Vol. 60.] RH.ETIC OF THE SOUTH-WALES DIRECT LINE. 209 



fragment of bone belonging to Mr. W. H. Wickes (to whom we 

 are greatly indebted for the opportunity of examining a large 

 collection of Rhaetic Bone-Bed material from Sodbury) shows the 

 peculiar pustulated surface seen in a fragment of bone figured 

 by Meyer & Plieninger 1 as part of the breast-bone of a laby- 

 rinthodont, and also in many fragments of bone of undoubtedly- 

 labyrinthodont origin in the British Museum (Xatural History) 

 and elsewhere. But, on the other hand, this character occurs in 

 bones labelled Hybodus in the Stuttgart collection, and in a jaw 

 of Sauriclithys figured by Dr. Smith Woodward. 2 In connection 

 with the latter specimen, attention may be drawn to Mr. Mon- 

 tagu Browne's suggestion, 3 that jaws bearing teeth of two kinds, 

 which have been described as Saurichthys, may really belong to 

 labyrinthodonts. 



Pisces. 

 Elasmobranch ii. 



Hybodus cloacinus, Qnenstedt. — Teeth agreeing closely with 

 Quenstedt's figure 4 occur somewhat sparingly. The large fin- 

 spines, described by Mr. J. "W. Davis ' under the name of Hybodus 

 austieusis, are fairly common, though always in a fragmentary state 

 and generally much rubbed. We follow Dr. Smith Woodward & 

 Mr. Sherborn in considering that they are best provisionally referred 

 to Hybodus cloacinus. Mr. "W. H. Wickes obtained an example of 

 the curious cephalic dermal spines of Hybodus, described bv 

 Agassiz 6 under the name of Sphenonchus. 



Hybodus minor, Ag. — One small tooth, with a high, slender, 

 median cone, is probably to be referred to this species. 



Acrodus minimus, Ag. — The teeth of a small species of Acrodus 

 occur in thousands, but always detached. They and the teeth of 

 Saurichthys are the two commonest fossils in the Bone-Bed at 

 Sodbury, just as they are at Aust and probably all the other 

 Rlmetic Bone-Bed localities in the Bristol district. They show 

 a considerable amount of variability, but are at present, no doubt, 

 all to be included under Acrodus minimus. 



Small, deeply-biconcave, vertebral centra, 4 to 5 millimetres in 

 diameter, occasionally occur, as they do at Aust and Emborough. 

 Apparently they have not yet received a name. 



Dipnoi. 



dratodus latissimus, Ag. — Ceratodus-teeth are not uncommon at 

 Sodbury, though less plentiful than at Aust. They are grouped in 

 the comprehensive species C. latissimus=G. polymorphus, Miall. 



1 ' Beitriige zur Palaont. Wiirtt' 1844. pi. ix, fig. 8. 

 - Aun. & Mag. Xat. Hist. ser. 6, vol. iii (1889) pi. xiv. 



3 Eep. Brit. Assoc. 1894 (Oxford) pp. 657-58. 



4 ' Der Jura' 18.*8, pi. ii, fig. 15. 



5 Quart. Journ. Geol. Soc. vol. xxxvii (1881) p. 416 & pi. xxii, fig. 1. 

 • Poiss. Foss.' vol. iii (1833-43) p. 201. 



Q. J. G. S. No. 238. r 



