272 



SUPPLEMENT TO THE EXTINCT BATKACIIIA 



than in any other species. The under jaw of the right side is partially preserved, and displays longitudinal grooves. 

 The ramus is stout aud straight, and approaches the form seen in Brachydectes newherryi. Its teeth are not pre- 

 served, hut the extremities of the opposing maxillaries remain/ They are small aud acutely conic ; both they and 

 the ramus are much less robust than in the above mentioned species, and the enamel preserved is smooth. 



The three pectoral shields are preserved, and as the exijosed surface is the interior it is smooth. The laterals 

 resemble imperfectly, spherical triangles. The outer margin is thin and convex, and the anterior angle curves round 

 the apex of the median shield and joins that of the opposite side forming a coarse interlocking suture. The median 

 scute is formed like some of the patterns of ancient mirrors. It is a wide oval excavated on each side behind, and 

 produced from between these concavities into a long flat sternum-like process. The latter thus resembles the 

 xiphisternal production of frogs and of some lizards ; as in the formei', the i-ibs having no hiemal elements, have no 

 connection with it. Its extremity is simple and obtuse. 



The 7iu7nerus originates at the outer posterior angle of the lateral thoracic scutum. It is relatively as large as 

 that of a frog, is contracted medially, and much expanded distally. It is followed at a short interval by a shorter 

 ulna, which is also expanded at the ends and contracted at the middle. Then succeed numerou.s well developed 

 phalanges, which are so scattered as to render it impossible to ascertain the number that compose the digits and 

 how many of the latter existed. 



The vertebrcB are osseous and with slightly concave extremities on a lateral view ; they are subquadrate in 

 outline ; their spines are not distinguishable. There are 22-3 pairs of osseous ribs, which are slender, rather short, 

 and strongly curved backwards. 





Measurements. ■ 





M. 



Length of specimen as preserved. 







0.097 



" head, 







.034 



Width of head posteriorly. 







.020 



Dejith of ramus mandibuli, 







.004 



Eight apices of teeth cover. 







.005 



Length of 23 vertebras. 







.062 



" median pectoral scute. 







.010 



Width " " " 







.005 



" of the three scuta. 







.010 



Length process of median scute, 







.005 



" humerus. 







.009 



Width 







.004 



Length ulna, 







.006 



Width 







.003 



Length phalange. 







.003 



Expanse of longest ribs, 





* 



.015 



Length of a long rib. 







.009 



Besides the generic characters already pointed out, this species differs from the Sauropleura longipes, to which 

 it has some resemblance, in the much shorter fore limbs, and shorter vertebral column in the anterior region of the 

 body. 



TUDITANUS BREVIROSTRIS, Cope, Sp. Nov. 



Eepresented by two individuals and probably by part of a third. Those with the cranium show that this part 

 is large in comparison with the size of the body, and is as wide as long, with broadly rounded muzzle. The orbits 

 are large, and situated for the greater part in front of a line marking the anterior third of the length of the head. 

 The bones of the head are coarsely sculptured with radiating ridges, and with some tubercles posteriorily ; the 

 supratemporal exhibits radii which extend outwards. The teeth are in two rows on that part of the maxillary arch 

 anterior to the orbits ; they are of equal sizes ; the outer row appears to be directed more obliquely outwards than 

 the inner. The former number five in .003 M. The thoracic shields are rather large, and have coarse radiating 

 ridges. 



