VOL. XX. (3) 
DIBRAXCHIATE CEPHALOPODA 
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of Whitby the species has been recorded in 1855 by Martin 
Simpson (as Sepia haustrum and possibly also as Sepia obtusalis) 
and in 1876 by Professor J. F. Blake (as Geoteuthis coriaceus). 
T euthopsis, Deslongchamps. 
The members of this genus possessed a gladius which 
was thin, spoon-shaped, expanded and rounded posteriorly, 
produced anteriorly into a narrow handle, and somewhat 
convex outwardly. A strong meridian keel begins at the 
hinder end and increases in breadth and strength towards 
the anterior end. The broad lateral portions are ornamented 
-with growth-lines parallel to the margins of the gladius. The 
expansion of the posterior portion is rather sudden, and can 
be traced by the growth lines from near the posterior end 
of the specimen to the margin of the pen, and along the course 
thus indicated by this sudden bending of the growth-lines 
the surface of the gladius is very slightly depressed. 
T euthopsis brunelii, Deslongchamps. 
An excellent example of this genus from the Upper Lias 
of Alderton, Gloucestershire, has been brought under my 
notice by Mr. L. Richardson (plate B). It is displayed on 
the surface of a portion of a nodule, and exhibits the greater 
part of the dorsal aspect of the gladius. There are only a few 
fragments of the outer layer of the pen, but the general form 
of the gladius is well shown, the specimen being uncrushed and 
not split at the posterior end as is the case in most examples of 
the genus. 
The fossil, which is not quite complete anteriorly, is 67 mm. 
long as measured along the median line. 
The posterior portion is truncated oval in outline. It 
is about 40 mm. long, and has its greatest width of 31 mm. 
at a point about 30 mm. from the obtusely-pointed posterior 
boundary, whence it narrows gradually to a width of 24 mm. 
at about 40 mm. from the posterior end ; the posterior pointed 
extremity of the shell is not visible, this being turned towards 
the vestral surface is doubtless buried in the matrix. The 
anterior portion of the gladius is lanceolate, its margins nearly 
straight or only very slightly waved and converging at an angle 
