I06 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Started from a central section and increased in size by the addition 

 of thin layers that are more or less parallel to each other. The 

 number of layers may also increase by intercalating layers that are 

 attached at their points of origin to one of the adjoining layers. 

 The lower side of the frond-like forms usually has an irregular 

 skin-like layer that served as a base for the coarse, sponge-like and 

 laminated growth above. The additions to the base and to the body 

 above were made in more or less irregular, concentric lines. An 

 imperfect series of connecting radial structure is shown by figs, i 

 and 2, plate 7, and fig. i, plate 8. 



How the various forms grew by accretion and why their upward 

 growth was limited is discussed in the introduction under Mode of 

 Growth (p. loi). 



Specimens of this form attain a large size. Some in the collec- 

 tion indicate a diameter for the entire body of from. 2 to 3 feet 

 (60 to 80 cm.) with a thickness of 4 inches (10 cm.) or more. 



Formation and locality. — (400c) Algonkian, Beltian series: New- 

 land limestone; eastern slope of Big Belt Mountains, 8 miles (12.8 

 km.) west of White Sulphur Springs, at forks of Birch Creek, 

 Meagher County, Montana. 



NEWLANDIA LAMELLOSA, new species 

 Plate 10, figs. I, 2 



Layers forming the body and interspaces much narrower and 

 more regular than those of N. frondosa. The form of growth in 

 flat, frond-like bodies was much like that of N . frondosa. The 

 largest fragment in the collection has a length of 23 cm. and a 

 thickness of 3.5 cm. 



This form differs from Kinncyia simulans in the greater regu- 

 larity of its layers, and from other species of Newlandia by the fine, 

 closely arranged layers. 



Formation and locality. — (400c) Algonkian, Beltian series: New- 

 land limestone; eastern slope of Big Belt Mountains, 8 miles (12.8 

 km.) west of White Sulphur Springs, at forks of Birch Creek, 

 Meagher County, Montana. 



NEWLANDIA MAJOR, new species 



Plate 9, fig. 3 

 This Species is founded on a fragment of a large frond-like body. 

 It has a length of 2y cm. and a depth of 8 cm. The layers forming 

 the body are very thin and separated by interspaces much wider 



