410 



PROCEEDINGS OF THE ACADEMY OF 



Locality and geological position. Collected by Dr. J. Knapp, from the 

 crinoid bed, lying between the Hydraulic limestone and the Black-slate, 

 Beargrass quarries, Jefferson county, Kentucky. 



I am indebted to Dr. J. Knapp, of Louisville, Kentucky, for the use of this 

 and several other species from the same localities. 



Our species is evidently not an adult ; no analogous adult form has been 

 collected from these beds. 



Cyathocrinus Wortheni, n. s. Plate iv., fig. 2. 



The fragmentary condition of our specimen prevents a complete descrip- 

 tion. 



Calyx subcorneal, about as wide as high, expanding upward, composed of 

 pieces ornamented by carina intersecting each other at the centre of the 

 pieces ; dividing the surface into triangular spaces deeply depressed at the 

 centre of each, except the basal pieces ; upon these the carina passes from the 

 centre of the subradials downward and along the lateral margins and base of 

 the basal pieces at the line of their union with the column. Basal pieces 

 nearly as high as wide, pentangular, the lateral margins half as high as the 

 width of the base of the pieces. Subradials septagonal, nearly the same size, 

 alternating with the basal pieces. Radial pieces considerably less than the 

 subradials. A fragment of one of second primary radials is present ; it is 

 somewhat oval, the inner side is grooved by a deep furrow ; the body of the 

 piece is perforated by a round opening. The column is composed of thin 

 pieces having ten prominent thickened projections, making when joined a 

 circular column deeply indented by ten longitudinal grooves, one under the 

 centre and one under the lateral union of the basal pieces. Columnar open- 

 ing obscurely pentapetalous . 



Dimensions. 



Height to summit of first primary radials -52-100 inch. 



Diameter of base at column -28-100 " 



Diameter at summit of first radials -65-100 " 



Our example is slightly crushed. 



Geological position and locality. Collected by Dr. J. Knapp, from the same 

 locality and same beds as the preceding species ; like that species, it is rare. 



Genus ACTINOCRINUS Miller, 1821. 



Actinocrinus Cassedayi, n. s. Plate iv., fig. 3-3a. 



Calyx basin-shaped, twice as wide as high, composed of thick costate 

 pieces, the costa being partially or entirely interrupted at the sutures, mark- 

 ing the union of the pieces. The basal pieces are low, widely expanded be- 

 yond the column and body, deeply concave below, the outer margin of the 

 pieces alternately raised and depressed, presents a waving line. The summit 

 is low, covered by small prominent pieces, the central pieces being the 

 largest ; a double row of pieces not quite so large as the central ones, radiate 

 from the central pieces to the centre of each group of arms ; the spaces be- 

 tween these rows are deeply depressed, and are covered by very small pieces. 

 All the pieces covering the summit are irregularly and prominently granulated. 

 The central pieces are absent. It is probable the summit was surmounted by 

 a proboscis, which is subcentral. Near the proboscis (?) are two lip-shaped 

 pieces slightly parted, leaving an opening into the calyx. The interspaces 

 between the costa on the radial and interradial pieces are remarkably deep 

 and irregular in form. The radial pieces rise directly on the basal pieces. 

 The interradial pieces appear to be three in each space. Anal pieces, from 

 eight to ten. Column round and small, being less than half the diameter of 



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