LIST OF ILLUSTRATIONS. XIII 



Page. 



Diaptomus virginiensis. Terminal segments of antenna of male 458 



Diaptomus virginiensis. Fifth foot of female 458 



Diaptomus virginiensis. Fifth foot of male 458 



Diaptomus tyrelli. Terminal segments antenna of male from Yellowstone Park. 461 

 Diaptomus tyrelli. Terminal segments antenna of male from Alturas Lake, 



Idaho 461 



Left fore limb of Ceratosaurus (Allosaurus fragilis of Marsh) 502 



Right fore limb and foot of Allosaurus fragilis Marsh 504 



Right humerus of Allosaurus fragilis Marsh 506 



Left ulna of Allosaurus fragilis Marsh j*. 507 



Right radius of Allosaurus fragilis Marsh 507 



Carpal bones of Allosaurus fragilis Marsh 508 



Digits of the right fore foot of Allosaurus fragilis Marsh 509 



Map of the region about Santa Marta, Colombia 533 



Diagram to show the crustaceans in various habitats in Colombia and their 



migration routes 538 



Philosda culebrae. Left uropod and telson 541 



Philoscia walkeri. a, antenna ; t, telson ; tf , uropod 542 



Cubaris brevispinis. a, antenna; e, ventral surface of first two epimera; h, head; 



t, telson; u, iu*opod 543 



Minca ruthveni. a, first antenna; a^, second antenna; e, ventral surface of first 

 three epimera; m^, first maxilla; m^, second maxilla; mp, maxilliped; t, tel- 

 son; u, uropod 545 



Sphaeroniscus gaigei. a, antenna; m^, first maxilla; m^, second maxilla; mp, 



maxilliped ; u, uropod 547 



Sphaeroniscus colombiensis. a, antenna; h, head and first thoracic segment; 



m', first maxilla; m^, second maxilla; mp, maxilliped; u, uropod 548 



Ligyda richardsonae . a, antenna; c, copulatory organ; Z, first leg of male; m, 



first maxilla; mp, maxilliped 549 



Notropis mearnsi 583 



Cervical vertebra of Thescelosaurus neglectus 592 



Cervical vertebra of Thescelosaurus neglectus. Ventral view 593 



Fifteenth presacral vertebra, probably the second dorsal of Thescelosaurus neg- 

 lectus. Lateral view 593 



Eighth presacral vertebra of Thescelosaurus neglectus. Lateral view 594 



Third presacral vertebra of Thescelosaurus neglectus. Lateral view 594 



Anterior caudal vertebrae of Thescelosaurus neglectus 595 



Median caudal vertebrae of Thescelosaurus neglectus 596 



Distal caudal vertebrae of Thescelosaurus neglectus 596 



Left scapula of Thescelosaurus neglectus 597 



Left scapula and coracoid of Thescelosaurus neglectus 598 



Left fore limb of Thescelosaurus neglectus '. 600 



Right femur of Thescelosaurus neglectus 602 



Left tibia of Thescelosaurus neglectus 603 



Right hind leg of Thescelosaurus neglectus 604 



Right hind foot of Thescelosaurus neglectus 605 



Metatarsals of right hind foot of Thescelosaurus neglectus 606 



Pelvis and sacrum of Thescelosaurus neglectus 607 



Right thoracic rib of Thescelosaurus neglectus 609 



Fragment of sternal bone and sternal ribs of Thescelosaurus neglectus 610 



Map showing localities where Thescelosaurus remains have been found. (1) Nio- 

 brara County, Wyoming; (2) Deer Ears Buttes, South Dakota; (3) Hell Creek, 



in Montana 613 



