Vol. 5] 



Goddard 



. — Lower Triassic Fish Remains. 



147 



teeth are covered with coarse longitudinal folds, another char- 

 acter common with Megalichthys. 



The punctate character of the large plate may be considered 

 as pointing rather toward the Osteolepidae than to Megalichthys. 



The following specimens show characters which are considered 

 worthy of notice. 



Specimen No. 10823. — This is a fragment of jaw (fig. 1) 65 

 mm. in length and 12 mm. in width containing eight distinguish- 

 able teeth, one of which shows a length of 5 mm. With one ex- 

 ception, the teeth are shown in cross-section only. They average 

 2.5 mm. by 3.5 mm. in diameter and show distinctly a deep pli- 

 cation at the base, the folds of dentine extending into the pulp 

 cavity almost to the center. The external part of the tooth shows 

 deep longitudinal folds for about one-third of the distance from 

 the base to the apex. The teeth are set firmly in the bone. 



This specimen very much resembles the members of the Rhizo- 

 dontidae, as described by Woodward, 3 in their conical form and 

 vertical folding of the walls of the pulp cavity towards the base. 

 There is also a resemblance to the Osteolepidae 11 which have 

 "teeth conical, with a pulp cavity, of which the walls are not 

 folded except quite at the base. ' ' 



Specimen No. 9991. — Figure 2 probably represents a dentary 

 bone bearing four teeth of different sizes, three of which are 

 almost in direct alignment ; the other, a smaller one, lies at 

 the side. No. 1, the smallest, has a length of 7 mm., diameter at 

 the base 3.8 mm. It has a conical form and a large pulp cavity 

 reaching almost to the apex, and well down into the base, which 

 is set firmly in the bone. No. 2 is the base of a conical tooth with 

 external longitudinal folds. No. 3 is a long tapering tooth with 

 coarse longitudinal folds extending almost to the apex and having 

 a length of 12 mm. and a diameter at the base of 5.8 mm. No. 4 

 is a large tooth having an approximate length of 14 mm. and a 

 diameter at the base of 8 mm., with very large coarse longitudinal 

 folds from base to apex. 



5 Woodward, A. S., Catlg. Fos. Fish. Brit, Mus., Vol. II, p. 341. 

 ,; Ibid., p. 367. 



