206 SYSTEMATIC PALEONTOLOGY 



POSITION UNCERTAIN 



Genus CORYNOIDES Nicholson 



CORYNOIDES CALICULAEIS Nicholson 



Plate LII, Figs. 1, 2 



Graptolite germs Hall, 1859, Pal. New York, vol. iii, p. 508, fig. 7. 

 Corynoides calicularis Nicholson, 1867, Geol. Magazine, vol. iv, p. 108, pi. vii, 



figs. 9-11. 

 Corynoides calicularis Weller, 1903, Geol. Surv. New Jersey, Pal., vol. iii, 



pp. 52, 214, pi. xvi, figs. 12, 13. 

 Corynoides calicularis Ruedemann, 1908, New York State Museum, Mem., 



vol. xi, pt. 2, pp. 234-237, pi. xiii, figs. 1, 6-8, text figs. 122-132. 



Description. " Khabclosome short (6-8 mm.) and relatively broad 

 (about 1 mm.), of uniform width, consisting of a sicula and three thecae. 

 Sicula small (2 mm.), conical, without apertural processes, in mature 

 specimens slightly recurving, suspended from a long and slender nema. 

 Thecae slender tubes of uniform width, all originating close to the sicula, 

 arranged in a bundle which forms an angle of 50 with the sicula. 

 Apertures straight, normal to the axes of the thecae, all adjoining at the 

 distal extremity of the rhabdosome, each provided with a pair of usually 

 curved strong spines, which often appear to be raised upon a tongue- 

 like process. Nema thin and filiform/' Euedemann, 1908. 



This curious little graptolite is so small and usually so poorly preserved 

 in the shales that its presence is often not detected without careful search. 

 Weathered shale fragments in which the color of the fossil has been 

 changed to reddish brown or even white, show specimens to the best 

 advantage. 



Occurrence. MARTINSBURG SHALE (Corynoides bed). Chambers- 

 burg, Pennsylvania, Williamsport, Maryland, and in other outcrops to 

 the south. Chazyan (Normanskill) shales, New York, and south in the 

 Appalachian Valley to Tennessee. 



Collection. U. S. National Museum. 



