NO. 1696. AIR-BREATHING VERTEBRATEf<—MOODIE. JQ 



tanus. It is very slender and of uniform width so far as preserved. 

 The teeth are short, bhmt cones, apparently pleiirodont. 



The clavicle is of the tyj^ical Tuditanus form, Avith the sculptur- 

 ing lines radiating out from the angle. The impression of the body 

 adds nothing to that already described for the type-specimen. The 

 nearly entire hind limb is of great interest as adding another ex- 

 ample of the phalangeal formula. The foot is almost perfectly pre- 

 served, and the formula was probably 2-2-8-3-2. The endochon- 

 drium of the limb bones is not highly developed. About a dozen 

 vertebrae are represented by molds in the soft coal, but nothing of 

 their structure can be determined. 



The sharp, reptile-like claws in which the toes end recall those of 

 Isodectes and of Tuditanus miniinus Moodie. It is another link in 

 the chain of the suggested relationship between the microsaurians 

 and the early reptiles. 



Measurements of the second specimen of Tuditanus ivalcotti Moodie. (Cat. 



No. J,.',81, U.S.N.M.) 



mm. 



Length of entire body impression 75 



Width across belly, maximum 16 



Length of sliull ? 17 



Posterior width of skull ? 14 



Length of fragment of jaw 4 



Width of fragment of jaw 1.5 



Length of tooth in jaw .25 



Length of clavicle 8 



Width of clavicle, maximum 4 



Length of hind limb 22 



Length of femur 8 



Length of tibia ( ?) 6 



Length of metatarsal 2 



Length of first digit 6 



Genus ODONTERPETON, new genus. 



The generic characters may be found in the triangular shape of the 

 skull, the large size of the teeth, the shape of the vertebrtie, the small 

 size of the orbits and their anterior position as shown in the tj-jse. 



The name of the genus is derived from the remarkable size of the 

 teeth compared with the size of the skull, and it was through them 

 that the specimen was first recognized as a skull. 



Genotype. — Odonterpeton tnangularis. 



ODONTERPETON TRIANGULARIS, new species. 

 Plate 6, fig. 3. 



By this name may be known the smallest of all microsaurians 

 ihitherto described. Ortliocosta microscopica Fritsch, from the Car- 

 boniferous of Bohemia, is a rival of the present form as to size, but 

 ithe form described b}^ Fritsch belongs among the Aistopoda, while 

 the present form shows clear affinities with the Microsauria. 



