178 
THE REPTILES OF LEICESTERSHIRE AND RUTLAND. 
struck him as likely to be the integument, but my further examination revealed 
the more important fact, that the posterior margin of the paddle was furnished 
with muscular striai or fin-rays of some length (if the latter, probably carti- 
laginous) running from the phalanges. Kecognizing the importance of this 
unknown feature in the anatomy of the Ichthyosauridce, I lost no time in sub- 
mitting the specimen to Mr. Lydekker, who replied : — “ The Ichthyosaurus 
paddle is indeed a prize. The contour of the fin is the same, so far as I can 
recollect, with that of a Continental specimen recently figured by Fraas.” And 
again : — “ On reading Fraas’ paper through, I find he describes similar striae in 
one of his specimens, and the same also occur in Owen’s example. Both writers 
consider that they are due to bundles of muscular fibres, and althongh I am still 
impressed with their remarkable resemblance to fin-rays, we must have decisive 
evidence before we can say they are such, and not muscular fibres. Prof. Flower 
was much interested in your specimen.” 
This example will be fully figured and described in a forthcoming number of 
the ‘ Gieological Magazine.’ One half is exhibited in the Leicester Museum, and 
the counterpart has been presented by the authorities to the British Museum. 
Ichthyosaurus (?) integer (Bronn). 
The British Museum possesses (33178) “Slab exhibiting the dorsal aspect of 
a medium-sized left pectoral limb, agreeing in general characters with the one 
noticed under the head of I. integer ; from the Lower Lias, probably of Barrow- 
on-Soar.” * 
Ichthyosaurus (?) zetlandiciis (Seeley). 
The British Museum possesses a large left coracoid (47420), probably belonging 
to this or to I. acutirostris (Owen) ; from the Upper Lias of the Vale of Belvoir.* 
SLENDEK-JAWED ICHTHYOSAURUS. Ichthyosaurus tenuirostris (Conybeare). 
The Museum contains a fine specimen, 9 feet in length, from the Lower 
Idas ('planorbis zone), Barrow-on-Soar ; and no doubt this is the identical specimen 
referred to by David Thomas Ansted, M.A., F.R.S., F.G.S., etc., in ‘ The Physical 
Geography and Geology of the County of Leicester,’ p. 56, who, after mentioning 
I. communis and intermedins possessed by the Museum, says, writing of tenui- 
rostris : — “ One of them, 9 feet in length, is the finest skeleton known ; the head 
is particularly remarkable; the sclerotic plates of the eye form a circle 18 inches 
in diameter.” This latter statement is, however, clearly an error, and for diameter 
we should read circumference, which would be about the measurement around 
the outer edge of the very perfect sclerotic plates of the Museum specimen. 
The Dublin Museum possesses two specimens, the largest 9 feet 2 inches in 
Lydekker, ‘ Catalogue of Fossil Iteptilia and Amphibia,' part ii. 
