Ischadites. [ 



SPONGES, GRAPTOLITES, CORALS. 



R. BURSIFORHIS Hall. 



61 



1863. Beceptaculites eatoni HALL. Sixteenth Rep. N. Y. State Cab. Nat. Hist., pp. 68. 226 (not 



defined). 



1883. Receptaculites bursiformis HALL. Second Ann. Eep. N. Y. State Geologist, pi. 23, figs, 12-14. 

 1887. Ischadites bursiformis HALL. Palaeontology of New York, vol. vi, p. 291, pi. 24, flgs. 12-14. 

 Much like B. infundibuliformis in shape, but with larger head-plates of the spioules than in that 



species. , 



Formation anil locality Schoharie grit: Albany and Sohoharie counties, New York. 



K. ? SACCULTIS Hall. 



1879. Beceptaculites sacculus HALL. Transactions Albany Institute, vol. x. 



1882. Beceptaculites sacculus HALL. Eleventh Rep. State Geologist of Indiana, p. 222, pi. 1, fig. 5. 

 Probably this fossil does not belong to the Beceptaculitidfe. Its nature cannot be determined from 

 the description and figure given. 



Formation and ideality. Niagara group; Waldron, Indiana. 



R. ? INSULAKIS Sittings. 



1866. Beceptaculites ?insularin BILLINGS. Catalogue Silurian Foss. Anticosti, p. 29. 

 J884. Beceptaculites nnsularis HINDE. Quart. Jour. Geol. Soc. London, vol. xl, p. 846. 

 " Probably belongs to a quite distinct group " (Hinde). 



Formation and Locality. Anticosti group ; Antioosti. 



B.? ELEGANTTJLUS Billings. 



1865. Beceptaculites felegantulus BILLINGS Palasozoic Fossils, vol. i, p. 360, fig. 347. 



1884. Beceptaculites f elegcmtulus HINDE. Quart. Jour. Geol. Soc. London, vol. xl, p. 846. 

 This does not belong to the Beceptaculilidce. 



Formation and .Locality. Calciferous formation ; Mlngan islands, Lower St. Lawrence. 



R. ? DEVONICUS Whitfield. 



1882. Beceptaculites devonicus WIIITFIELD. Annals New York Acad. Sci., vol. ii, p. 198. 

 1890. Beceptaculites devonicus WHITFIELD. Ibidem, vol. x, p. 519, pi. vi, fig. 10. 

 Probably an Ischadites. 



Formation and locality. Corniferous of Ohio. 



ISCHADITES, Murchison emende Hinde. 



PLATE F, FIGS. 5-10. 



1839. Ischadites, MURCHISON. Siluria, p. 697. 



1842. Tetragonis, EICHWALD! Urwelt Russlands, hft. ii, p. 81. 



1852. Seknoides, OWEN. Geological Survey of Wisconsin, Iowa, and Minnesota, p. 586. 



1859. Dictyocrinus, HALL. Palaeontology of New York, vol. iii, p. 135. 



1865. Beceptaculites, (partim), BILLINGS. Palaeozoic Fossils, vol. i, p. 378. 



1884. Ischadites, HINDE. Quart. Jour. Geol. Soc. London, vol. xl, p. 810. 



The following description is somewhat condensed from Dr. Hinde 's detailed 

 diagnosis of this genus (loc. cit. p. 811): "Outer form variable. The prevalent forms 

 are ovate or biconvex ; depressed conical ; subspherical and pyriform. Base either 

 obtusely conical, flattened or concave. Summit usually obtusely conical ; rarely 

 with a small central elevation. A. small circular perforation is present in the center 

 of the summit which opens into the originally hollow cavity of the body. [According 

 to Herr Rauff, this opening is closed by a large and variable number of plates.] 



