196 PROCEEDINGS OF THE NATIONAL 2IU8EUM. vol.41. 



are represented at Whites Creek, where we find better preserved 

 calices of some of the species. 



1. Rather elongate, large, and robust. IBB low; BB large, elon- 

 gate; RR smaller than BB; radial facets deep, directed outward. 

 Ornamented with low ridges and broad furrows from facets to center 

 of BB and down to IBB, also from center to center of BB, where they 

 meet in a prominent knob. This is of the type of C. harrisi of the 

 Lower Burlington, but much stronger and coarser. Much closer to 

 it, however, is C. Icelloggi White, which is a large species with similar 

 ridges and broad furrows, and tumid basals, and the two forms may 

 well be identical. Doctor White's species is stated in the description ^ 

 to be from the Keokuk Limestone. This must have been a pure 

 lapsus pennse. I have the type-specimen before me, with the original 

 label by Doctor Barris (to whose collection it belonged) showing 

 that it came from Honey Creek, Henderson County, Illinois. The 

 Keokuk is not exposed at that localit}^, but the Burlington is, quite 

 extensively, chiefly the upper bed, although the section in the vicinity 

 goes down to the Kinderhook. From the appearance of the specimen 

 itself no collector familiar with these rocks would ever mistake it for 

 Keokuk. I have other specimens of it from the Upper Burhngton, 

 and that may be safely taken as its horizon. Two Enghsh Mountain 

 Limestone species have similar knobs at the center of the basals, but 

 the ridges, if present, are not weU shown in the types. A similar 

 ornamentation is found in a Keokuk species wliich is abundant at 

 Indian Creek, Indiana, and BoonviUe, Mssouri, but the specimens 

 are uniformly small, with a low calyx and concave base. 



Locality. — Button-mould, Bradbury, and Bell Knobs, Kentucky; 

 Palmer's farm, Clark County, Indiana; and Wliites Creek, Tennessee, 

 from which I have a complete calyx. Plates are so abundant at 

 some of the other locaUties that I have reconstructed a large calyx 

 from them. 



2. Elongate, large, with tall, erect IBB; BB elongate, longer 

 than RR, and not protuberant; RR rather short, radial facets rather 

 shallow, directed outward. Surface highly ornamented with numer- 

 ous strong, rugose wrinkles or tubercles, tending to become confluent, 

 usually in no definite order. There is considerable variety in size 

 and shape of the tubercles, but all follow the same general plan. It 

 is a very striking and beautiful species. C. rigidus White, from the 

 Lower Burhngton, has a somewhat similar pustulose surface, but the 

 pustules are well separated, and the calyx is small, low, and rotund. 

 C. conicus Philhps, from the Mountain Limestone of England, has a 

 rather similar elongate form, but the type does not show distinct 

 ornamentation. The species may be compared with C. multihracMa- 

 tus of the Keokuk, which is similarly large and elongate, but usually 



' Proc. Bost. Soc. Nat. Hist., vol. 9, p. 8. 



