337 
[Foerste. 
is about 1.2 mm. In a transverse direction the diameter varies 
greatly, from almost the same diameter as the width, to .4mm. The 
generally unequal diameter of the tubes readily distinguishes this 
species, however, from any known Favosites. One side of these 
flattened tubes is usually more curved than the other, the second 
side being sometimes irregularly concave ; usually, however, the 
appearance is more like the somewhat flattened cells of Favosites. 
The walls of the tubes are crenulated, none of the crenulations in 
our specimens being very marked in size. Horizontal diaphragms 
occur at the rate of five in 2 mm. 
STRIATOPORA (CLADOPORA?) PROBOSC1DIALIS, Sp. UOV. 
This species occurs in considerable abundance at Fair Haven 
and in small quantities at Ludlow Falls, Ohio. The stems have an 
average diameter of 3 mm. tapering thence, often within an inch, to 
2.2 mm. ; usually however the rate of tapering is less. The stems 
branch at very unequal distances, usually more frequently where 
the diameter of the stem is greater. The more slender branches 
may be unbranched for 15 mm. or more. The polyp calyces are 
directed obliquety forwards and outward, usually forming irregu- 
larly polygonal outlines at the surface. The size of these calyces 
varies apparently a little with age, or at least with the diameter 
of the stems, from five calyces in the larger stems to almost six 
calyces in the smaller branches, in a length of 6 mm. In the larger 
calyces of some specimens the radiating striae which give name to 
the genus can be detected. In the smaller calyces these are often 
obsolete. In some specimens also a moderate number of very 
distinct pores. connecting adjacent potyp catyces can be detected. 
In others we have failed to see them. The branches of this species 
are often moderately curved and bent, but to our knowledge are 
never known to anastomose. Branching seems to be usually dichot- 
omous, the branches forming angles from 45° to almost 90° with 
each other. Our specimens usually have the form and appearance 
of the figure on Plate 97 of Davis’s Fossil Corals of Kentucky, 
taken from a specimen from the Niagara of Louisville, Kentucky. 
Halysites catenulatus, Linnaeus. 
This polymorphous species is abundantly represented in the Clin- 
ton Group. The smaller form found occurs not infrequently at 
PROCEEDINGS B. S. N. H. VOL. XXIV. 22 FEBRUARY, 1890. 
