114 
PALEONTOLOGY OF NEW-YORK. 
Genus CONOPHYLLUM (m gen.), 
[Gr. xwvo<, conus, and tpuXXov, folium; in allusion to the inverted conical septa.] 
Corallum turbinate or sub cylindrical, having transverse Septa in the form of inverted cones 
set one within the other ; rays or lamellae very thin, numerous and denticulate. 
In weathered specimens the transverse septa often project beyond the sides of the coral above, 
and the whole appears somewhat like a series of inverted cones. The weathered surfaces haA r e 
sometimes the appearance of Cystiphyllum, from the irregular meeting of the upper and 
under surfaces of the successive transverse septa. 
507. 1. CONOPHYLLUM NIAGARENSE. 
Pl. XXXII. Fig. 4 a - n. 
Irregularly cylindrical, elongated or subturbinate, more or less expanding above, externally 
rugose at intervals (when weathered often very rough) ; cup regularly concave, deep ; 
lamellae thin, distance from each other equal to their thickness, denticulated on their upper and 
inner edges ; transverse dissepiments corresponding to the concavity, and forming the cell 
or cup, and extending upwards to the margin. 
In this fossil, the rays become in fact subordinate to the dissepiments ; and the character 
would be more correctly defined, by describing the coral to consist of a series of concave discs 
or inverted cones setting one within the other, having their upper surface marked by radiating 
rows of denticles. The form is very irregular, varying from small, short, turbinate forms, to 
elongated cylindrical ones in which the diameter scarcely varies throughout. The weathered 
surfaces present the arrangement of the dissepiments more or less perfectly in numerous speci¬ 
mens. In one or two instances, I have seen specimens where the weathering developed the 
rays more prominently than the dissepiments, and in such instances the surface is beautifully 
denticulated (fig. 4 b). 
Fig. 4 a. A specimen of the turbinate form, showing the rays externally. The denticulate rays 
within the cup are also well shown, and the denticles between the dissepiments near 
and below the upper margin of the cup on the outside. 
Fig. 4 b. A turbinate specimen, showing the denticulate lamellae on the external surface. In the 
interior of the cup, the lamellae are less perfectly denticulate than in 4 a. 
Fig. 4 c. A small turbinate specimen with the surface worn, showing the successive dissepiments 
and the denticulate lamellae within the cup. 
Fig. 4 d. The external surface of an unweathered specimen, where the edges of the transverse 
dissepiments project at intervals. 
Fig. 4 e, /, g. Portions of the interior of the cup enlarged, showing the condition of preservation 
of the denticulated lamellae. 
Fig. 4 h, i, k, l. The exterior of specimens of various sizes, more or less worn, showing in 4 h 
particularly the arrangement of the dissepiments where partially worn down. 
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