CESTRACIOXTim®. 
315 
1843. Strophodus favosus, L. Agassiz, tom. cit. p. 175 (name only). 
t 1871. Strophodus magnus, J. Phillips, Geol. Oxford, p. 177, diagr. xxxvii. 
Jig. 7. 
188-5. Strophodus favosus, A. S. Woodward (ex Agassiz), Science 
Gossip, p. 107, fig. 78. 
(P) 1886. Strophodus rigauxi , H. M. Platnauer, Ann. Rep. Yorkshire 
Phil. Soc. p. 36, pi. i. figs. 1, 2. 
Type. Detached teeth. 
Crown of all the teeth gently rounded, those anterior in position 
exhibiting little or no traces of a longitudinal keel; coronal surface 
finely reticulated, the more prominent markings becoming straight, 
parallel, and directly transverse upon the longer margins. In the 
most posterior series the teeth are small and oval, with very coarse 
superficial reticulations (PI. XY. fig. 8) ; the teeth presumably of 
series no. iv. are relatively broad and flat (PI. XY. fig. 7) ; those of 
no. hi. somewhat longer, the postero-lateral angle gently upturned, 
and the anterior third of the tooth slightly bent forwards and down¬ 
wards (PI. XY. fig. 6). The teeth assumed to belong to series no. n. 
are broadest posteriorly, with an abrupt hinder margin, the antero¬ 
lateral angle produced and the postero-lateral angle rounded 
(PI. XY. fig. 5) ; and the teeth of the most anterior paired series 
are still smaller than those of no. ii., and apparently shorter 
(PI. XY. fig. 4). 
Xo median symphysial tooth is recognizable in the Collection. 
- Form. Sf Log. Inferior Oolite: Lincolnshire. Bathonian: Ox¬ 
fordshire, Northamptonshire, Gloucestershire, Somersetshire, Wilt¬ 
shire, and X. France; Onr-y^^ f A 
(i.) Inferior Oolite. 
47441. Seven teeth of the principal series ; Upper Beds of the Lin¬ 
colnshire Limestone, Stamford, Lincolnshire. 
Sharp Coll. 
(ii.) Stonesfield Slate , Stonesfield, Oxfordshire. 
26010 a. Much abraded tooth of series iv. Dixon Coll. 
28599, Xine teeth of series i.-iv.; Eyeford, near Stonesfield. 
Purchased , 1853. 
33200. Unabraded tooth of series in. Hastings Coll. 
33472. Ten flat teeth, more or less abraded. Purchased , 1858. 
P. 2116-7. Thirteen flat teeth, some extremely abraded, labelled 
in Agassiz’s handwriting. Egerton Coll. 
P. 2561. Eleven flat teeth, slightly abraded. Enniskillen Coll. 
