Arthur Smith Woodward — British Fossil Crocodilia. 503 



form, a large series of remains, from the Kimmei'idge Clay of 

 Sliotover, are preserved in the Museum at Oxford, and the Professor 

 illustrates both skull and mandible, vertebrse, shoulder girdle, and 

 ischium, besides several limb bones more doubtfully referred to the 

 same animal. M. gracilis w^as founded upon less perfect materials : the 

 type-specimen is a fragmentary skull, discovered by Mr. Wood 

 Mason, and especially interesting on account of its being of Port- 

 landian age. In the same work (p. 319), Prof. Phillips further 

 describes a number of vertebrae from the Oxford Clay of Long 

 Marston, said to agree very closely with those of the Sliotover species ; 

 and it may be added that an anterior portion of a mandible, obtained 

 by Mr. Cunnington from the corresponding beds of Chippenham, 

 and now in the British Museum (No. 46323), undoubtedly belongs 

 to the same generic type. 



The i^resence of Machimosaiirus among British fossils has only 

 once been doubtfully suggested. M. Sauvage ^ thinks it likely that 

 the tooth recorded by Phillips ^ from the Kimmeridge Clay of 

 Hardwick, under the name of GoniophoUs sp., will eventually prove 

 to belong to this genus ; and our pi-eseut information regarding the 

 range of each form renders the suggestion very plausible. 



Another generic type of Kimmeridgian age is the iJakosaurus of 

 Quenstedt.^ Detached teeth closely resembling those described on 

 the Continent are not unfrequently met with in several Kimmeridge 

 Clay localities, but with the exception of certain dei'ived fossils in 

 the- Potton deposits, no British specimens appear to have been 

 definitely identified until 1869, when Mr. Wood Mason* presented a 

 note on the subject to the Greological Society, and Prof. H. Gr. Seeley^ 

 recorded other specimens from the well-known pits near Ely. Some- 

 what later in the same year, Mr. Hulke ^ made known a crocodilian 

 jaw from the typical deposits of Kimmeridge Bay, which exhibited 

 a number of teeth of an undoubtedly similar character, and was 

 associated with vertebras and other skeletal fragments ; in 1870, the 

 subsequent fortunate recognition of the skull of the same individual 

 provided materials for a much more satisfactory study, with the 

 result that the distinguished paleeontologist just mentioned relegated 

 the form to a new species of Steneosaurus — S. Manselii, Hulke — 

 and thus deposed the generic name, Dakosaurus, to the rank of a 



1 H. E. Sauvage, " Memoire sur les Dinosauriens et les Crocodiliens des Terrains 

 Jurassiques de Boulogne-sur-Mer," Mem. Soc. Geol. France, [2] vol. x. mem. ii. 

 (1874), p. 50. It should be noted that the statement in this Memoir, to the effect 

 that Machimosaurus and Gotiiopholis are synonymous, was withdrawn in 1879, on the 

 discovery of more complete remains of the former genus. 



* J. Phillips, op. cit. p. 332. 



3 A. Quenstedt, " Der Jura," 1858, p. 785, pi. 97, figs. 8-11. 



* J. "Wood Mason, "On Dakosaurus from the Kimmeridge Clay of Shotover Hill," 

 Quart. Journ. Geol. Soc. vol. xxv. (1869), pp. 218-220 (with woodcuts). 



* H. G. Seeley, " Index to lleptilia, etc., Woodwardian Museuui," p. 109. 



8 J. W. JHulke, "iSotes on some Fossil Kemains of a Gavial-like Saurian from 

 Kimmeridge Bay, collected by J. C. Mansel, Esq., establishing its identity Avith 

 Cuvier's Detixieme Gavial d' Hoiifleur, Tete a mmeau plus court (iSteiiensiruriis ro.stro- 

 minor of Geoft'roy St.-Hilaire) and with Quenstedt's Dakosaurus,''' Quart. Journ. 

 Geol. Soc, vol. xxv. (1869), pp. 390-400, pis. xvii. xviii. 



