442 ON THE SKELETAL ANATOMY OF THE MESOSUCHIA. [NoA. 20, 



34. Marsh, O. C— Principal char. Amer. Dinos. Part vi. Am. 



J. Sc. vol. xxvi., Aug. 1883, pp. 82-83. 

 3.T. DoLLO, L. — Cinquieme note. Bull. Mus. Eoy, Hist. Nat. 



Belg. t. iii., 1884, pp. 129-13.5. 



36. Hoffmann. ^ — Reptilien. Bronn's Klassen. 



37. Seeley, H. G. — On the Bone in Crocodilia which is commonly 

 regarded as the Os Pubis. Proc. R. Soc. vol. xliii. no. 261, 

 p. 23.5, Dec. 1887. 



38. Owen, R. — Brit. Foss. Rept. 

 3y. Seeley, H. G. — Loc. cit. p. 



40. QuENSTEDT. — Sonst uud Jctzt. 1856. 



41. Fraus. — Paleonfogr, Bd. xxv. oder iii. Folge Bd. 1. Lief. 4, 



1878. 



42. ZiTTEL. — Ramph. Germ. Paieontogr. Bd. xxix. iii. F. v. 

 Taf. xii. fig. 2. 



43. Baur, Dr. G. Amer. Nat., 1887. 



44. KoKEN. — Die Rept. d. N. Deutsch. Kreidcr. Z. d. deutsch. 

 geol. Gessell., 1883. 



4.5. D'Alton and Burmeister.^ — Foss. Gav. v. Boll. 



Since writing the above, my attention was lately most kindly 

 called to some remains of Geosaurus in the Nat. Hist. Mus., Crom- 

 well Road, by Mr. Lydekker, who at the same time pointed out to 

 me such close structural correspondences between these and certain 

 INIetriorhynchian remains from the Oxford Clay, collected by 

 Mr. Leeds, identical with those here described, as are suggestive of 

 a very near affinity between these Saurians. 

 Oct. 27, 1888. 



EXPLANATION OP THE PLATES. 

 Plate XVIII. 

 Meiriorhjiichics. 

 Fig. 1. Side view of synostosecl atlas and epistropheus (axis), d', diapo- 

 physis of axis ; d, diapojiliysis of atlas. 



2. Anterior view of a cervical vertebra. d, diapophysis ; p, parapo- 



pbysis; pr;:, prezyapophysis ; p)sj, postzygapopbysis. 



3. Anterior yiew of trunk vertebra. 



4. Posterior view of second sacral vertebrre. 



5. Caudal vertebra. 



Steneosam'us. 



6. Side view of epistropbeus. 



PL.4TE XIX. 



Mctriorhynchus. 

 Fig. 1. Ilium ; left, outer view, pa, preacetabular process ; a.i, anterior 

 iscbiatic process ; p.i, posterior iscbiatic process ; s, s, sacral impres- 

 sions ; u, upper border ; a, acetabular hollow. 

 2. Inner view of same bnne. 



Stcncosmtrus. 

 " 3. Ilium ; left, outer view. Lettering as in figs. 1 and 2. 



4. Inner view of same bone. 



5. Ischium. «, anterior border ; //«, mesial gymphysial border. 

 0. Os pubis. 



