BELLEROPHON. 
329 
5. Bbllerophon WfiNLOCKENSis, Sowethij ? 
1841. Belleeophon Wenlockensis ?, Phillips. Pal. Toss., p. 108, pi. xl, 
figs. 203 a, b. 
1854. — HiuLCUS, Morris. Catal. Brit. Foss., p. 288. 
Bemarhs. — Phillips mentioned a small shell from Newton, of which he says 
that there is not sufficient information " to determine its true relation to forms 
which have been described by other authors." " By its semiannular opening and 
partially disclosed umbilicus it may be compared with B. apertus or B. Wenloc- 
kensis. I give it provisionally the latter name." 
I have met with no specimens of this little shell and can, therefore, do no more 
than record Phillips' descriptions. His figures show very little character. Of the 
accompanying shells it appears most nearly to resemble B. macrophthalmus, F. 
A. Romer, but to differ from it by having a more evenly convex back, and I have, 
therefore, not thought it safe to unite them until further evidence of their identity 
be found. 
From B. Uneatus it differs in having a larger umbilicus and no median keel. 
6. Bellerophon imperfoeatds, n. sp. PI. XXXI, figs. 11, 11 a. 
Description. — Shell small, subglobose, horizontally symmetrical. Spire small, 
wholly involute and hidden by the outer whorl. Shell rather wider than high. 
Umbilicus wholly closed. Whorls very convex, rather flattened obliquely above 
and below. Mouth very large, broad and expanding, including the spire, which 
forms a low prominence in its centre. Lips thickened and flattened on each side, 
and rather excavate laterally at the points of the springing of its arch. Surface 
obscured. 
Size. — Height 12 mm. ; width about 14 mm. ; depth 9 mm. 
Locality. — Wolborough. There is a specimen in the Museum of Practical 
Geology ; and another in the British Museum. 
Bemarhs. — This small species cannot be very clearly defined on account of the 
poorness of the specimens. It differs from B. Uneatus in many particulars, as for 
instance in its closed umbilicus, the absence of a keel, and the larger size of 
the mouth ; and from the specimens referred doubtfully to B. Wenlochensis by 
Phillips by its closed umbilicus. 
