PROCEEDINGS OP GEOLOGICAL SOCIETIES. 
211 
to the Millepora-hcd; — equal to the zone of Am. Uumph-ieaianus. The fossils of 
these marine and freshwater beds were noted as existing in the cabinets of Leck- 
enby, Hean, and others. 
iMie zone of Am. Parl-lnaoni lias the following synonyms, according to the 
author : — " Trigonia-grit and Giyphite-grit," Murchison and Strickland ; " Rag- 
stone and Ciypeus-gvit," Hull; " Spinosa-stage," Lycett ; " Brauner Jura t" 
(pars), and " rarkinsonthone, Brauna Jura 5 und e " (pars), Quenstedt ; " Calcaire 
Polyijiers," Terquem ; " Die Schichteu des Ammonites Parkinsoni," Oppel. 
This zone is the most persistent of the three subdivisions C)f the Inferior Oolite, 
and is its only representative in the south-eastern parts of Gloucestershire. 
The sections ot Leckhampton Hill, Raveusgate Hill, Cold Comfort, Birdlip Hill, 
and Rodburough Hill afl'urd the fossils and details illustrative of this zone. 
In this communication Dr. Wright endeavoured to show that the Inferior Oolite 
of the South of England admits of a subdivision into three zones of life, and tliat 
each zone is characterised by the presence of Mollusca, Echinodermata, and Corals 
special to each. '2d. That these three zones are very luiequally develojied in dif- 
ferent regions both in England, France, and Germany ; the individual beds com- 
posing the zones being sometimes thin and feebly developed (or altogether absent) 
in some localities, but thick and fully developed in others; the zone of Am-Mur- 
chisoncB is the one most frequently absent ; that of A m. Humphnesianus has a 
wider area; and the zone oi Am. Parkinsoni is tlie most persistent, is widely ex- 
tended, and is very often the sole representative member of the Inferior Oolite 
formati on. 3d. That many Lamdliiranckiata and a few Gasteropoda are common 
to the three zones, and that most of the Ammonites, Btachiopoda, Echinodermata, 
and Corals are Umited in their range to one of the zones ; but that each zone pos- 
sesses a fiiuna which is sufficiently characteristic of it. 4th. The Parkinsoni-zone 
Possesses many si)ecies of Mollusca and Echinodermata in conmion with the Com- 
rash ; and the Murchisonaj-zone, in like manner, contains many Lamcllibran- 
chiata, which appeared for the first time in the Jurensis-stage, although all the 
Cephalopoda of these two stages are specifically distinct from each other. 
April 20th, 1859.— Major-General Portlock, V.F., in the chair. 
The following comnuuiications were read : — 
1. "On some Reptilian Remains from South Africa." By Professor Owen, 
F.R.S., F.G.S. 
Fam. Crocodilia. Galcsaurus planiceps, the Flat-headed Galesaur (from yuXTj, 
polecat, cavpos, lizard), a genus and species founded on an entire cranium and 
lower jaw. The skull in length less than twice the breadth, much depressed, and 
flat above. Occipital region sloping from above backward, divided by a high and 
shai-p ridge from the temporal foss?e, there wide and rhomboidal ; orbits small ; 
nostril single and terminal. Dentition, i c m j^-y^ ; all the teeth close- 
set, except the intervals for the crowns of the long canines when the mouth is 
closed ; canines of the shape and proportions of those in Mustela and Viverra, 
without trace of preparation of successors in the sockets ; of quite mammalian 
character. Incisors longish and slender, molars subcompressed, both with simple 
pointed crowns, of equal leii.gth, and undivided roots. Original transmitted by 
Governor Sir Geo. Gray, K.C.B. From tlie sandstone rocks, Rhenosterberg. 
Cynochampsa laniarius, the Dog-toothed Gavial (from Kvwy, dog, and x"f"f"'j 
Egyptian name for Crocodile, applied by Wagner to the Indian Gavial). This 
genus and sj)ecies is founded on the rostral end of the upper and lower jaws of a 
Crocodilian Reptile, with a single terminal nostril, situated and shajied as in 
Tcleosaurus, and indicating similarly long and slender jaws. Only the incisive and 
canine parts of the dentition are preserved ; but these closely correspond with the 
same parts in Galcsaurus, the incisors being equal and close-set, of simple conical 
form, and the canines suddenly contrasted by their large size. In shape they 
resemble closely the completely formed canines in Carnivorous Mammals. There 
is no trace of successional teeth. Original transmitted by Governor Sir Geo. 
Gray, K.C.B., from Rhenosterberg, South Africa. 
Fam. DiCYNODONTiA. Subgenus Ptychognathus, Ow. (tttuxos, ridge, -yvaeos, 
jaw.) —This subgenus is founded on four more or less entire skulls, two retaining 
the lower jaw, referable to two species. 
