GRAPTOLITES OF XEW YORK, PART 2 



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curving dissepiments give the whole rhabdosome the appearance of a leaf 

 with extremely close venation. The thecae open alternately on opposite 



sides of the branch, and number i 1-13 in 10 mm. 



Position and locality. We have seen but one specimen which is labeled 

 as coming from the waterlime at Louisville, Ky. (Middle Devonic). 



Remarks. There is no North American graptolite known to me to 

 which this very curious form bears any resemblance. Its tlabellate form, 



Fig. 82,83 Ptiograptus perc o rriiga t u s sp. nov. Fig. 82 Enlargement (x 5) of middle portion of rhabdosome. 

 Fig. 83 Enlargement (x 5) of marginal portion 



closely zigzagged branches and uniting furcate appendages give it a strik- 

 ing aspect and an isolated position which we have given recognition by 

 making it a genotype. 



desmograptus Hopkinson 



See X. V. State Mus. Mem. 7, p. 609 



Desmograptus tenuiramosus sp. nov. 



Plate 1, figure 2 



Description. Rhabdosome small, flabellate, of extremely delicate 

 appearance. Branches very thin (.14 mm wide), frequently bifurcating, 

 the resulting branches diverging at an angle of 4.0, strongly undulating 

 and frequently reuniting, in some places connected by dissepiments; the 

 meshes elongate elliptic, about 3 mm long. Thecae long, slender, dis- 



