412 Prof. H. G. Seeley on Hortalotarsus skirtopodus. 



margins of the ilia, which are thin and diverge as they extend 

 forward. At the left side, somewhat displaced, is the tibia, 

 curved and wide at the proximal end, and at its distal end a 

 part of the proximal end of the metatarsus is exposed, flexed 

 forwards. On the right side the proximal end of the right 

 tibia or femur is seen. Some distance in front of the pelvis 

 ten or eleven dorsal vertebrae are shown in sequence. They 

 appear to be more slender in front than behind, have the 

 centrum somewhat elongated, concave at the sides, and cupped 

 at the articular ends. At the sides are seen transverse sections 

 of the ribs, from which it would appear that the neural arches 

 had perished, together with the parts of the ribs between the 



Fig. 1. 



Skeleton of Hortalotarsus before it was destroyed by blasting. 



centrums and the sections exposed in the rock. Anteriorly 

 are two bones placed laterally, probably the scapulas, and on 

 the right side may be an indication of the humerus. An 

 attempt made to remove the block of slate by a charge of 

 gunpowder scattered the pieces so that they were never found, 

 with the exception of a few small fragments. Two of these 

 Avere entrusted to me ; they promised to show characters of 

 the tibia and fibula. Everything which skill could achieve 

 in removing the matrix has been done for me by Mr. Richard 

 Hall, with the result that, although the specimen is imperfect, 

 it makes an important addition to knowledge of the structure 

 of the tarsus * in animals which have been grouped as Dino- 



* In Ornitbisclna tbe tarsus shows two family types. In Iguano- 

 dontia the ascending intermedium impresses tbe tibia in front. In the 



