SCOMBRTDiE. 
467 
Cybium excelsum, sp. nov. 
[Text-figure 15.] 
Type. Remains of head ; British Museum. 
A very large, imperfectly known species, with skull nearly 0 - 4 in 
length. Teeth broad and much laterally compressed, not very 
variable in size, those of front portion of promaxilla scarcely smaller 
than the anterior mandibular teoth. Anterior end of premaxilla 
more deepened and less attenuated than in the next species ; the 
w holo premaxilla probably longer in proportion to its depth than 
ln the Eocene Cybium bleekeri. 
Form,. <$- Loc. Upper Eocene (Barton Clay) : Barton Cliff, Hamp- 
shire. 
1528. Associated remains of head and vertebral column in very 
friable condition. This is the type specimen, and was 
discovered by Barbara. Marchioness of Hastings, in Barton 
Cliff. So far as it can be compared, the skull resembles 
that of Cybium. Both premaxillae are imperfectly pre- 
served, and that of the right side is shown from the outer 
aspect, of two thirds the natural size, in fig. 15 a. The 
left dentary bone is more fragmentary, but its symphysial 
end, shown in fig. 15 b, bears two teeth. The centrum of 
the first vertebra is distinguishable, and portions of other 
typical centra occur among the remains. Egerlon Coll. 
Cybium bartonense, sp. nov. 
[Text-figure 16.] 
Type. Portions of jaws ; British Museum. 
A very large species known only by the jaws, with mandible 
about 0-45 in length. Teeth broad and much laterally compressed, 
those of front portion of premaxilla considerably smaller than the 
anterior mandibular teeth. Anterior end of premaxilla less 
deepened and more attenuated than in C. excelsum and C. bleekeri. 
Symphysial end of mandible relatively deeper than in C. bleekeri 
an d C. lingulatum. 
Form. £f Loc. Upper Eocene (Barton Clay): Barton Cliff and 
Sigh Cliff, Hampshire. 
E. 53. Associated remains of jaws and two anterior vertebrae, the 
type specimen near Christchurch, Hampshire. The 
anterior end of the right premaxilla is shown of two 
thirds the natural size, from the outer aspect, in fig. 16 a, 
2 h 2 
