Miscellaneous. . 103 Bornean Rht/nchosuchus Schegelii,SLS also in the form of the palato-nares. From the combination of characters presented by these Crocodiles (which the author regards as representing two species of Goniopholis) and their geological age, the author proposes to place them in an intermediate subgroup, which may be designated Metamesosuchia. MISCELLANEOUS. On the Classification of the Stellerida. By M. C. ViGuiER. In the various classifications of the group Stellerida, authors have chiefly made use of characters furnished by the external skeleton and the various accessory products, spines, granules, &c. which cover it. It appears to me that, without neglecting the data fur-nished by their examination, more precise characters may be derived from the teeth themselves and the internal parts of the skeleton, particularly the interbrachial arches and especially the piece which supports the teeth and which I therefore name the odontophore. The interbrachial arches have been figured in some genera, but the odontophores have never attracted particular attention ; and, finally, it was not known that in the ambulacra of some Stellerida there are circlets of calcareous spicules analogous to those found in Echinoida, although not presenting the same regularity. Such investigations cannot be conclusive unless they apply to a great number of genera. M. Perrier placed at my service all the disposable duplicates of the collection of the museum, and I have also been able to study several types in the living state at M. Lacaze-Dutliiers's laboratory of experimental zoology at Boscofi". I have thus brought together thirty-seven species belonging to twenty-seven genera distributed in the difi'erent families ; and the f oUowiug are the results at which I have arrived. In the first place we recognize the great and profound separation between the Asteriada3 on the one hand, and all the other families of the group on the other. In all the Asteriadae the teeth are absolutely truncated on the mouth-side, and repose by a flat surface upon the odontophore, which is massive and presents on its lower face a double inclined plane in relation to the teeth. The latter, therefore, considering the extent of the surfaces in contact, can have little or no movement. The types examined are Asterias glaciuUs, Stichaster aurantiacus, Pycnopodia helianthoides, and Heliaster helianthus, microbrachia, and Kubinyi. The form of the teeth is the same in all cases, as also that of the odontophore in the first three genera. It therefore does not appear to me possible to separate the genus Pycnopodia from this family, as proposed by Mr. Agassiz, and to approximate it to Solaster papposus, which difters profoundly from it. In the genus Hdiaster the odontophore is cer-
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