SEMIONOTIDUS. 
107 
.XXV111. 
1885. Lepidotupn aximus , F. Bassani, Atti Soc. Ital. Sci. Nat. vol.: 
pp. 80, 154, pi. ii. a. figs. 12, 13.j 
1889. Lepidotus maximus , Etheridge & Willett, Quart. Journ, Geol. 
Soc. vol. xlv. p. 356, pi. xy. 
Type . Detached teeth; Museums of Oxford, Paris, and Stuttgart. 
The type species of the so-called genus Sphcerodus, attaining a 
length of probably not less than 2 metres, but known only from 
fragments. Teeth very broad and gently rounded, except towards the 
margin of the upper jaw, where they become obtusely conical; teeth 
of mandible relatively large and arranged in four or five irregular 
concentric series. Principal flank-scales with a few broad ridges and 
furrows radiating from the centre to the hinder border, where they 
form feeble indentations ; superficial layer of ganoine comparatively 
thin, sometimes discontinuous, sometimes with few granulations. 
This species as yet is only clearly distinguished from Lepidotus 
pdlliatus by the characters of the mandibular dentition, and some 
of the fragments entered above under the last-named species may 
belong to L. maximus. 
Form. <Sf Loc. Upper Corallian: Wiirtemberg. Eimmeridgian : 
S. England, N. France, Switzerland, Tyrol, and Sicily. Portlandian : 
France, Italy, and Germany. Neocomian: Cambridgeshire, Berk¬ 
shire, and Bedfordshire ( derived ) ; Haute Marne, France ; Switzer¬ 
land. 
P. 6723. Imperfect right splenial showing the arrangement of the 
dentition, with successional teeth, noticed in Quart. Journ. 
Geol. Soc. vol. xlv. p. 357, no. iii.; Kimmeridge Clay, 
Shotover, near Oxford. 
Presented by Henry Willett, Esq., 1892. 
P. 6724. Tooth with successor, in transverse, seption, figured Jbid. x 
pi. xv. fig. 3 ; Shotover. 
Presented by Henry Willett, Esq., 1892. 
P. 1677, P. 4658. Detached teeth; Tithonian formation, Trient, 
Tyrol. Eyerton <$f Enniskillen Colls. 
22482-83, 22488, 28506, 32754, 36148. Several detached teeth; 
Corallian, Schnaitheim, Wiirtemberg. 
Purchased, 1847, 1848, 1859. 
36148 a. Two abraded teeth associated with two successional teeth, 
each of the latter exhibiting a minute central coronal 
tubercle; Schnaitheim. Purchased, 1859. 
P. 1679. Plaster cast of imperfect left palatine dentition : Upper 
Jurassic, Switzerland. Eyerton Coll. 
