160 DlCTYORPONGID.E. 



The tyi>e specimen, which is imperfect toward the base, has somewhat 

 the aspect of G. carceralls and evinces a probable agreement in form with the 

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

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

 in its stouter form and more rapid apertural exjiansion 



Dimensions. Length (incomplete) 100 mm.; apertui'al diameter (slightly 

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



Locality. Waverly group, Ohio. (Loaned by A. S. Tiffah^y.) 



CALATnOSPONGIA ? SACCTJLUS, Hall (sp.). 

 Plate l, Fig. 7. 



1863. DictijopJiyton Eedfieldi, Hall. Sixteenth Ann. Eept. N. Y. State Cab. 



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

 1884. Dictijophyton sacGulum, Hall. Thirty-fifth Ann. Rept. N. Y. State 



Mus. Nat. Hist., p. 473. 



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

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

 iilum. One extremity is i-ather 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 Calalliospoiuj ia HeJfieldi, but lacks 

 the strong horizontal bands of that sj)ecies. 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 Richfield, 

 Ohio. 



TIIAMNODICTYA, Hall. 



1863. DictyopJiyton, Hall. Sixteenth Ann. llept. N. Y. State Cab. Nat. 



Hist., p. 87. 

 1882. Phraginodictya, Hall. Note on the Family Dictyospongidaj ; Expl. 



pi. 17, figs. 10, 11. 

 1884. TJmmnodictya, Hall. Thir-ty-fifth Ann. Rept. N. Y. State Mus. Nat. 



Hist., pp. 466, 477. 



Dictyosponges with a narrow, subcylindrical, tubular stem below, 

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

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



