243 



THE GEOLOGIST. 



species as the last specimen, from the Lias of Lyme Regis, collected 

 by J. Johnson, Esq. ; two large wide-based teeth with prominent 

 central tubercles, from Lias of Lyme Eegis ; very long-pointed broken 

 tooth, Lias, Lyme Eegis ; small slab with thirteen teeth, and a soli- 

 tary tooth of Ichthyosaurus, from Lias, Lyme Eegis : a fine conge- 

 ries of large strong teeth of Hylodus pyramidalis, collected by J. 

 Johnson, Esq., from the Lias of Lyme Eegis ; two small masses of 

 teeth, Lias, Lyme Eegis (Mantell Coll.) : two teeth of H. reticulatus, 

 Lias, Lyme Eegis : isolated back tooth of H pyramidalis, Lias, Lyme 

 Eegis ; five foreign broken teeth of same species, from the Lias of 

 Ohmden, collected by M. P. Mohr; three teeth of Hylodus, collected 

 by Mr. Buy, from the Oxford Clay of Christian Malford, "Wiltshire ; 

 front tooth, Oxford Clay, Christian Malford ; some foreign broken 

 front teeth, from the Bone-bed of Crailsheim, collected by M. P. 

 Mohr; single back tooth of H. raricostatus, labelled " Trias," Aust 

 Cliff, — an assignment we doubt the correctness of. Several front 

 teeth of Hylodus minor, Agassiz, from the Lias Bone-bed at Bristol ; 

 two foreign back teeth of Hylodus plicatilis ?, from the Muschelkalk 

 (? s. J. m.) of Baireuth, collected by M. P. Mohr ; other foreign teeth, 

 assigned to the same species, from Muschelkalk (?) of Baireuth (Mohr 

 and Dr. Braun), Halle (Mohr), Leineck (Dr. Braun), and If. olliquus, 

 Baireuth, Leineck (Braun), (sp.?) Leineck (Braun); H. longiconus 

 Ag., from Bone-bed of Crailsheim (Mohr), H. rugosus, PL, from 

 Bone-bed of Crailsheim and Halle (Mohr), H. sullcevis, Ag., from 

 the Keuper of Wiirtemberg (Dr. Krantz), H. cuspidatus (Krantz), 

 and an unassigned front tooth from the Keuper of Wurtemberg, 

 collected by Dr. Krantz. There are also to be added to the British 

 specimens a small fragment of the Aust CJiff rock, with teeth of 

 Hylodus, and which fragment is referred on the tablet with a query 

 to the " Trias." In addition to these are numerous fin-rays in the 

 wall-case, No. 7, in the North Gallery, referred to various species, 

 but for the present we reserve our remarks on these. 



We regret we cannot go at greater length now into the investigation 

 of this interesting genus. The specimen we have figured, however, 

 is well worthy of accurate description, and on no finer one has any 

 species of Hylodus yet been founded. I propose the specific name 

 of Duhrisiensis for it, and will give in our next number a descriptive 

 summary of distinguishing characters and enlarged figures of the 

 minute teeth, which require more care and delicacy of drawing, and 

 consequently time, than I can possibly at this moment give to them. 



