lYS 



PROCEEDINGS OF THE ACADEMY OF 



[1880. 



Fis. 3. 



variations from the typical C. Clint oni ; I shall, therefore, 

 describe these fragments. 



Calymene Clintoni Vanuxem. 



Glabella slightly convex, the base broad, so as to form a nearly 

 equilateral triangle. The sides are marked with three lobes, the 

 posterior one being twice as large as the middle lobe, but the 

 anterior one is ill-defined. The dorsal furrows are deep. The 

 occipital ring triangular in front, and narrowing out laterall}'. 

 The frontal limb is broad, and equal to half the length of the 

 glabella, and arched in front. It is worthy of remark that this, 

 character is not common to the minute glabella found in the same 

 beds. The fixed cheeks have a buttress thrown across them 

 extending along the sides of the glabella, but this 

 does not elevate them above it. The movable 

 cheeks are triangular in outline, and posteriorly 

 extended into spines, and correspond to tliose 

 figured by Prof. Hall, Pal. N. Y., vol. ii, pi. 66 a, 

 fig. 5, c. The}^ are convex laterally along their 

 inner half, and grooved near the outer margin, which 

 is defined by a raised border. The pj'gidium is 

 Vanuxem. The triangular in outline, and resembles the figure of 



glabella and fixed , '^ ' =" . 



cheeks showingthe this part given by Prof. Hall, Pal. N. Y., vol. ii, 

 pi. 66 a, fig. 5 a, d, except in size. The axis is 

 marked with about eight articulations. The lateral 

 lobes are not marked with ribs, as usual in Caly- 

 mene^ and in this respect the pygidium bears some 

 resemblance to that of C. arago and C. salteri^ two 

 European forms found in the Lower Silurian, and 

 described b^- Rousault in 1849. 



Geological Position. — Clinton Group, Catoosa 

 Calymene Clintoni Station; also in the Hematitic bed at Dug Gap, 



Vanuxem. The 

 movable cheek. 



Calymene Clintoni 



wide Irontal limb. 



Fig. 4. 



Geox'gia. 



