. Annals of the New York Academy of Sciences. Science. 84 ANNALS NEW YORK ACADEMY OF SCIENCES 1882 1884 1900 Hapsiphyllum calcareforme Hall. Zaphrentis caleareformis Hall, 12th Report of the State Geol. of Indiana, p. 293, pi. 21, figs. 10, 11. Zaphrentis caleareformis Hall, 35th Report New York State Museum, p. 437. Hapsiphyllum calcareforme Simpson, Bull. 39 New York State Museum, p. 203. Hapsiphyllum is a genus proposed by Simpson (loc. cit.) for certain rugose corals, the majority of which occur in the Lower Carbonic or Mississippic deposits. The genus is described thus: Corallum small, si
. Annals of the New York Academy of Sciences. Science. 84 ANNALS NEW YORK ACADEMY OF SCIENCES 1882 1884 1900 Hapsiphyllum calcareforme Hall. Zaphrentis caleareformis Hall, 12th Report of the State Geol. of Indiana, p. 293, pi. 21, figs. 10, 11. Zaphrentis caleareformis Hall, 35th Report New York State Museum, p. 437. Hapsiphyllum calcareforme Simpson, Bull. 39 New York State Museum, p. 203. Hapsiphyllum is a genus proposed by Simpson (loc. cit.) for certain rugose corals, the majority of which occur in the Lower Carbonic or Mississippic deposits. The genus is described thus: Corallum small, simple, conical or horn- shaped; calyx circular, comparatively deep, with thin margins; biareal. The outer area is bounded by the external epitheca; the inner area by a sub-vertical wall of horse- shoe shape, open on the side of the septal fovea. Two of the larger septa connect with this wall in such a manner as to be appar- ently a continuation of it, and form a very distinct pyriform septal fovea; septa alter- nating in size, the smaller ones continuing for a short distance into the cavity of the corallum, there coalescing with the larger ones, which continue to the inner wall, with which they coalesce, and in which they terminate. Tabulae and dissepiments are present. Hall {loc. cit.) describes the species thus: Corallum simple, narrowly turbinate, regularly curved; diameter of calices of individuals of the same height varying from 10 to 15 mm.; exterior with frequent undu- lations and low rounded ambulations; height 25 mm.; fossette narrow, very deep, com- mencing at the center and continuing to the posterior margin; the lamellae extending to its margin coalescing and forming vertical walls; number of lamellae 50, alternating in size; at a distance of 2 mm. from the mar- gin the smaller lamellae coalesce with the others. This species is easily distinguished by the deep, narrow fossette situated on the anterior side and the regular coalescing of the lamellae at a short distanc
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