244 =O. C. Marsh—Notice of New Dinosaurian Reptiles. 
Laosaurus celer, gen, et sp. nov. 
The present genus is indicated by various remains of small 
Dinosaurs, of two or more species. The long bones are not 
the cavities small. e vertebree preserved are biconcave, and 
the neural arches loosely united to the centra. The dorsal and 
anterior caudals are more elongated than in most Dinosaurs. 
The phalanges are so avian in character, that they would read- 
ily be taken for those of birds. The anterior limbs were much 
smaller than the posterior. 
he following are some of the dimensions of the present 
species 
Length of median caudal vertebra. __.__._.__..._.__..- so" 
Vertical diameter of anterior articulation.._....._...._-- 17 
a PaUNWehe CibtehO gs 16° 
Greatest diameter of provimal end.of ulna: .....2. 20.2. 19°5 
Length of proximal phalanx of pes ._____- 29° 
Length of second phalanx es a. en, SE 
Length of third phalanx. __.._.___ reece | 
The remains at present known indicate an animal about as 
large as a fox. ey are from the same horizon as the species 
described above. 
Laosaurus gracilis, sp. nov. 
A second species, much smaller than the above, is represented 
- by well preserved remains of various parts of the skeleton. 
size is indicated by the following measurements : 
Length of lumbar verte We er 16°" 
Transverse diameter of anterior face... _..._._......... 1° 
Transverse diameter of posterior face iv 
Lengt medintl Gaudal vertebra 16° 
Transverse diameter anterior face es ae 
Greatest diameter of proximal end of ulna_......_..___.. 17° 
The present species is from the same locality and horizon as 
the one above described. 
_ This reptile is the smallest known Dinosaur, with the excep- 
‘ton of the diminutive species of Nanosaurus (N. agilis and 
N. victor). The latter cenus possesses some very peculiar 
characters, and represents a distinct family, Nanosauride. 
’ Yale College, New Haven, February, 1878. 
