I2 Q NEW YORK STATE MUSEUM 



of a small Sp. macropleura Conrad, 1 an extreme expression of the 

 form presented by S. togatus Barrande and variety subsinuata 

 A. Roemer; 2 the first from the New Scotland Helderbergian of New York 

 and the others from the lowest Devonic of the Hartz and Bohemia. 



In S. macropleuroides the shell is more sharply plicate than 

 in the others, the plications being two or three in number on each side of 

 the median fold or sinus. Neither of the latter is extremely developed, 

 being broad and regularly rounded ; the lateral plications are strong and 

 broad, evenly rounded and with narrow grooves. The surface is covered 

 with very fine longitudinal striae. The shell is distinct from S . macro- 

 pl e u ra in its smaller size and stronger plications, in which respect it is the 

 most progressed of all the three forms above mentioned. 



Locality, Edmunds Hill. 



Cyrtina cf. heteroclita Defrance and varia Clarke 



Locality. Edmunds Hill. 



Meristella sp. 



There are apparently two species of Meristella present, one having the 

 general aspect of M . laevis Hall (Helderbergian) the other much more 

 elongate and narrow with an extremely long median septum on the dorsal 

 valve. The material is meager and does not justify a further attempt at 

 identification. 



Locality. Edmunds Hill. 



Nucleospira cf. elegans Hall 



Cf. N u c 1 e o s p i r a elegans Hall. Palaeontology of New York. 1859. 3: 222, pi. 283 

 fig. 10-15 



An occasional specimen suggests this Helderbergian species. 

 Locality. Edmunds Hill. 



Chonetes aroostookensis Clarke 



Plate 30, figures 20-25 



Chonetes aroostookensis Clarke. N. Y. State Mtis. Bui. 107. 1907. p. 264 



Shell transversely subrectangular, length to width as two to three, 

 hinge line straight, making almost the full width of the shell ; cardinal 

 angles 90 degrees or a little more, the lateral margins expanding gently 

 outward for a very short distance ; lateral margins direct at first then broadly 



'Hall. Palaeontology of N. Y. 1859. 3:302, pi. 27, fig. la-p ; pi. 28, fig. 8a-d. 

 Hall & Clarke, ibid. v. 8, pt 2, pi. 21, fig. 22-24, 2 7- 



"Kayser. Aelt. Devon-Ablag. d. Harzes. pi. 21, fig. 3 and fig. i, 2, 7. 



