Lower Helderberg Fauna. 2 i 1 



Ischadites squamifer, Hall, 1887. Pal. New York, vol. VI, p. 291, PL XXIV, 



figs. 1, 2. 

 RecejJtaculites squamifer, Miller, 1889. N. Amer. Geol. and Pal., p. 164. 

 Horizon. Shaly limestone. (Hall, 1859.) 



Receptaculites, De France, 1827. 

 Receptaculites infundibuliformis, Eaton, 1832. 



Coscinopora infundibuliformis (not Goldfuss), Eaton, 1832. Geological Text- 

 Book, p. 44, PI. V, figs. 64, 65. 



Receptacidites infundibuliformis (Eaton), Hall, 1863. Sixteenth Rep. New 

 York State Cab. Nat. Hist., p. 67. 



Receptaculites infundibidiformis (Eaton), Hall, 1883. Rep. State Geologist for 

 1882, expl. PI. XXIII, fig. 10. 



Receptaculites monticulatus, Hall, 1883. Rep. State Geologist for 1882, expl. 

 PI. XXIH, figs. 3-9, 11. 



Receptaculites infundibuliformis, Miller, 1889. N. Amer. Geol. and Pal., p. 

 163. 



Receptaculites monticulatus, Miller, 1889. N. Amer. Geol. and Pal., p. 164. 



Horizon. Shaly limestone. Helderberg Mountain, N. Y. 



Receptaculites monticulatus = R. infundihuliformis. — This spe- 

 cies, recognized by Hall as a synonym for E. infundihuliformis, 

 is retained by Miller as a distinct form. 



In 1889, a paper was read by Ka.uff, before the Deutsche Geo- 

 logische Gesellschaft, at the August session, giving briefly the 

 results of his work on Receptaculites, Ischadites, and P(»lygono- 

 SPH^ RITES, and an abstract of the paper was published in the 

 transactions of the society.* This -abstract is summarized by 

 JSTicHOLsoNf as follows : 



"1. The Receptaculitidae are spherical or pyriform bodies, with 

 a central closed cavity, the supposed basin-shaped examples being 

 only fragments of the base. 



2. Each of the individual spicular elements forming the wall 

 of the body is composed of six parts, viz.: an external plate of 

 an essentially rhombic form, four diagonally intersecting tangen- 

 tial arms whi(;h lie immediately below the outer plate, and a 

 radial arm or pillar which springs from the benter of the outer 

 plate on its inner side and is directed perpendicularly inwards. 



3. An upper and a lower pole may be distinguished on the 

 exterior surface, the arrangement of the plates at these points 

 being peculiar. The basal pole (the starting point of growth) 



* Rauff. 1888. Zeitschrif t der Deutschen Geol. Gesellseh., Bd. XL, Heft 3, p. 606 et seq. 

 Nichols on and Lydekker, 1889. Manual of Palseontology, vol. II, p. 1563. 



