1866.] 



DTIXCAX IXPKA-LIAS COEALS OF SOTJTH WALES. 



15 



Astrocasnia reptans, sp. nov. Astroc^enia costata, sp. nov. 



favoidea, sp.nov. gibbosa, sp. nov. 



■ spinigera, sp. nov. insignis, sp. nov. 



pedunculata, sp.nov. 



The following species were also found at Brocastle, bnt they have 

 been previously described : — 



Septastrgea excavata, de From. ThecosmiHa Martini, de From. 



Isasti'Eea Sinemuriensis, dJ' Orb., sp. Michelini, Tqra. 



Montlivakia poljmorpha, Terquem et 

 Piette. 



The annexed list includes the few species of Gasteropoda and 

 bivalve Mollusca I have recoo-nized in the Brocastle beds : — 



Ceritbium acuticostatum, Tq^n. 



gratiim, Tqm. 



Semele, dJ Orb. 



Turritella Zenkeni, BunJc., sp. 



Dunkei'i, Bunk., sp. 



Phasianella Morencyana, Piette. 

 Neintopsis exigua, Tqm. 

 Grervillia acuminata, Tqm. 

 Ostraa irregularis, Milnst. 



Ostrea Liassica, Str. (O. multicostata, 



Munst.) 



anomala, Tqrn,. 



Lima tuberculata. Tq^n. 



compressa, Tq/n. 



Cucullrea Psilonoti, Quenat. (C. Het- 



tangiensis, Tqrii.) 

 Cardita Heberti, Tqm. 



These lists contain a very remarkable assemblage of species ; and 

 the number of ^ladreporaria is very striking when it is remembered 

 how very few species of them have been found in any Liassic forma- 

 tion. The species, as a whole, constitute a coral-fauna not hitherto 

 recognized in Great Britain, and having a very decided distinction 

 from that of the Lias containing Ammonites BucMandi. The Gas- 

 teropoda associated with the ]y;adreporaria are noteworthy, because 

 they are grouped with some of the species of corals in those conti- 

 nental strata which appear to be the equivalents of the Brocastle 

 beds. 



3. RemarTcs upon tlie Palcmntology of the Sutton and Soutliern- 

 down series. — The general characteristics of the Sutton and Southern- 

 down series have been so ably described, that it is simply necessary 

 to refer to ]\Ir. Tawney's essay for their relative position and Htho- 

 logical peculiarities. The Sutton stone, with its supeiimposed 

 Southerndown beds, may be regarded as one Palseontological series. 

 Like the Brocastle beds it rests on Carboniferous Limestone, and is 

 conglomeratic at the base, where blocks of black chert containing 

 Palaeozoic corals of Carboniferous Limestone age are found. It is 

 best seen on the coast; but there are quarries of it at Laleston which 

 yield good fossils, and llr. Charles Moore states that it may be seen 

 beneath the Ewenny limestone. The Southerndown beds do not 

 contain many Madreporaria, and their species are the same as those 

 common in the Sutton stone. The uppermost beds of the Southern- 

 down series are covered with the Lias 

 BucMandi, A. Conyhearii, GrypJicea incurva, &c. 



