. Memoirs and proceedings of the Manchester Literary & Philosophical Society . impossible to dis-tinguish between the matrix and the bone, to which itvery tightly adheres. The two projections, which havebeen supposed to mark the position of the anterior edgeof the posterior nares, are really formed by the crushingthrough of the descending processes of the pre-frontais,which articulate with the anterior ends of the pterygoids. Manchester Mcinoirs, Vol. h. {igw), No. l^. ii Their position favours this suggestion, and they can beexactly paralleled in crushed skulls of Mystriosanrus. There is henc
. Memoirs and proceedings of the Manchester Literary & Philosophical Society . impossible to dis-tinguish between the matrix and the bone, to which itvery tightly adheres. The two projections, which havebeen supposed to mark the position of the anterior edgeof the posterior nares, are really formed by the crushingthrough of the descending processes of the pre-frontais,which articulate with the anterior ends of the pterygoids. Manchester Mcinoirs, Vol. h. {igw), No. l^. ii Their position favours this suggestion, and they can beexactly paralleled in crushed skulls of Mystriosanrus. There is hence no reason for separating the skulldescribed as Petrosnchus laevidens from Macrorhynchus,which Koken holds to be synonymous with Pholidosaiirus,H. V Meyer, which has priority. All the skulls of PJiolidosaurns have a very elongatedrostrum, being of gavialoid proportions. The Petrosuchusskull is damaged anteriorly, so that no direct evidence ofits length is possible. The lower jaw, which Owen theoretically associatedwith the skull, is quite short, and seems to shew that the. —o o o o ^rTr^Q-Q-To—Q Fig. 4. I^ower jaw of Pholidosaurus ? decipietts, from tlie^liddle Purbeck of Swanage. x \. symphysis was short, only some 2 or 3cms. in jaw, in the posterior part not figured by Owen, hasan ornament of deep rounded pits like those on aGoniopholis scute. The skull shews only a very faintornament of irregular shallow grooves, even the frontalnot bearing any deep pits. It is, in fact, certain that the skull and lower jawdescribed as PetrosiicJms laevidens have nothing whateverto do with one another. There is in the ManchesterMuseum a portion of the right ramus of the lower jaw ofa crocodilian from the Middle Purbeck of Swanagewhich agrees closely with that figured by Koken forPholidosaurus scliaumbersrensis. The ornament of this 12 Watson, Notes on some British Mesozoic Crocodiles. jaw is similar to that of the PetrosucJms skull, and itappears to correspond in curve. The
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