142 



S. W. WILLISTON 



yet with the sacrum and pelvis. Six are united in a series lying over 

 the pectoral girdle, with ribs or portions of ribs attached. In addition, 



there are two united 

 pairs, and two single ver- 

 tebrae. Between the two 

 series there are quite evi- 

 dently several missing, 

 since the diapophyses 

 end abruptly with the 

 pectoral series. From 

 the size and shape it 

 seems apparent that the 

 two pairs belong here, 

 making at least fourteen 

 dorsals. Both of the 

 single vertebrae have 

 small rib diapophyses ; 

 they are also smaller in 

 size. I have placed them 

 in the neck in the res- 

 toration (Fig. 6). How- 

 ever, Lahidosaurus ha- 

 matus has, according to Broili,' at least twenty-two presacral verte- 

 brae ; and Telerpeton, according to Boulenger,^ twenty. It is probable, 

 hence, that two or more vertebrae have been lost in the present 

 specimen from in 

 front of the sacrum. 

 The neck could not 

 have been longer 

 than is represented 

 in the restoration, 



perhaps not so Ion? Fig. 3. — Mandible and maxillary teeth of Lahidosaurus 



111 incisivus, one-half natural size. 



smce so broad and 



ungainly a head would have been sadly unmanageable on a slender 



neck. At least four presacral vertebrae bore no ribs, but I believe 



1 Paleontographica, 1904. 



2 Proceedings of the Zoological Society, London, 1904, p. 474. 



Fig. 2. — Lahidosaurus incisivus, under surface 

 of skull; one-half natural size. Ft, pterygoid; Bs, 

 basisphenoid. 



