, 

 and other places, (upper Helderberg group.) 



FrsTULiPORA helios nov. spec. 



A thin laminar expansion encrusting the stem of Eridophyllum colligatum. 

 (Heliophyllum, Billings.") 



Orifices pustulose, one-sixth of a millimeter wide, distant from each other 

 about two or three tube diameters. Maculae large, depressed in the centre, 

 from which irradiate depressed cellulose spaces, giving the surface an orna- 

 mental appearance, very similar to Hellipora antheloidea. 



Drift specimen belonging to the corniferous limestone. 



FlSTULIPORA STELLIFERA nOV. Spec. 



Double leaves separable in two folia ; surface raised in low monticules, 

 distant about four millimeters from one centre to another. 



Orifices linguiform or irregularly oval, one fourth of a millimeter wide in 

 the larger diameter, surrounded by an elevated rim. A few larger and more 

 projecting orifices are generally noticed on the monticules, from the summits 

 of which narrow, cellulose, bifurcating spaces irradiate. In places to which 

 these cellulose radii do not extend, the orifices are closely approximated. 



Locality. Thunder Bay, Lake Huron, in the shales of the Hamilton group. 



FlSTULIPORA SULCATA nOV. Sp. 



Thin simple lamina?, with an epitheca below. Orifices one-fourth of a 

 millimeter wide, irregularly linguiform, surrounded by an elevated margin, 

 closely approximated and disposed without any apparent order. Maculae 

 having the form of elongate narrow foveae, which send out some radiating 

 furrows. 



Locality. Partridge Point, Thunder Bay, Michigan, in the shales of the 

 Hamilton group. 



FlSTULIPORA MINUTA nOV. Sp. 



Undulated lamina?, only half a millimeter thick, with an epitheca on the 

 lower side, and raised in low rounded monticules on the upper face. 



Tubules one-eighth of a millimeter wide, irregularly oval, distant from 

 each other somewhat more than one tube diameter. Maculae little con- 

 spicuous, on account of the minuteness of the fronds. 



Occurs with the former at Partridge Point. 



Fistulipora acervulosa nov. spec. 



Large undulated expansions, from a few millimeters to one centimetre 

 thick, and with an epithecal crust on the lower side. 



Surface elevated in monticules of about five millimeters distance. Tubules 

 one-fourth to one-third of a millimeter; of somewhat larger size on the 

 monticules. 



Cellulose macula? only feebly developed. 



Orifices rotundate, forming a prominent lip on the exterior side, equally 

 distributed over the surface, holding a distance of a little more than their 

 own diameter. Tube diaphragms distant, frequently wanting. Opercula with 

 a central opening, sometimes developed. Intertubular tissue formed as 

 usual by vertical rows of vesicules. 



Locality. Partridge Point, with the former species 



FlSTULIPORA SPINULIFERA DOV. Spec. 



Grows in branches of two or three centimetres thickness, or also in thick 

 undulated expansions. 



Surface monticulose, distance from one monticule to the other three or 

 four millimeters, summits of monticules cellulose. Tubules one-fifth of a 



[May, 



