Medical and physical researches, or, Original memoirs in medicine, surgery, physiology, geology, zoology, and comparative anatomy . the Ichthyosaurus, but is separated from this genus of ani-imals by the peculiarities expressed above. We proposeto distinguish this animal by the following name and cha-racters. SAUROCEPHALUS lanciformis. Generic characters.—Bodies of the teeth approximated;those of the superior and inferior jaws closing like inci-sors. Inferior maxillary nerve passing along a groove onthe mesial aspect of the dental bone. Specific characters.—Projecting portions of the teethsmoo
Medical and physical researches, or, Original memoirs in medicine, surgery, physiology, geology, zoology, and comparative anatomy . the Ichthyosaurus, but is separated from this genus of ani-imals by the peculiarities expressed above. We proposeto distinguish this animal by the following name and cha-racters. SAUROCEPHALUS lanciformis. Generic characters.—Bodies of the teeth approximated;those of the superior and inferior jaws closing like inci-sors. Inferior maxillary nerve passing along a groove onthe mesial aspect of the dental bone. Specific characters.—Projecting portions of the teethsmooth and lanciform.* * We are informed by Mr. Matitell of Brighton, England, that the Saurocepha-lus lanciformis and S. leanus, have also been found in the Sussex chalk. June 1-835. i) EXPLANATION OF THE PLATE. Fig. 1. Tooth detached. // 2. Teeth in their sockets The young tooth. 3. The dental bone, mesial aspect ^ ^*^ 4. dermal a. articulating surface. 5. Dental bone seen from above. n. NEW EXTINCT FOSSIL SPECIES. 367 Description of a new Fossil Species of an Ichthyosaurian Animal. Soon after writing my last paper on the Saurocepha-lus, my attention was directed to a small fragment ofpetrified bone, deposited in the collection of British fossilsin the Philadelphia Museum. This specimen was originally from Bath or Bristol, andis easily recognised, at first view, for a portion of the den-tal bone of some Saurian reptile; though from the smallsize and crushed state of the specimen, and from its being,in some degree, imbedded in a matrix of Calp, it was atfirst difficult to ascertain to what genus it belonged. Nevertheless, an attentive examination of this portionof dental bone, a little more than an inch in length, andcontaining six teeth, enabled me eventually to ascertainthe following facts. The remnant is six-tenths of an inch high, and five-tenths broad at the alveolar aspect. The largest teeth(for they vary in size) are .65 of an inch long, projectin
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