514 PROCEEDINGS OF COLUMBUS MEETING. 



were united in pairs along a straight median line rather than in an alternate right 

 and left arrangement along a zigzag line, as is shown in Dr. Hall's figures. The 

 pores described as being " excavated in the posterior border of the ambulacral 

 plates and just within their junction with the adambulacral plates" are not 

 clearly shown on this specimen, although then' are irregular and inconstant mark- 

 ings at some of the points of the molds of the lateral extensions of the groove. 

 A series of pores near the median line is indicated by a series of small rounded 

 prominences on each siile of the median ridge and very close to it. These promi- 

 nences are opposite the lateral expansions of the groove, and one is found on the 

 mold of each ambulacral plate. The pores appear to have been perforations very 

 near the edges of the plates, or excavations in their margins. 



Another specimen of the same species from the same quarry, which has recently 

 been loaned to me for examination, shows the spines on the axillary and adam- 

 bulacral plates, but the imperfect preservation of the fossil renders them less dis- 

 tinct. The mechanically reproduced photograph (plate 15) accompanying this 

 paper shows that one ray has an obtusely rounded extremity which was, at first, 

 considered as possibly a normal character, as it is in Palseaster granulosa. The 

 finding of spines on the oral surface also seemed to ally the specimen with P. 

 granulosa ; but the presence of spines, as in the specimen described, together with 

 acutely pointed rays, both of which characters are seen in the second specimen 

 from the same quarry, are conclusive evidence that the specimen is P. eucharis. 



These fossils are extremely rare in the Hamilton shales. I have been able to 

 learn of the finding of only four in this vicinity, or, including the one mentioned 

 by Dr. Hall, the number known is five. Other localities have contributed a small 

 number. 



In the absence of the author the following paper was presented in 

 abstract by J. E. Wolff: 



ON THE STRUCTURE AND AGE OF THE STOCKBRIDGE LIMESTONE IN THE 



VERMONT VALLEY. 



BY T. NELSON DALE. 



( 'ontents. 



Page. 



Introduction .".14 



A real Geology 515 



Structure ami Age 51li 



Sections 516 



The upper Part of the Limestone and the Schist .M7 



The Fault M7 



KTm inn'. * 518 



I NTRODUOTION. 



Between the Green mountain range and the Taconic range and on the western 

 side of the Vermont valley lies a ridge which, beginning with Pine lull in Rutland, 

 extends southward through the towns of Clarendon and Wallingford about 24 miles 



