229. 



The teeth of the larger class are without pulp-cavity. The indication 

 of the mode of succession of the teeth is furnished by various specimens. 

 The crown of the successional tooth appears in a small excavation on the 

 inner side of the basis of the tooth. The absorption, commencing at this 

 point, no doubt removes the basis, so that the crown falls away. 



A specimen of E. nepozolka exhibits the cranium from the inner side. 

 The frontals are distinct ; the pterygoids and ectopterygoids are displayed, 

 with a series of teeth standing either on the anterior part of the latter or on 

 the posterior part of the palatine bone. Posterior parts of crania of E. 

 nepceolica and E. semianceps show that the muscular tube was not open, and 

 probably did not exist ; although a shallow fossa in the base of the basioccip- 

 ital marks its position. There is no articular surface on the side of the basi- 

 occipital for the extremity of the lower limb of a post-temporal. The supra- 

 occipital projects forward in a quadrate plate on the superior cranial surface, 

 and sends out a high crest from its posterior face, which bears a fossa on each 

 side of the superior base of the crest. In a specimen of E. semianceps, where 

 the quadrate and adjacent bones are well preserved, I cannot discover any 

 symplectic. 



The cervical vertebrae are separate, and not modified in structure. They 

 present large fossae for pleurapophyses on the inferior face, except the first, 

 which, in E. nepceolica and E. semianceps (sp. No. 2), present two short par- 

 allel crests directed downward. The anterior dorsals are marked with narrow 

 grooves and ridges laterally, which finally give place to a nearly smooth or 

 only line-grooved lateral face on the greater part of the column. Posteriorly, 

 deep lateral grooves appear, which extend to the end of the series. Except- 

 ing a short distance anteriorly, the neural canal is bounded by a vertical lam- 

 ina on each side ; the neurapophysis rises from the centrum outside of this, 

 and, forming a strong rib on the lamina, rises to unite with its fellow. A cor- 

 responding lamina bounds the haemal canal of the caudal vertebra, and the 

 haemapophysis appears as a rib on its outer side, and then joins the correspond- 

 ing one of the opposite side. There are vertebrae included in the caudal fin. 



The ribs are well developed, and the abdominal cavity not elongate. 

 Ventral fins are not visible in the abdominal position in the best-preserved 

 specimen of E. nepceolica. No strong fm-rays can be certainly referred to the 

 genus. The pectoral fins are attached to the lower part of the clavicular arch. 

 The body was covered with very large scales on the side and on the middle 



