1853.] SHARPE SANDS AND GRAVELS OF FARRINGDON. 181 



Besides the new species which are enumerated farther on, I have 

 found fragments of many others, too imperfect for me to venture to 

 describe. It is probable that most of these are new species, and that 

 farther search will show a long list of species peculiar to this deposit. 

 The principal additions will be to the families of Bryozoa and Mo- 

 nomyaria. 



The following are the principal results of an examination of the 

 stratigraphical affinities of the Farringdon fossils, considered in fami- 

 lies ; as is done in the above list. 



Sponges : 1 6 species ; many of them so abundant as to make up 

 a large part of the solid matter of the deposit ; most of these have 

 been found elsewhere in beds between the Upper green sand and the 

 Maestricht sand, both inclusive, those of the former bed largely pre- 

 dominating ; but several species appear peculiar to the deposit. 



Bryozoa : 44 have been identified with published descriptions of 

 species belonging to various beds from the Lower green sand to the 

 Maestricht sands ; but of these the larger part agree with those of 

 the Upper green sand and Upper chalk. There still remains a large 

 number of Bryozoa to be collected and worked out by more diligent 

 observers, many of which vnll probably prove to be undescribed. 



Corals : I have only met with two specimens of corals, one a frag- 

 ment of a Caryophyllia ? too imperfect to determine, the other an 

 Astreea, which may perhaps prove to be A. reticulata, Goldf. 



Brachiopoda : 1 9 species, all published ; the deposits, in which 

 the same species have been found, range from the Lower green sand 

 to the sands of Maestricht ; the two Lower green sand species, 

 T. oblonga and T. tamarindus, are very rare at Little Coxwell, while 

 those of the Upper green sand and Tourtia are both very numerous 

 and very abundant. 



Lamellibranchiata : the Dimyaria are veiy rare, and I met with 

 no specimen which I could name. Monomyaria numerous, and re- 

 ferable to species known in deposits ranging from the Lower green 

 sand to the Maestricht sands. 



Gasteropoda are very rare ; the only perfect specimen is of one 

 found in the Lower chalk 1 of Germany. 



Cephalopoda : there are two species of Nautilus found in Boutcher's 

 pit near Farringdon ; N. Icsvigatus, which ranges all through the 

 Chalk, is abundant ; the other is more rare, and is a new species, 

 which I have named N. Farringdonensis. 



The only Belemnites or Ammonites found are worn specimens 

 which have been wa&lied out of the oolitic beds. 



Serpulce are abundant and belong to several species, which cor- 

 respond with those from the Lower green sand to the Chalk. 



Echinodermata : Professor Forbes has kindly examined my speci- 

 mens, and refers 3 species to the Lower green sand ; besides which 

 there are fragments of 2 or 3 undetermined species of Cidaris, and 2 

 Nucleoli fes, probably of new species. 



The comparison of the families making up the fauna of the Far- 

 ringdon gravels with the organic contents of the various members of 

 the cretaceous series shows that their strongest affinity is to the 



