Neiv Order of Gigantic Fossils. 15 



and eight inches, thus making the entire length of stem 

 eight feet and eight inches long. The type specimen is now 

 complete. 



One of the best and most regular specimens (dug out at E, 

 Fig. 4) was procured by Mr. Holmes, and is shown in Fig. 10. 

 Plates II. and III. show a large and excellent specimen ; the 

 several views are sufficiently descriptive in themselves. The 

 surroundings of this specimen in the quarry are shown in 

 Plate II., also in Fig. 4 at B. One interesting feature of this 

 specimen, in addition to those common to all, is the eccen- 

 tricity of the axis with respect to the spiral. It is apparent, 

 even in the greatly reduced cuts, that each whorl is full on 

 one side, but scant on the other, and that it is consistent in 

 this irregularity. 



It deserves passing notice that from top to bottom the 

 whorls of this corkscrew varied from a plumb line but one- 

 eighth of an inch in the case of one coil, in others still less. 

 The corrugated upper surface, and the flattened lower sur- 

 face, and other features already mentioned, are sufficiently 

 explained in the several cuts of the plate. Fig. 18, Plate III., 

 is a side view; Fig. 19, a view from above; Fig. 20, a view 

 from below; Fig. 30, Plate V., a section from bottom. This 

 is the finest specimen of the species found as yet. Several 

 fragments, weathered from the top, when added, will increase 

 the number of coils by one, and change the present height 

 (five feet) to a full six. The transverse portion is about 

 seven feet long, and in its greater diameter eleven inches. 

 The net-work of silicious tubes, which is a strikingly char- 

 acteristic feature, is most admirably marked in this speci- 

 men, and an attempt has been made in Fig. 21 to repre- 

 sent it. 



The Figs. 27, 28, and 29, Plate V., are intended primarily to 

 illustrate on a larger scale the upper and lower surfaces of the 

 whorls. At the same time is given in Fig. 28 a fairly accurate 

 idea of a cross-section of axis and coil. I find that, although 

 fused together so that post and vine are one, there is yet 

 plainly a line of weakness between the two. The corkscrew 



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