A D DENDA. 
RECEPTACULITES, De France. 1827. 
RECEPTACULITES 1NEUNDIBULIF0RMTS. 
PLATE XXIV, FIGS. 3-11. 
Coscinopora infundilniliformis, (Goldfuss) Eaton. Geol. Text Book. 1833. 
Receptaculites infundibuliformis, (Eaton) Hall. Sixteenth Rept. N. Y. State Cabinet of Nat. Hist., p. 67. 
1863. 
“ “ “ “ Report of State Geologist for 18S2. Expl. pi. 23, fig. 10. 
18S3. 
Receptaculites monticulatus , Hall. Report of State Geologist for 18S2. Expl. pi. 23, figs. 3-9, 11. 1883. 
Not Cvscinopom infundibuliformis, Goldfuss. 
Sponge usually discoid, sometimes broadly infundibuliform. The upper sur¬ 
face is more or less depressed with frequently a small conical projection in 
the center. The summit plates of the spicules are from 1 to 4 mm. in 
width. The best preserved specimens show prominent nodes or spines at 
the angles of junction of the cavities left by the solution of the plates of 
the upper layer, which probably are the fillings of perforations at the angles 
of the junction of the spicular plates, as described by Dr. J. G. Hinde in 
R. occidentalism Salter, (Quar. Jour. Geol. Soc., vol. xl, pi. 37, figs. 3d, f. g.) 
Vertical spicules from 4 to 8 mm. in length and from 1 to 2 mm. in diameter. 
The largest specimen observed measures 140 mm. across the disk and has a 
central depressed area 100 mm. in diameter. The smallest specimen yet 
noticed has a diameter of 29 mm., and the height of the cup is about 15 mm. 
The forms indicated under the name R. monticulatus, in the Report of the 
State Geologist, prove to be small and better preserved specimens of the 
original species described by Eaton. 
Formation and locality. In the shaly limestone of the Lower Helderberg 
group, near Clarksville, Albany county, N. Y. 
