Prof. F. M'Coy on some new Mountain Limestone Fossils. 169 



Clisiophyllum turbinatum (M'Coy). 



Sp. Char. Corallum simple, turbinate, very rapidly enlarging, 

 attaining the adult diameter of about 1| inch at 2 inches from 

 the point of attachment ; surface of the strong external wall or 

 epitheca marked by coarse, numerous, imbricating transverse 

 striae, and a few larger inequalities of growth (no distinct lon- 

 gitudinal striae except when abraded) : horizontal section, cen- 

 tral area or axis nearly equalling one-half the diameter of the 

 coral, composed of a close crumpling of fine vesicular plates, 

 crossed by a few radiating irregular extensions of every fourth 

 or fifth of the radiating lameUse, one of which, stronger than 

 the rest, is usually seen to cross the middle (forming a thick 

 mesial line in the vertical section, and a prominent crest in the 

 cup) ; lamelliferous axis rather less than one-third of the whole 

 diameter, radiated by about fifty-four strong, equal lamellae 

 (at a diameter of 1 inch), connected by numerous delicate 

 transverse vesicular plates; four laniellge in the space of 2 lines 

 near the margin ; outer or perithecal area less than one-foui'th 

 the width of the lamelhferous zone, from which it is separated 

 by a thin definite boundary ; it is composed of about two ob- 

 scure rows of small, compressed cells, more or less crossed by 

 costal extensions of the lamellae : vertical section shows a strong, 

 solid line down the middle of the axis or middle area, a thinner 

 soHd line defining the axis on each side, and a similar one be- 

 tween the middle and external areas ; external area very nar- 

 row, of about two rows of minute cells ; middle of about three 

 rows of large rhomboidal cells formed of thin, moderately 

 curved vesicular plates converging upwards and inwards at a 

 low angle ; inner area composed on each side of about three 

 rows of cells, converging upwards to the mesial line, much 

 smaller and more compressed than those of the middle area : 

 terminal cup of moderate depth, lined by the thick, equal, ra- 

 diating lamellae, the axis forming a moderately prominent boss 

 in the bottom, crossed by a small prominent crestiform plate. 



This is easily distinguished from the other known species 

 by its short, rapidly expanding turbinate form; it resembles 

 the C. bipartitum in the crest-like median plate on the boss or 

 central area (axis), but differs in having the axis much smaller, 

 the middle area much larger, the perithecal area smaller, and the 

 fewer lamellae, besides the difference in shape. The C. Keyser- 

 lingi, like the last species, has short secondary lamellae between 

 the longer ones ; it also differs from this in its very slender form, 

 and wants the crest across the axial boss in the cup, but is other- 

 wise nearly allied, although very distinct as a species. 



