5 66 



NEW YORK STATE MUSEUM 



Dicellograptus smithi, figures, 109, 314. 

 tenuis, 253. 

 vagans, 303. 

 Dichograptidae, 68, 71, 119, 128, 183, 233, 



247-60; morphology of thecae, 104-6. 

 Dichograptus, 9, 67, 68, 71, 109, 133, 



facing p. 66. 

 abnormis, 133. 

 divaricatus, 297. 

 flexilis, 133. 

 logani, 133. 

 milesi, 133. 

 octobrachiatus, 133. 

 octonarius, 133. 

 proximatus, 133. 

 ramulus, 133. 

 remotus, 133. 

 rigidus, 133. 

 superstes, 26. 

 Dicranograptidae, 26, 6y, 114, 115. 116, 

 117, 119, 120, 128, 291: axes of, 102-4; 

 morphology of thecae, 104-6; phylo- 

 geny of, 107-18. 

 Dicranograptus, 17, 6y, 68, 71, 78, 102. 



103, 109, in, 112, 114, 115, 116, 117, 



120, 125, 129, 133, 291, 311, 312, 



315-17, 319, facing p. 66. 

 sp., 134. 



arkansasensis, 133, 329, 33? 

 arundinaceus, 221. 

 brevicaulis, 113. 

 celticus, 112. 

 clingani, 32, 133. 



zone, 33, 270, 430, facing p. 9. 

 contortus, 14, 16, 49, 129, 134, 317, 

 337-38. 



explanation of plate, 535. 



figures, 337. 

 cyathiformis. 112. 

 dissimilaris, 134. 

 divaricatus, T34, 207. 

 foliaceus vntt. crassitcstus, 24. 



Dicranograptus formosus, 26, 306. 



furcatus, 14, 16, 17, 19, 25, 49, 109, 110. 

 112, 113, 115, 129. 134, 268, 284, 

 290, 302, 315, 317, 324. 334-36, 



338. 

 explanation of plate, 534. 

 figures, 115, 335. 

 var. exilis. 14, 49. 129, 134. 317. 337, 

 explanation of plate, 534. 

 figures. 337. 

 var. minimus, 335, 336. 

 gurleyi, figures, 103, 106. 

 inequalis, 134. 



nicholsoni, 26, 27, 30. 33. 34. 36. 39. 40. 

 70, 112, 113, 129. 134. 316, 

 317-20, 323, 325. 327. 

 explanation of plates, 528, 530. 

 figures, 318. 

 var. arkansasensis, 23, 30, 134. i,2q. 

 var. diapason, 14, 16, 34. 49. 129. 134, 

 148, 175, 305, 317. 322-24. 

 explanation of plate, 530. 

 figures, 322. 

 var. parvangulus, 14. 16, 23. 34. 40. 

 129, 134, 317, 320-22, 323, 324, 



325- 

 explanation of plate, 530. 

 figures, 71, 321. 

 var. whitianus, 25. 40. 129, 134. 135. 

 321, 322, 324-25. 

 ramosus, 14. 16, \~. 18, 19, 23. 24. 26, 

 3°- 35' 39- 49> T ° 2 - 1T2 - TI 3- I2f) - 



I34, 252, 284, 2QO. 2QT. 3I7, 3 TO. 



325-28, 320. 330. 332. 333. 334. 



335- 



explanation of plate. 530. 534. 

 figures, 102. 327. 

 See also Graptolithus ramosus. 

 var. arkansasensis, 40, 120. T34. 317, 



329. 



figures, 320. 

 var. longicaulis, 330. 



