Proceedings of the Scientific Meetings of the Zoological Society of London 1888

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442 ON THE SKELETAL ANATOMY OF THE MESOSUCHIA. [Nov. 20, 34. MARSH, O. C-Principal char. Amer. Dinos. Part vi. Am. J. Sc. vol. xxvi., Aug. 1883, pp. 82-83. 35. D O L L O , L.-Cinquieme note. Bull. Mus. Roy. Hist. Nat. Belg. t. iii., 1884, pp. 129-135. 36. HOFFMANN.-Reptilien. Bronn's Klassen. 37. S E E L E Y , H. G . - O n the Bone in Crocodilia which is commonly regarded as the Os Pubis. Proc. R. Soc. vol. xliii. no. 261, p. 235, Dec. 1887. 38. O W E N , R.-Brit. Foss. Rept. 39. S E E L E Y , H . G.-Loc. cit. p. 40. QUENSTEDT.-Sonst und Jetzt. 1856. 41. FRAUS.-Paleontogr. Bd. xxv. oder iii. Folge Bd. 1. Lief. 4, 1878. 42. ZITTEL.-Ramph. Germ. Paleontogr. Bd. xxix. iii. F. v. Taf. xii. fig. 2. 43. BAUR, Dr. G. Amer. Nat., 1887. 44. KOKEN.-Die Rept. d. N. Deutsch. Kreider. Z. d. deutsch. geol. Gessell., 1883. 45. 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., Crom­well Road, by Mr. Lydekker, who at the same time pointed out to me such close structural correspondences between these and certain Metriorhynchian 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 OF THE PLATES. PLATE XVIII. Metriorhynchus. Fig. 1. Side view of synostosed atlas and epistropheus (axis), cl1, diapo­physis of axis; d, diapophysis of atlas. 2. Anterior view of a cervical vertebra. d, diapophysis; p, parapo­physis ; prz, prezyapophysis ; psz, postzygapophysis. 3. Anterior view of trunk vertebra. 4. Posterior view of second sacral vertebras. 5. Caudal vertebra. Steneosaurus. 6. Side view of epistropheus. PLATE XIX. Mctriorhyn ch us. Fig. 1. Ilium; left, outer view, pa, preacetabular process; a.i, anterior ischiatic process ; p.i, posterior ischiatic process ; s, s, sacral impres­sions ; u, upper border ; a, acetabular hollow. 2. Inner view of same bone. Steneosaurus. o. Ilium ; left, outer view. Lettering as in figs. 1 and 2. 4. Inner view of same bone. 5. Ischium, a, anterior border; m, mesial symphysial border. 6. Os pubis.