ABT. 22 KICHMOND FAUNAL ZONES — AUSTIN 17 



from the point of fracture ended at last in the body and arms of a 

 very small crinoid. In this bed there were many disks and many 

 crinoid bodies from which the columns had been entirely broken 

 off and swept away and a still greater number of sections of columns 

 showing fractures at both ends. Yet through all this material there 

 runs such a unity of form that after a careful examination of these 

 disconnected parts one can not doubt that in life they were all parts 

 in the structure of the little crinoid whose highly modified root and 

 the disk of the Lichenocrimis were one and the same. 



Megolograptus welchi (Miller) : One-half mile west of Clarksville, 

 Ohio, the Clarksville and Morrow Pike crosses Todd's Fork and a 

 little farther on a small tributary of that stream flowing from the 

 north, just before reaching this last crossing, the Fort Ancient pike 

 leaves the Morrow road and follows up the east bank of the tribu- 

 tary to the general level 14 ^^^^^ above. Near the top of this grade 

 a little house stands on the west side of the pike and in the tribu- 

 tar}', immediately at the rear of the house, the crinoid bed (W. 17) 

 at the top of the Waynesviile is well exposed. Here in 1874, Dr. L. 

 B. Welch of Wilmington, Ohio, discovered a pocket containing many 

 columns and bodies of Reteocrinus nealli along with a less number of 

 Dendrocii7ms casei. While exploring tlie pocket for these species 

 he unexpectedly uncovered the specimen which has served as the type 

 of this species. This specimen lay apparently entire in the bed 

 but was badly broken up in the removal and only a few fragments 

 saved. We have never collected this form and do not know the 

 extent of its vertical range. The locality is given in such detail that 

 future collectors may rediscover this unique fossil. 



Platystroyliia annieana (James) : The type of James species was 

 found in a small stream to the west of Blanchester, Ohio, and just 

 beyond the corporation limits. As the exposures in this stream and 

 in Second Creek into w^hich it flows do not extend but a few feet 

 above the level of the P. annieana bed (W. 11) of the Blanchester 

 division. It is to be assumed that this specimen came from this 

 horizon. We have collected this form in the little stream at Blan- 

 chester and also in Stony Hollow at Clarksville, Ohio from this 

 horizon. 



Plectorthis {Austinella) scoviUei (Miller) : The range of this 

 species appears to be confined to one or two limestone layers which 

 together do not have a thickness of more than five of six inches. 

 This bed is about five feet below the base of the upper Helertella 

 insculpta bed and is at the same level at which Ehynchotrema capax 

 reappears in the Richmond (W. 15 of the Blanchester division). 

 We have never seen this species in any of the exposures of this bed 

 in Clinton County but in the Blacksmith Hollow and in other 



