90 Annals of the Carnegie Museum. 



species. The relative length of the tibia to the femur is less than in 

 any other species excepting H. neptunia, which it exceeds. ^ 



While the above are the principal points of difference leading to the 

 distinction of the orm in question from other species of Homeosaurtcs, 

 similar discrepancies will be found to exist in the relations of all other 

 accessible portions of the skeleton. Collectively these indicate that 

 we are dealing with a new species, which on account of the somewhat 

 fragile digits, I have named Homeosaurus digitatellus. For the more 

 accurate distinction of these forms the following key to the species 

 has been prepared. 



Genus Homeosaurus. 



Species. 

 Length of cranium approximately equalling the combined length of the humerus 



and ulna, or twice the length of the humerus. Femur the length of the fibula 



or .8^ the length of the cranium. Length of the fourth metatarsal and toe twice 



that of the fourth metacarpal and finger macrodactylus. 



Length of cranium approximately 1.375 of width, twice the length of the fourth toe. 



Radius approximately the length of the fourth metatarsal and toe. Combined 



length of humerus and ulna approximately the length of the tibia or fibula. 



maximiliani . 

 Length of cranium approximately 1.55 of the width. Width of cranium the length 



of the fibula, or twice the length of the fourth finger pnlchellus. 



Length of cranium approximately 1.50 of the width, 1.65 the length of the femur, 



2.5 length of the fibula. Combined 1.50 the length of the fibula neptunia. 



Length of cranium 1.33 the width. Fibula and fourth metatarsal length of fourth 



toe. Fourth metatarsal and toe twice the length of the femur jourdani. 



Fibula and fourth metatarsal the length of the fourth toe; fourth metatarsal and 



toe twice the length of the femur rhodani. 



Length of cranium 1.25 of the width, twice the length of the fourth metacarpal and 



finger. Length of fourth metatarsal and toe approximately width of cranium. 



digitatellus. 



2 This proportion is stated for the elimination of H. rhodani, with special reference 

 to its imperfect state of preservation. 

 ^ Within I mm. 



