mO GEOLOGY OF OHIO. 



Phylloporina angulata, Hall (Plate 28, Fig. 1), Brown's Quarry, Yellow 

 Springs (E. W. Claypole's collection), Fauver's Quarry, Soldieis' 

 Home, Siebold's Quarry four and three-quarters miles from Day- 

 ton on the Brandt pike, Fair Haven, Todd's Fork, Centreville. 



Homotrypa confluens, Foerste (Plate 29, Fig. 4a, b.). According to a letter 

 from Mr. E. O. Ulrich the species belong to the section of H. 

 separata. It possesses cystiphragms and mesopore-like interspaces, 

 the latter however voxy short. Soldiers' Home, Centreville. 



Aspidopora parmula, Foerste (Plate 28, Fig. 14), Huffman's quarry in 

 the Beavertown marl; quite common at the same quarry in the 

 upper shal} r courses of the Clinton. Soldiers' Home, in the up- 

 per ferriferous layer of Todd's Fork. The completed frond is 

 discoid in form, very thin, slightly curved so as to be convex 

 above, about 25 mm. in diameter. A form with little areas about 

 3 mm. apart, within which the regular cells are very distant, giv- 

 ing the appearance of lacuna in the frond; may be designated as 

 var. fenestelliformis. 



Callopora elegantula, Hall. Huffman's Quarry in the upper shah- 

 courses. 



Callopora magnopora, Foerste (Plate 29, Fig. 5). According to E. O. 

 Ulrich it is doubtless a direct development of C. ampla of the 

 Trenton, and C. subplana of the Cincinnati rocks. 



Lioclemella (gen. nov.) Oliioensis, Foerste (Plate 29, Fig. 6). The fol- 

 lowing notes are taken from a letter to the writer from Mr. E. O. 

 Ulrich, who very kindly assisted him here as well as elsewhere 

 in his work. This species belongs to a new genus having relations 

 to Lioclema, Ulrich, from which it differs almost solely in its mode 

 of growth. Lioclema, as is usual with ramose forms is attached 

 to foreign bodies by a broad, continuous basal expansion. In 

 L. Oliioensis and other species of the same type, the zoarium is 

 simple or but sparingly divided, and the base pointed, whether 

 for articulation as in Ptilodictya or other cases can not be said. 

 The new genus will include besides L. Oliioensis, Foerste, and 

 Trematopora f nitida, Ulrich, one or two undescribed Cincinnati 

 species, most probably Whitfield's Trematopora, anmdif era, and 

 perhaps his Chcetetes fusiformis as well. Mr. Ulrich suggests the 

 use of L. Oliioensis as a good type of the new genus. Centreville. 



Ceramopora expansa, James, Todd's Fork, in the collection of Dr. Chas. 

 Welch, son of Dr. L,. B. Welch, the collector; Brown's Quarry, a 

 typical specimen. 



HYDROZOA. 



Dictyonema pertenue Foerste (Plate 27, Figs., 27 a, b.). Soldiers' Home. 

 Dictyonema scalar if orme, Foerste (Plate 27, Figs. 28, 29). Soldiers' 

 Home. 



Clathrodictyon vesiculosunu Nichols and Murie. Yellow Springs. 



