FOSSILS OF THE CLINTON GROUP. 



531 



the Soldiers' Home Quarrie-. Since then it has been found at Fauver's 

 Quarry, and at Todd's Fork. It is evidently the 1 precursor of Dalmanites 

 vigilans and D. verrucosus, from which it differs in the character of the 

 pygidium, this being neither spined nor prolongated posteriorly. The 

 anterior outline of the head approaches the latter species more closely. 

 In specimens from Soldiers' Home, with pygidia varying from 8.3 to 14 

 mm. in length, there are ten or eleven axial segments plainly seen, the 

 eleventh or twelfth being indistinct; eight pleural segments are distinct, 

 the ninth being indistinct, a tenth being barely visible in one specimen 

 but having no groove along the top, as indeed is usually the case with 

 the ninth. Theoretically there ought to be as many pleural segments 

 as axial ones. 



Encrinurus punctatus, Wahlenberg. 



(Plate 27, Fig. 26.) 



This species occurs in the limestone at the Soldiers' Home quarries, 

 rare; Hanover, Indiana, rare; in the Orthoceras block, Huffman's Quarry, 

 rare. The following measurements were taken from various pygidia : 



l.ocalit3* of s: ecimen 



2 



M 



V 



i-J 



s 



■o 



41 



n 



No. of pleurae. 



u 



•w 41 



= ,Q 



41 3 



6 fLs 



V 



o 

 .o 



5 

 ■r. 



41 



4> 



rs 

 u 



4> 

 O 



3 



3 

 O 



V 



"o 

 u 



41 



3 



4J 



"o 



Ih 

 4> 



3 



No. of segments of 



axial lobe. 

 First No., distinct, 

 Second No., indistinct 

 Third No., barely 



visible. 



Sil'ceous Clinton, 

 Lockport. New York 



10 



11.9 



8th indistinct. 





7 



11 



15 



19 



23 



15, 19, 23 







Soldiers' Home tyt e 

 of Encr. Thrtshefi... 



8.1 



9 



7 





5 



8 



11, 12 

 2 near 

 each 

 other 



15 



18 



13, 18 









' Orthoceras block" 







7 



2 



5 



10 











Hufl man's Quarry. 

















9 



9.5 



7 





5 



8 



11 



15 





15, 18 









The " Orthoceras block" specimen shows the longitudinal rows of 

 tubercles crossing the pleurae of the pygidium very well. The inner row 

 terminates posteriorily at the fourth, the middle row at the fifth, the outer 

 row at the sixth, and a row just within the terminations of the pleural 

 ridges, at the last pleura. These rows are approximately parallel to the 

 outline of the sides of the pygidium. The Hanover, Indiana, specimen 

 shows similar but less distinct tubercles, with similar arrangement. The 



