96 NEW YORK STATE MUSEUM 



called attention to the Lower Siluric species, P . p r i m a e v u s from Perce 

 [N. Y. State Mus. Mem. 10, pt i, p. 73] and Weller has recently described 

 a Niagaran form of fully mature type, P. handwerki [Chicago Acad. 

 Sci. Bui. 4, pt 2. 1907. p. 2 7 1, pi. 24, fig. 6, 7]. 

 Locality. Edmunds Hill. 



Phacops (Phacopidella) nylanderi Clarke 



Plate 22, figure i 



Phacops (Phacopidella) nylanderi Clarke. N. Y. State Mus. Bui. 107. 1907. 

 p. 166 



This is an addition to the peculiar group of early Devonic species of 

 which we recognize the following other members: P. brasiliensis 

 (Maecuru), P. anceps (Decewville), P. c o r r e 1 a t o r , New York Oris- 

 kany and Gaspe sandstone. We have noted in what respects this group 

 departs from the structure presented by P. downingiae, the exemplar 

 of the generic group Acaste = Phacopidella Reed. The material from this 

 locality has afforded but a single cephalon of small size with semicircular 

 outline, rotund but not protuberant glabella, in which all glabellar lobes are 

 extinct save that at the base which takes the form of a narrow and obscure 

 ring. The preservation here is without compression which in some of the 

 other species of the series serves to indicate the glabellar furrows. The 

 nuchal ring is elevated, the eyes relatively large, and the small cheeks are 

 apparently produced into short genal spines. The length of this specimen 

 is 4 mm and its full width 8 mm. 



No indications of other parts that can be referred to this species are 

 present. 



Locality. Edmunds Hill. 



Dalmanites cf. micrurus (Green) 



Plate 22, figures 7, 8 

 See pt i, p. 120 ; pt 2, p. 18 



There are two incomplete pygidia of rather small size in the material 

 and these have the segmentation and aspect of D . micrurus as it occurs 

 in the Helderbergian of New York. We know no other parts which can 

 be referred to the same species. 



Locality. Edmunds Hill. 



Beyrichia kloedeni McCoy var. ? 



Stf p. 19 



This entomostracan has nothing in common with the widely variant 

 expressions assigned to the cosmopolitan Siluric species B. tuberculata 



