84 
ANNALS NEW YORK ACADEMY OF SCIENCES 
Hapsiphyllum calcareforme Hall. 
1882 Zaphrentis calcareformis Hall, 12th Report of the State Geol. of Indiana, 
p. 293, pi. 21, figs. 10, 11. 
1884 Zaphrentis calcareformis Hall, 35th Report New York State Museum, p. 437. 
1900 Hapsiphyllum calcareforme Simpson, Bull. 39 New York State Museum, 
p. 203. 
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 annulations; 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 distance from its margin. 
Figs. 12-14. 
forme. X 4. 
Hapsiphyllum calcar e- 
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. Tabu he and dissepiments are 
present. 
Hall (loc. cit.) describes the species 
thus: 
