229 



rpi 



lie (ci'lli (if llic larger class are without inil|)-cavity. The indication 

 of (la- iiKulc ol" siicccs'Sion of the teeth is fmnished hy 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. nepaolica exhiljits the cranium Irom the inner side. 

 Till! frontals arc distinct; the pterygoids and cctopterygoids are displayed, 

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

 the posterior part ol' the palatine bone. Posterior f)arts 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-tem])oral. The supra- 

 occipital projects fitrward in a quadrate plate on the superi(»r cranial surtace, 

 and sends out a high crest from its posterior flice, which bears a l();vsa on each 

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

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

 symplectic. 



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

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

 which, in E. mpcuoUca and E. semianceps (sp. No. 2), present two sliort 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 l)y a vertical lam- 

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

 and, I'orniing a strong rih on the lamina, rises to unite with its liillow. A c(»r- 

 res[)<)nding lamina hounds the ha^nal canal of tin; caudal vertebra, and the 

 hiemapophysis appears as a ril) on its outer side, and then joins the correspond- 

 ing one of the t)pposite side. There arc vcrtebnc 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-prcserv(!d 

 specimen o\' E. ncptwlica. No strong fin-rays can be ccrtaiidy referred to liie 

 genus. The pecloral liny aii^ atlaelied to the lower [>art of the clavicular arch. 

 The body was covereil with very large scales on the side and on the mi<idle 



