158 Mr. J. Lycett on the Upper Lias of Gloucestershire. 
Ammonites bifrons was the most conspicuous ; A. communis was 
in much smaller numbers; the few other Ammonites obtained 
consisted of A. falcifer, A. heterophyllus, A. cornucopia, A. cras- 
sus, A. Lythensis, A. Jurensis, and a new species near to A. 
Humphriesianus ; a few fragments occurred apparently of Nau- 
tilus sinuatus, and a single specimen of N. latidorsatus. Belem- 
nites were comparatively few, as were also Gasteropoda and Con- 
chifera; the latter included two undescribed species, one of 
Tancredia and one of Placunopsis. 
In the lower beds bluish-grey clays predominated; but the 
sections were insufficient to expose an unbroken sequence of the 
lower beds, although the entire thickness of the stage was ascer- 
tained with a near approach to accuracy ; the measurement gave 
a thickness of 105 feet, the beds being free from disturbance. 
Some few layers of limestone nodules occurred, but their amount 
was not comparable with those obtained from the Upper Lias of 
Somersetshire. To the same general deficiency of lime, as 
exemplified in the paucity and thinness of the limestone bands, 
may probably be attributed the general scarcity of fossils when 
compared with the Upper Lias of Somerset ; here the chief mass 
of the deposit consisted of brown and blue clays which were 
quite destitute of fossils; no remains of Saurians or of Fishes 
were observed. These conditions present a remarkable contrast 
to the same stage at Ilminster, with its pale yellow limestone 
charged with Saurians, Fishes, and a multitude of Mollusca of 
all classes, numbering probably more than 150 species, notwith- 
standing that the entire thickness of the stage is only a few feet 
at that place. To study these, the extensive collection of Mr. 
Moore, in the Bath Museum, should be visited. 
The occurrence at Nailsworth of finely laminated shales with 
the little Posidonia Bronnit in the upper portion is interesting, 
as identifying the stratum with the continental representative of 
the same shale: this fragile bivalve appears to be limited to the 
single stratum indicated. 
The large Tancredia is the first recorded example in the Lias 
of England, although upwards of eleven species are distributed 
throughout our Lower and Upper Oolites ; in France and Ger- 
many, on the other hand, nearly all the recorded species are 
Liassic. It is probable, however, that some, or even all of the 
shells referred to Tellina in the “ Etage Bathonien” of D’Orbigny 
belong to the genus Tancredia, excluding the two species in his 
“« tage Bajocien,” which belong to the genus Quenstediia. 
The following is the limited list of Upper Lias Testacea pro- 
cured at Nailsworth :— 
