ILLUSTRATIONS XI 



Some Pecxtejab Spiral Fossil Forms from California and Mexico 



By Wendell C. Mansfield 



Facing page 



1. Peculiar spiral fossil forms from California and Mexico 4 



2. Peculiar spiral fossil form from California _ 4 



New Land and Fresh-water Molltjsks from South America 



By William B. Marshall 



1-2. New mollusks from South America 8 



Studies of the North Ameeican Weei\^ils Belonging to the 

 Supekfamily Platystomoidea 



By W. Dwiglit Pierce 



1-5. North American Platystomoidea 34 



Birds from the Small Islands Off the Northeast Coast of 

 Dutch Borneo 



By J. H. Riley 



1. Maratua (Moeara Toea) and adjacent islands 1 



TEXT FIGURES 



The Herpetological Collections Made by Dr. Hugh M. Smith in 

 Siam from 1923 to 1929 



By Doris M. Cochran 



Page 



1. SphenomorpliAis lielenae. Type. U. S. Nat. Mus. No. 67265. From 



Nontaburi, Siam. a, top of head ; 6, profile view ; c, underside of 

 head 17 



2. Riopa TmgM. Type. U. S. Nat. Mus. No. 72275. From Koh Tao, Gulf 



of Siam. a, top of head; h, profile; c, underside of head 18 



3. Leiolopisma eunice. Type. U. S. Nat. Mus. No. 72180. From Bang 



Suk, near Pak Jong, Siam. a, top of head ; 6, profile view ; c, 

 underside of head 18 



4. Leiolopisma prwnensis. Type. U. S. Nat. Mus. No. 75591. From Pran, 



Peninsular Siam. a, top of head; 6, profile view ; c, underside of 

 head; d, dorsal scales at mid-body 19 



5. Leiolopisma kohtaoensis. Type. U. S. Nat. Mus. No. 72284. From 



Koh Tao, Gulf of Siam. a, top of head ; &, profile view ; c, under- 

 side of head 21 



6. CalUopMs huffhi. Type. U. S. Nat. Mus. No. 72307. From Koh 



Tao, Gulf of Siam. a, top of head ; &, profile view ; c, underside 



of head 37 



