852 Report of the State Geologist. 



The type specimen, which is imperfect toward the base, lias somewhat 

 the aspect of C. carceralis and evinces a probable agreement in form with the 

 other species of the genus Calathospongia. Its condition of preservation is 

 not such as to show with certainty specific differences from C. carceralis except 

 in its stouter form and more rapid apertural expansion 



Dimensions. Length (incomplete) 100 mm.; apertural diameter (slightly 

 flattened) 84 mm.; diameter at lower extremity, 39 mm. 



Locality. Waverly group, Ohio. (Loaned by A. S. Tiffaxy.) 



Calattiospongta. ? sacculus, Hall (sp.). 



Plate l, Fig. 7. 



1863. Dictyophyton Redfieldi, Hall. Sixteenth Ann. Rept. N. Y. State Cab. 



Nat. Hist., pi. iv., fig. 6. 

 1884. Dictyophyton sacculum, Hall. Thirty-fifth Ann. Kept. N. Y. State 



Mus. Nat. Hist., p. 478. 



The specimen upon which this species (?) was founded is a small, short, 

 apparently subcylindrical cup, with a smooth surface and very fine retic- 

 ulum. One extremity is rather irregular and apparently incomplete, while 

 the other seems to be closed or enfolded. There is very slight, if any, increase 

 in diameter from one end to the other. It seems probable that the specimen 

 is incomplete and affords no precise conception of its original form. The 

 reticulation is somewhat similar to that of Calathospongia Medfielcti, but lacks 

 the strong horizontal bands of that species. Its recognition as a species and 

 its reference to this genus are only provisional. 



The length of the specimen is 33 mm. ; its width about 18 mm. 



Locality. In the shaly sandstone of the Waverly group at Riclifield, 

 Ohio. 



THAMNODICTYA, Hall. 



1863. Dictyophyton, Hall. Sixteenth Ann. Rept. N. Y. State Cab. Nat. 

 Hist., p. 87. 



1882. Phragmodictya, Hall. Note on the Family Dictyospongidae ; Expl. 

 pi. 17, figs. 10, 11. 



1884. Thamnodictya, Hall. Thirty-fifth Ann. Rept. N. Y. State Mus. Nat. 

 Hist., pp. 466, 477. 



Dictyosponges with a narrow, subcylindrical, tubular stem below, 

 abruptly widening above into a broad funnel-shaped circular cup. Surface 

 with prominent spicular ridges, but without nodes or well defined prism-faces. 



