248 
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 Syhodus pyramidcdis, collected by J. 
Johnson, Esq., from the Lias of Lyme Eegis ; two small masses of 
teeth, Lias, Lyme Eegis (Mantell Coll.) : two teeth of K. reficulatus, 
Lias, Lyme Eegis : isolated back tooth of S. pyramidalis, Lias, Lyme 
Eegis ; five foreign broken teeth of same species, from the Lias of 
Ohmden, collected by M. P. Mohr; three teeth of Hyhodiis, 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 
Clifi", — an assignment we doubt the correctness of Several front 
teeth of Syhodus minor, Agassiz, from the Lias Bone-bed at Bristol ; 
two foreign back teeth of Hyhodus 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 H. ohliquits, 
Baireuth, Leineck (Braun), (sp.?) Leineck (Braun); S. longiconus ?, 
Ag., from Bone-bed of Crailsheim (Mohr), B. rngosus, PL, from 
Bone-bed of Crailsheim and Halle (Mohr), H. suhlcevis, 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 Ciifl' rock, with teeth of 
Syhodus, 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 Syhodus 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. 
