Fossil Eeticulate Sponges. 469 



DlCTTOPHYTON PATULUM, ft. Sp. 



Upper part of the frond spreading, widely infundibuliform. 



Surface marked by strong radii with slight elevations of the sub- 

 stance, indicating a division into, probably, eight areas. Intermediate 

 spaces reticulated with radii and transverse lines of alternating de- 

 grees of strength. 



The specimen described has a height of about 63 mm., and a 

 breadth at the top of 130 mm., at the base a greatest diameter of 60 

 mm. and a smallest diameter of 35 mm. The ovate form of the trans- 

 verse section is due to compression. The original extent of the lower 

 portion of the frond is unknown. 



Formation and locality. In a sandstone of the Chemung group ; 

 Cohocton, Steuben county, 1ST. Y. 



DlCTYOPHYTON FEHESTRATUM. 



Dictyophyton fenestratum, Hall. Sixteenth Rept. State Cab. Nat. Hist., p. 



90, pi. 3, fig. 4. 1863. 



Cup robust cylindrical, elongate. Base unknown. 

 Surface strongly reticulate, and with gentle undulating annulations. 

 The fragment described has a length of 95 mm., and a greatest 

 width of 47 mm. 



Formation and locality. In the Chemung group ; Chemung Nar- 

 rows. N. Y. 



DlCTYOPHYTON RUDE. 



Dietyophyton rude, Hall. Sixteenth Rept. State Cab. Nat. Hist., p. 90, pi 5 



fig. 3. 1863. ' 



Cup cylindrical, with coarse elevated cancellating ridges and inter- 

 mediate longitudinal and transverse fine stride. 



The fragment has a length of 138 mm., and a diameter in its com- 

 pressed condition of 63 mm. 



It is very remarkable for the great prominence of the stronger 

 strise, and the nodose character developed at their intersection. 



Formation and locality. In the Chemung group ; Little Genesee, 

 Alleghany county, N. Y. 



DlCTYOPHYTOST PRISMATICUM, 11. S]) 

 Plate 18, Fig. 2. 



Cup extremely elongate, narrow, somewhat regularly octagonal, 

 prismatic ; straight or slightly curved. Tube a little flattened later- 

 ally, and giving an octagonal section having a shorter diameter from 

 two-thirds to four-fifths of the longitudinal diameter. Base attenu- 

 ate, very gradually expanding. 



