183 REPORT— 1866. 



I have prepared a Table wliich gives the species in detail, with theii- geo- 

 logical position and locality (it includes ten genera and seventy species*); 

 also representations of all the genera save three, which require further con- 

 firmation before they can be figured otherwise than as fragments. 



The geological range of this order is as follows : — We find there are 37 

 species in the Upper Silurian ; 7 in the Lower, and 8 in the Middle Devonian ; 

 1 in the Lower Carboniferous, and 7 in the Upper ; 1 in the Permian of Eussia ; 

 1 in the Trias of Germany ; 7 in the Lithographic stone of Solenhofen ; 1 in 

 the Tertiary Brown Coal of Saxony ; and -i living species inhabiting the shores 

 of Molucca, Japan, China, the East Indies, and the eastern shores of North 

 America. They have been met with geologically in the State of New York, 

 especially in Biifi'alo county ; in Ireland (Kiltorcan, fragments only) ; in For. 

 farshire, Lanarkshire, Fifeshire, and Caithness in Scotland; in Hereford- 

 shire, Worcestershire, and Stafi'ordshire ; in the islands of the Baltic (Oesel 

 and Gothland) ; in Bavaria, Saxony, Poland, and as far east as the govern- 

 ment of Pei-m and the Ural Mountains ; so that their geological distribution 

 is quite as wide as that of their living congeners. 



The Limuhis of the Upper White Jura cannot, so far as we are acquainted 

 mth it, be weU separated generically from those of the present day. How 

 vast, then, must have been the period represented between the lifetime of the 

 BeUnunis of the Coal-measures and that of the Limulus of the Oolites ! and 

 yet we should be unwilling to doubt their relationship by descent. Each an- 

 tecedent period, then, must have been infinitely greater as we recede to the 

 Wenlock, where the first traces of Pfenjgotus occur. 



Second Report on the " Menevian Group" and the other Formations at 

 St. David's, Pembrokeshire. By H. Hicks, and J. W. Salter. 

 F.G.S. 



Tnn work of the past year has not been confined to procuring fossil speci- 

 mens, although that object has been kept steadily in view. 



The extent and direction of the various beds has been particularly noted ; 

 and a much greater area than was formerly suspected has been found occu- 

 pied by the respective lower fossil groups Menevian, Ffestiniog, Tremadoc, 

 and the great Arenig or Skiddaw group — formations which have only of late 

 years been accurately explored. 



Above these rocks, and forming their upper limit, we have in the St. 

 David's promontory the Llandeilo flags, a formation that does not need a 

 special description, since it is already well known to us in the ' Silurian 

 System,' and under the name of Lower Bala in Prof. Sedgwick's works. 



The fossU-bearing strata in the neighbourhood of St. David's are mostly 

 exhibited in coast sections ; and the grant has been very useful in enabling 

 Dr. Hicks to employ boat-service in the work. Without boats, indeed, it 

 would be impossible to make sure of the succession, so much have the strata 

 been disturbed and faulted, and also in many parts covered by drift. But 

 the series, once accurately defined by this examination, could be tested by 

 reference to roadside and brook sections, where the beds are weathered ; and 

 hence we can now offer a tolerably accurate map of all the formations, and 

 extend it over a larger part of the district. Moreover in all about sixty-five 



* This Table ha:- since been published bv the Pala:ontographical Society, — Dec. 1866. 



