OEXITHOSAURIAX AND DINOSATJRIAN EEMAINS. 43 



propose that Ccdcnnospondylus Foxi should henceforth be known as 

 Calamosaurus Foxi. 



These two associated vcrtcbraD, which belong to the cervical 

 region, indicate a Dinosaur referable to the Theropodous family 

 Cceluridce, all the members of which are characterized by the 

 extremely pneumatic structure of the skeleton, as is especially 

 shown by the cervical vertebrae. The cervicals of Calamosaurus 

 differ from those of Coelurus (represented in the "VVealden by 

 C. Dav'iesl) in being shorter, and also in that all were probably 

 opisthocoelous, the middle and posterior cervicals of the type genus 

 being amphicoclous *. Since the woodcut in which one of the 

 vertebrte of Calamosaurus was figured in the original description is 

 on a reduced scale, and is not altogether satisfactory, two views of 

 this specimen are given of the full size in Plate V. figs. 1 a, 1 6. It 

 may be mentioned that these vertebrae are of a characteristic brown 

 colour, evidently indicating that they were obtained from a bed of 

 the AVealden different from that which yielded the types of Coelurus 

 Daviesi and AristosucJius pusillus, all of which are stained of a deep 

 black colour. 



Hitherto the above-mentioned vertebrae are all that have been 

 known concerning Calamosaurus. During his recent visit to the 

 ]N^atural- History ^Museum Professor Marsh called my attention to 

 the right tibia (B. M. j^o. E.. 186) of a small Dinosaur obtained by 

 the late Mr. Fox from the Wealden of the Isle of Wight, which 

 has been incorrectly referred to HypsilojoJiodonf. This specimen 

 was at once identified by my friend as referable to some member of 

 the family Cceluridce ; and on careful examination it is at once seen 

 to have nothing whatever to do with the Iguanodonticlce. This 

 bone, of which two full-sized figures are given in Plate V. figs. 2 a, 

 2 b, is of the same brownish hue characteristic of the vertebrae of 

 Calamosaurus, and was therefore probably derived from the same 

 bed. Its total length is G-1 inches. Its Theropodous characters are 

 shown by the highly polished and dense nature of the outer surface, 

 by the long and sharp fibular ridge (/) on the outer border qi, by 

 the extreme flattening of the distal half, and, above all, by the large 

 facet at the distal extremity of the anterior surface (fig. 2 «, as.\ for 

 the articulation of the ascending process of the astragalus, the 

 inner border of that facet terminating in a very sharp ridge. There 

 is also the absence of the division of the distal extremity into two 

 " steps." Where the specimen has been fractured the very large 

 size of the central cavity may be seen. 



It appears to me probable that this bone is of rather too small a 

 size to have belonged to the same individual as that to which the 



f^ lu Coelopki/sis, of tbe Trias of New Mexico, all the cervicals were ainphi- 

 codIous. 



t See ' Cat. Foss. Rept. & Amphib. Brit. Mus.' part i. p. 19-1. The whole 

 of the four tibia? mentioned on that page are referred to the wrong side; 

 those marked right being left, and vice versa. 



I This is absent in the Iguanodontid(B\ see Huxley, Quart. Journ. Geol. 

 Soc. vol. xxvi. p. 19. 



