16 PROCEEDINGS OF THE XATIOXAL ^fT .^EUM. vol.37. 



mm. 



Proximal w idtli of tibia 3 



Median width of tibia 1.50 



Distal width of tibia 2 



Length of radius 8 



Proximal width of radius 2.50 



Median width of radius 1. 50 



Distal width of radius 3 



Length of tibiale 4 



Width of same 2 



Length of radiale 3.50 



Width of same 2.50 



AVidth of the distal tarsalia L 50-2 



Length of metatarsal of the fourth digit 5 



Length of the first digit of the foot 8 



Length of second digit -_ 14 



Length of third digit 18C?) 



Length of fourth digit '. 19 



Length of fifth digit 15 



Length of the tail, as preserved 62 



Width of tail at base 5 



Width of tail at tip, as preserved-^ 1. 50 



Length of distal vertebra of tail 3-5 



The specimen, a })art of the Lacoe collection, is Cat. No. 4457 of 

 the U. S. National Museum. It was collected by Mr. Samuel Pluston 

 at Linton, Ohio. 



TUDITANUS WALCOTTI, new species. 



Plate G, fig. 1 ; plate 7, fig. 1. 



A small species of Microsauria is jjreserved as a smooth impression 

 on a block of soft coal from Linton, Ohio. Nearly the entire form of 

 the body is discernible. The specimen is especially interesting and 

 valuable as exhibiting for the first time among the Linton forms the 

 sliaj^e of the body of the small microsaurians of the Tuditanus type. 

 It differs so markedly in the form of the skull from others of the 

 genus that it is regarded as new, and the name Tuditanus walcotti is 

 proposed for it as an expression of the writer's indebtedness to the 

 secretaiy of the Smithsonian Institution for the use of the nuiterial 

 among which the jiresent form was included. 



The specimen includes, besides the body impression, the complete 

 skull, a right clavicle with portions of the left, a left humerus, 12 

 cervical and dorsal vertebrae, 10 pairs of ribs somewhat disturbed as 

 to position, and a portion of the mandible. There are no j^ortions of 

 ventral scutellse nor are there any traces of body scales in the smooth 

 impression of the carbonized skin. One would expect at least to find 

 impressions of the ventral scutse in this sj^ecimen if they were present. 

 Cope remarked on the apparent absence of scutellse from members of 

 the genus Tuditanus as they were known to him, and no contrary 



